Electrophoresis as a tool for estimating levels of hymenopterous parasitism in field populations of the cereal aphid, Sitobion avenae .

Walton, M. P., Powell, W., Loxdale, H. D. and Allen-Williams, L. J. 1990. Electrophoresis as a tool for estimating levels of hymenopterous parasitism in field populations of the cereal aphid, Sitobion avenae . Entomologia Experimentalis et Applicata. 54 (3), pp. 271-279.

Related outputs

Migratory flight behaviour of the pollen beetle Meligethes aeneus

A - Papers appearing in refereed journals

Mauchline, A. L., Cook, S. M., Powell, W., Chapman, J. W. and Osborne, J. L. 2017. Migratory flight behaviour of the pollen beetle Meligethes aeneus. Pest Management Science. 73 (6), pp. 1076-1082. https://doi.org/10.1002/ps.4550

Field evaluation of synthetic aphid sex pheromone in enhancing suppression of aphid abundance by their natural enemies

A - Papers appearing in refereed journals

Nakashima, Y., Ida, T. Y., Powell, W., Pickett, J. A., Birkett, M. A., Taki, H. and Takabayashi, J. 2016. Field evaluation of synthetic aphid sex pheromone in enhancing suppression of aphid abundance by their natural enemies. BioControl. 61 (5), pp. 485-496. https://doi.org/10.1007/s10526-016-9734-3

Flight of Meligethes aeneus at a range of altitudes

C1 - Edited contributions to conferences/learned societies

Mauchline, A. L., Cook, S. M., Powell, W., Chapman, J. W. and Osborne, J. L. 2014. Flight of Meligethes aeneus at a range of altitudes. IOBC.

Effects of non-host plant odour on Melingethes aeneus during immigration to oilseed rape

A - Papers appearing in refereed journals

Mauchline, A. L., Cook, S. M., Powell, W. and Osborne, J. L. 2013. Effects of non-host plant odour on Melingethes aeneus during immigration to oilseed rape. Entomologia Experimentalis et Applicata. 146 (3), pp. 313-320. https://doi.org/10.1111/eea.12030

Odour-mediated orientation behaviour of the lily beetle Lilioceris lilii

A - Papers appearing in refereed journals

Salisbury, A., Cook, S. M., Powell, W. and Hardie, J. 2012. Odour-mediated orientation behaviour of the lily beetle Lilioceris lilii. Physiological Entomology. 37 (1), pp. 97-102. https://doi.org/10.1111/j.1365-3032.2011.00823.x

Two-step learning involved in acquiring olfactory preferences for plant volatiles by parasitic wasps

A - Papers appearing in refereed journals

Takemoto, H., Powell, W., Pickett, J. A., Kainoh, Y. and Takabayashi, J. 2012. Two-step learning involved in acquiring olfactory preferences for plant volatiles by parasitic wasps. Animal Behaviour. 83, pp. 1491-1496. https://doi.org/10.1016/j.anbehav.2012.03.023

Fitness trade-off in peach-potato aphids (Myzus persicae) between insecticide resistance and vulnerability to parasitoid attack at several spatial scales

A - Papers appearing in refereed journals

Foster, S. P., Denholm, I., Poppy, G. M., Thompson, R. and Powell, W. 2011. Fitness trade-off in peach-potato aphids (Myzus persicae) between insecticide resistance and vulnerability to parasitoid attack at several spatial scales. Bulletin of Entomological Research. 101 (6), pp. 659-666. https://doi.org/10.1017/S0007485310000623

Susceptibility of six Lilium to damage by the lily beetle, Lilioceris lilii (Coleoptera: Chrysomelidae)

A - Papers appearing in refereed journals

Salisbury, A., Clark, S. J., Powell, W. and Hardie, J. 2010. Susceptibility of six Lilium to damage by the lily beetle, Lilioceris lilii (Coleoptera: Chrysomelidae). Annals of Applied Biology - AAB. 156 (1), pp. 103-110. https://doi.org/10.1111/j.1744-7348.2009.00368.x

Learning is involved in the response of parasitic wasps Aphidius ervi (Haliday) (Hymenoptera: Braconidae) to volatiles from a broad bean plant, Vicia faba (Fabaceae), infested by aphids Acyrthosiphon pisum (Harris) (Homoptera: Aphididae)

A - Papers appearing in refereed journals

Takemoto, H., Powell, W., Pickett, J. A., Kainoh, Y. and Takabayashi, J. 2009. Learning is involved in the response of parasitic wasps Aphidius ervi (Haliday) (Hymenoptera: Braconidae) to volatiles from a broad bean plant, Vicia faba (Fabaceae), infested by aphids Acyrthosiphon pisum (Harris) (Homoptera: Aphididae). Applied Entomology and Zoology. 44, pp. 23-28. https://doi.org/10.1303/aez.2009.23

Electrophysiological and behavioural responses of the pollen beetle, Meligethes aeneus , to volatiles from a non-host plant, lavender, Lavandula angustifolia (Lamiaceae)

A - Papers appearing in refereed journals

Mauchline, A. L., Birkett, M. A., Woodcock, C. M., Pickett, J. A., Osborne, J. L. and Powell, W. 2008. Electrophysiological and behavioural responses of the pollen beetle, Meligethes aeneus , to volatiles from a non-host plant, lavender, Lavandula angustifolia (Lamiaceae). Arthropod-Plant Interactions. 2, pp. 109-115. https://doi.org/10.1007/s11829-008-9038-3

Aggregation of parasitism risk in an aphid-parasitoid system: effects of plant patch size and aphid density

A - Papers appearing in refereed journals

Pareja, M., Brown, V. K. and Powell, W. 2008. Aggregation of parasitism risk in an aphid-parasitoid system: effects of plant patch size and aphid density. Basic and Applied Ecology. 9, pp. 701-708. https://doi.org/10.1016/j.baae.2007.10.008

Endoparasitism in cereal aphids: molecular analysis of a whole parasitoid community

A - Papers appearing in refereed journals

Traugott, M., Bell, J. R., Broad, G. R., Powell, W., Van Veen, F. J. F., Vollhardt, I. M. G. and Symondson, W. O. C. 2008. Endoparasitism in cereal aphids: molecular analysis of a whole parasitoid community. Molecular Ecology. 17 (17), pp. 3928-3938. https://doi.org/10.1111/j.1365-294X.2008.03878.x

Effect of the presence of a nonhost herbivore on the response of the aphid parasitoid Diaeretiella rapae to host-infested cabbage plants

A - Papers appearing in refereed journals

Agbogba, B. C. and Powell, W. 2007. Effect of the presence of a nonhost herbivore on the response of the aphid parasitoid Diaeretiella rapae to host-infested cabbage plants. Journal of Chemical Ecology. 33, pp. 2229-2235. https://doi.org/10.1007/s10886-007-9379-x

Foraging behaviour of the parasitoid Lysiphlebus testaceipes (Hymenoptera: Braconidae) in response to plant volatiles, with reference to biocontrol of aphids in peri-urban vegetable production systems

A - Papers appearing in refereed journals

Lopez Perez, M., Fernandez Argudin, M. and Powell, W. 2007. Foraging behaviour of the parasitoid Lysiphlebus testaceipes (Hymenoptera: Braconidae) in response to plant volatiles, with reference to biocontrol of aphids in peri-urban vegetable production systems. Biocontrol Science and Technology. 17, pp. 677-686. https://doi.org/10.1080/09583150701408949

Behavioural side-effects of insecticide resistance in aphids increase their vulnerability to parasitoid attack

A - Papers appearing in refereed journals

Foster, S. P., Tomiczek, M., Thompson, R., Denholm, I., Poppy, G. M., Kraaijeveld, A. R. and Powell, W. 2007. Behavioural side-effects of insecticide resistance in aphids increase their vulnerability to parasitoid attack. Animal Behaviour. 74 (3), pp. 621-632. https://doi.org/10.1016/j.anbehav.2006.12.018

Responses of Phradis parasitoids to volatiles of lavender, Lavendula angustifolia - a possible repellent for their host, Meligethes aeneus

A - Papers appearing in refereed journals

Cook, S. M., Jonsson, M., Skellern, M. P., Murray, D. A., Anderson, P. and Powell, W. 2007. Responses of Phradis parasitoids to volatiles of lavender, Lavendula angustifolia - a possible repellent for their host, Meligethes aeneus. BioControl. 52, pp. 591-598. https://doi.org/10.1007/s10526-006-9057-x

Response of the aphid parasitoid Aphidius funebris to volatiles from undamaged and aphid-infested Centaurea nigra

A - Papers appearing in refereed journals

Pareja, M., Moraes, M. C. B., Clark, S. J., Birkett, M. A. and Powell, W. 2007. Response of the aphid parasitoid Aphidius funebris to volatiles from undamaged and aphid-infested Centaurea nigra. Journal of Chemical Ecology. 33 (April), pp. 695-710. https://doi.org/10.1007/s10886-007-9260-y

Functional biodiversity of aphid natural enemies: positive intra-guild interactions

C1 - Edited contributions to conferences/learned societies

Powell, W., Pell, J. K., Nakashima, Y., Baverstock, J. and Birkett, M. A. 2006. Functional biodiversity of aphid natural enemies: positive intra-guild interactions.

Chemically mediated intraguild predator avoidance by aphid parasitoids: interspecific variability in sensitivity to semiochemical trails of ladybird predators

A - Papers appearing in refereed journals

Nakashima, Y., Birkett, M. A., Pye, B. J. and Powell, W. 2006. Chemically mediated intraguild predator avoidance by aphid parasitoids: interspecific variability in sensitivity to semiochemical trails of ladybird predators. Journal of Chemical Ecology. 32, pp. 1989-1998. https://doi.org/10.1007/s10886-006-9123-y

Avoidance of intraguild predators by parasitoids: chemical mechanisms, behaviour and field evaluation

C1 - Edited contributions to conferences/learned societies

Nakashima, Y., Birkett, M. A. and Powell, W. 2005. Avoidance of intraguild predators by parasitoids: chemical mechanisms, behaviour and field evaluation. Proceedings International Symposium on Biological Control of Aphids and Coccids, Tsuruoka, Japan, 25-29 September 2005 .

The behavioural responses of the pollen beetle (Meligethes aeneus )to floral colours and odours: designing a 'push-pull' pest management strategy

C2 - Non-edited contributions to conferences

Cook, S. M., Rasmussen, H. B., Skellern, M. P., Watts, N. P., Williams, I. H. and Powell, W. 2005. The behavioural responses of the pollen beetle (Meligethes aeneus )to floral colours and odours: designing a 'push-pull' pest management strategy. Abstracts Entomology 2005, Brighton, 12-14 September 2005 . pp. 27

The effects of non-host plant essential oil volatiles on the behaviour of the pollen beetle Meligethes aeneus

A - Papers appearing in refereed journals

Mauchline, A. L., Osborne, J. L., Martin, A. P., Poppy, G. M. and Powell, W. 2005. The effects of non-host plant essential oil volatiles on the behaviour of the pollen beetle Meligethes aeneus. Entomologia Experimentalis et Applicata. 114 (3), pp. 181-188. https://doi.org/10.1111/j.1570-7458.2005.00237.x

Insect behavioural ecology and other factors affecting the control efficacy of agro-ecosystem diversification strategies

A - Papers appearing in refereed journals

Potting, R. P. J., Perry, J. N. and Powell, W. 2005. Insect behavioural ecology and other factors affecting the control efficacy of agro-ecosystem diversification strategies. Ecological Modelling. 182, pp. 199-216.

Reduced response of insecticide-resistant aphids and attraction of parasitoids to aphid alarm pheromone; a potential fitness trade-off

A - Papers appearing in refereed journals

Foster, S. P., Denholm, I., Thompson, R., Poppy, G. M. and Powell, W. 2005. Reduced response of insecticide-resistant aphids and attraction of parasitoids to aphid alarm pheromone; a potential fitness trade-off. Bulletin of Entomological Research. 95 (1), pp. 37-46. https://doi.org/10.1079/BER2004336

Parasitoid impact on aphid populations in UK cereal crops and attempts at manipulation

C2 - Non-edited contributions to conferences

Powell, W. 2004. Parasitoid impact on aphid populations in UK cereal crops and attempts at manipulation. Abstracts Strength in Diversity: 22nd International Congress of Entomology, Brisbane, 15-21 August 2004 .

Pushing insects around: the use of 'push-pull' strategies in integrated pest management

C2 - Non-edited contributions to conferences

Cook, S. M., Powell, W., Smart, L. E., Watts, N. P. and Williams, I. H. 2004. Pushing insects around: the use of 'push-pull' strategies in integrated pest management. Abstracts Strength in Diversity: 22nd International Congress of Entomology, Brisbane, 15-21 August 2004 .

Pleiotropic effects of insecticide resistance genes in an aphid pest on vulnerability to attack by parasitoid wasps

C2 - Non-edited contributions to conferences

Foster, S. P., Denholm, I. and Powell, W. 2004. Pleiotropic effects of insecticide resistance genes in an aphid pest on vulnerability to attack by parasitoid wasps. Abstracts Strength in Diversity: 22nd International Congress of Entomology, Brisbane, 15-21 August 2004 .

The role of semiochemicals in the avoidance of the seven-spot ladybird, Coccinella septempunctata , by the aphid parasitoid, Aphidius ervi

A - Papers appearing in refereed journals

Nakashima, Y., Birkett, M. A., Pye, B. J., Pickett, J. A. and Powell, W. 2004. The role of semiochemicals in the avoidance of the seven-spot ladybird, Coccinella septempunctata , by the aphid parasitoid, Aphidius ervi. Journal of Chemical Ecology. 30, pp. 1103-1116.

Genetic manipulation of natural enemies: can we improve biological control by manipulating the parasitoid and/or the plant?

B - Book chapters etc edited externally

Poppy, G. M. and Powell, W. 2004. Genetic manipulation of natural enemies: can we improve biological control by manipulating the parasitoid and/or the plant? in: Mateille, T., Ehler, L. E. and Sforza, R. (ed.) Genetics, evolution and biological control CABI International, Wallingford, Oxon (CABI). pp. 219-233

Feeding responses of carabid beetles to dimethoate- contaminated prey

A - Papers appearing in refereed journals

Mauchline, A. L., Osborne, J. L. and Powell, W. 2004. Feeding responses of carabid beetles to dimethoate- contaminated prey. Agricultural and Forest Entomology. 6 (2), pp. 99-104. https://doi.org/10.1111/j.1461-9563.2004.00208.x

Using field margin diversification in agri-environment schemes to enhance aphid natural enemies

C1 - Edited contributions to conferences/learned societies

Powell, W., Walters, K., A'hara, S., Ashby, J., Stevenson, H. and Northing, P. 2003. Using field margin diversification in agri-environment schemes to enhance aphid natural enemies.

Determination of plant foraging preferences in the aphid parasitoid Aphidius colemani : emergence conditioning, learning and memory

C2 - Non-edited contributions to conferences

Powell, W., Storeck, A., Poppy, G. M. and Van Emden, H. 2003. Determination of plant foraging preferences in the aphid parasitoid Aphidius colemani : emergence conditioning, learning and memory. Oxford Univ Press Inc.

Avoidance of intraguild predators by parasitoids: chemically mediated behavioural mechanisms and field evaluation

C2 - Non-edited contributions to conferences

Nakashima, Y., Birkett, M. A. and Powell, W. 2003. Avoidance of intraguild predators by parasitoids: chemically mediated behavioural mechanisms and field evaluation. Oxford University Press (OUP) Oxford. https://doi.org/10.1093/jis/3.1.33

Manipulation of parasitoids for aphid pest management: progress and prospects

A - Papers appearing in refereed journals

Powell, W. and Pickett, J. A. 2003. Manipulation of parasitoids for aphid pest management: progress and prospects. Pest Management Science. 59 (2), pp. 149-155. https://doi.org/10.1002/ps.550

Plant-to-plant communication mediating in-flight orientation of Aphidius ervi

A - Papers appearing in refereed journals

Guerrieri, E., Poppy, G. M., Powell, W., Rao, R. and Pennacchio, F. 2002. Plant-to-plant communication mediating in-flight orientation of Aphidius ervi. Journal of Chemical Ecology. 28, pp. 1703-1715.

Possibilities and constraints of agro-ecosystem diversification as a pest management strategy: a simulation approach

C1 - Edited contributions to conferences/learned societies

Potting, R. P. J., Perry, J. N. and Powell, W. 2002. Possibilities and constraints of agro-ecosystem diversification as a pest management strategy: a simulation approach. Proceedings Brighton Crop Protection Conference - Pests and Diseases, 2002 . pp. 91-96

Sub-lethal effects of the insecticides pirimicarb and dimethoate on the aphid parasitoid Diaeretiella rapae (Hymenoptera: Braconidae) when attacking and developing in insecticide-resistant hosts

A - Papers appearing in refereed journals

Umoru, P. A. and Powell, W. 2002. Sub-lethal effects of the insecticides pirimicarb and dimethoate on the aphid parasitoid Diaeretiella rapae (Hymenoptera: Braconidae) when attacking and developing in insecticide-resistant hosts. Biocontrol Science and Technology. 12, pp. 605-614.

Parasitoid interactions between crop and margin habitat

C2 - Non-edited contributions to conferences

Powell, W. 2002. Parasitoid interactions between crop and margin habitat. Abstracts 7th European Congress of Entomology, Thessaloniki, 7-13 October 2002 . pp. 61

Identification of non-host plant volatiles repellent to pollen beetles

C2 - Non-edited contributions to conferences

Stevenson, A. L., Birkett, M. A., Woodcock, C. M., Pickett, J. A., Osborne, J. L. and Powell, W. 2002. Identification of non-host plant volatiles repellent to pollen beetles. Abstracts 19th Annual Meeting of the International Society of Chemical Ecology, Hamburg, 3-8 August 2002 .

Can aphid-induced plant signals be transmitted aerially and through the rhizosphere?

A - Papers appearing in refereed journals

Chamberlain, K., Guerrieri, E., Pennacchio, F., Pettersson, J., Pickett, J. A., Poppy, G. M., Powell, W., Wadhams, L. J. and Woodcock, C. M. 2001. Can aphid-induced plant signals be transmitted aerially and through the rhizosphere? Biochemical Systematics And Ecology. 29, pp. 1063-1074.

Comparison of two field-scale approaches for the study of effects of insecticides on polyphagous predators in cereals

A - Papers appearing in refereed journals

Kennedy, P. J., Conrad, K. F., Perry, J. N., Powell, D., Aegerter, J., Todd, A. D., Walters, K. F. A. and Powell, W. 2001. Comparison of two field-scale approaches for the study of effects of insecticides on polyphagous predators in cereals. Applied Soil Ecology. 17 (3), pp. 253-266. https://doi.org/10.1016/S0929-1393(01)00142-1

Repellency of non-host plants to oilseed rape pests

C2 - Non-edited contributions to conferences

Stevenson, A. L., Osborne, J. L. and Powell, W. 2001. Repellency of non-host plants to oilseed rape pests. Abstracts British Ecological Society Winter Meeting, Birmingham, 3-5 January 2001 . pp. 56

A simple sequence repeat-based linkage map of barley

A - Papers appearing in refereed journals

Ramsay, L., Macaulay, M., Degli Ivanissevich, S., Maclean, K., Cardle, L., Fuller, J., Edwards, K. J., Tuvesson, S., Morgante, M., Massari, A., Maestri, E., Marmiroli, N., Sjakste, T., Ganal, M., Powell, W. and Waugh, R. 2000. A simple sequence repeat-based linkage map of barley. Genetics. 156, pp. 1997-2005.

The use of field margins in the manipulation of parasitoids for aphid control in arable crops

C1 - Edited contributions to conferences/learned societies

Powell, W. 2000. The use of field margins in the manipulation of parasitoids for aphid control in arable crops. Proceedings Brighton Crop Protection Conference - Pests and Diseases, 2000 . pp. 579-584

Aphid-induced plant volatiles influencing parasitoid behaviour

C2 - Non-edited contributions to conferences

Poppy, G. M., Powell, W., Guerrieri, E. and Pennacchio, F. 2000. Aphid-induced plant volatiles influencing parasitoid behaviour. Abstract Book 1: 21st International Congress of Entomology, Foz do Iguassu, Brazil, 20-26 August 2000 .

Host selection strategies by the aphid parasitoid Aphidius ervi

C2 - Non-edited contributions to conferences

Pennacchio, F., Battaglia, D., Guerrieri, E., Poppy, G. M., Powell, W., Romano, A. and Tranfaglia, A. 2000. Host selection strategies by the aphid parasitoid Aphidius ervi. Abstracts Book 1: 21st International Congress of Entomology, Foz do Iguassu, Brazil, 20-26 August 2000 .

Principles for regulatory testing and interpretation of semi-field and field studies with non-target arthropods

A - Papers appearing in refereed journals

Candolfi, M., Bigler, F., Campbell, P., Heimbach, U., Schmuck, R., Angeli, G., Bakker, F., Brown, K., Carli, G., Dinter, A., Forti, D., Forster, R., Gathmann, A., Hassan, S., Mead-Briggs, M., Melandri, M., Neuwmann, P., Pasqualini, E., Powell, W., Reboulet, J-N., Romijn, K., Sechser, B., Thieme, Ufer, A., Vergnet, Ch. and Vogt, H. 2000. Principles for regulatory testing and interpretation of semi-field and field studies with non-target arthropods. Anzeiger fur Schadlingskunde/Journal of Pest Science. 73 (6), pp. 141-147.

Movement of aphid parasitoids over different spatial scales studied using molecular markers

C2 - Non-edited contributions to conferences

Loxdale, H. D., Brookes, C. P. and Powell, W. 2000. Movement of aphid parasitoids over different spatial scales studied using molecular markers. Abstracts 21st International Congress of Entomology, Foz de Iguassu, Brazil, 20-26 August 2000 . pp. 2

Fitting host-parasitoid models with CV2>1 using hierarchical generalized linear models

A - Papers appearing in refereed journals

Perry, J. N., Noh, M. S., Lee, Youngsook, Alston, R. D., Mohd Norowi, H., Powell, W. and Rennolls, K. 2000. Fitting host-parasitoid models with CV2>1 using hierarchical generalized linear models. Proceedings of the Royal Society of London Series B Biological Sciences. 267, pp. 2043-2048.

Physical and chemical cues influencing the oviposition behaviour of Aphidius ervi

A - Papers appearing in refereed journals

Battaglia, D., Poppy, G. M., Powell, W., Romano, A., Tranfaglia, A. and Pennacchio, F. 2000. Physical and chemical cues influencing the oviposition behaviour of Aphidius ervi. Entomologia Experimentalis et Applicata. 94 (3), pp. 219-227. https://doi.org/10.1046/j.1570-7458.2000.00623.x

The role of plant chemical cues in determining host preference in the generalist aphid parasitoid Aphidius colemani

A - Papers appearing in refereed journals

Storeck, A., Poppy, G. M., Van Emden, H. F. and Powell, W. 2000. The role of plant chemical cues in determining host preference in the generalist aphid parasitoid Aphidius colemani. Entomologia Experimentalis et Applicata. 97 (1), pp. 41-46. https://doi.org/10.1046/j.1570-7458.2000.00714.x

The effect of spatial scale on interactions between two weevils and their parasitoid

A - Papers appearing in refereed journals

Mohd Norowi, Hamid, Perry, J. N., Powell, W. and Rennolls, K. 2000. The effect of spatial scale on interactions between two weevils and their parasitoid. Ecological Entomology. 25 (2), pp. 188-196. https://doi.org/10.1046/j.1365-2311.2000.00242.x

Parasitoid hosts

B - Book chapters etc edited externally

Powell, W. 1999. Parasitoid hosts. in: Hardie, J. and Minks, A. K. (ed.) Pheromones of non-lepidopteran insects associated with agricultural plants Wallingford, Oxon CAB International (CABI). pp. 405-427

Aphid-induced plant volatiles and the specific attraction of aphid parasitoids

C2 - Non-edited contributions to conferences

Poppy, G. M. and Powell, W. 1999. Aphid-induced plant volatiles and the specific attraction of aphid parasitoids. Abstracts 14th International Plant Protection Congress, Jerusalem, July 1999 .

Induction and systemic release of herbivore-induced plant volatiles mediating in-flight orientation of Aphidius ervi

A - Papers appearing in refereed journals

Guerrieri, E., Poppy, G. M., Powell, W., Tremblay, E. and Pennacchio, F. 1999. Induction and systemic release of herbivore-induced plant volatiles mediating in-flight orientation of Aphidius ervi. Journal of Chemical Ecology. 25, pp. 1247-1261.

Responses to aphid sex pheromones by the pea aphid parasitoids Aphidius ervi and Aphidius eadyi

A - Papers appearing in refereed journals

Glinwood, R. T., Du, Y-J. and Powell, W. 1999. Responses to aphid sex pheromones by the pea aphid parasitoids Aphidius ervi and Aphidius eadyi. Entomologia Experimentalis et Applicata. 92 (2), pp. 227-232. https://doi.org/10.1046/j.1570-7458.1999.00541.x

The effect of spatial scale on interactions between two weevils and their food plant

A - Papers appearing in refereed journals

Hamid, Mohd Norowi, Perry, J. N., Powell, W. and Rennolls, K. 1999. The effect of spatial scale on interactions between two weevils and their food plant. Acta Oecologica - International journal of ecology. 20, pp. 537-549.

Aphids, predators and parasitoids

C1 - Edited contributions to conferences/learned societies

Wadhams, L. J., Birkett, M. A., Powell, W. and Woodcock, C. M. 1999. Aphids, predators and parasitoids. Goode, J. A. and Chadwick, D. J. (ed.) Insect-plant Interactions and Induced Plant Defence. Novartis Foundation Symposium 223 . John Wiley & Sons Chichester, West Sussex. pp. 60-73

Comparative responses of parasitoids to synthetic and plant-extracted nepetalactone component of aphid sex pheromones

A - Papers appearing in refereed journals

Glinwood, R. T., Du, Y-J., Smiley, D. W. M. and Powell, W. 1999. Comparative responses of parasitoids to synthetic and plant-extracted nepetalactone component of aphid sex pheromones. Journal of Chemical Ecology. 25, pp. 1481-1488.

Spatial aspects in modelling pest-crop interactions

C1 - Edited contributions to conferences/learned societies

Mohd Norowi, H., Perry, J. N., Powell, W. and Rennolls, K. 1999. Spatial aspects in modelling pest-crop interactions. Proceedings 5th International Conference on Plant Protection in the Tropics, Kuala Lumpur, 15-18 March 1999 . Malaysian Plant Protection Society, Kuala Lumpur, Malaysia. pp. 29-34

Aphid sex pheromones: manipulation of beneficial insects for aphid population control

C1 - Edited contributions to conferences/learned societies

Glinwood, R. T., Smiley, D. W. M., Hardie, J., Pickett, J. A., Powell, W., Wadhams, L. J. and Woodcock, C. M. 1999. Aphid sex pheromones: manipulation of beneficial insects for aphid population control. Wiley.

Aphid sex pheromones: manipulation of beneficial insects for aphid population control

C2 - Non-edited contributions to conferences

Glinwood, R., Smiley, D. W. M., Hardie, J., Pickett, J. A., Powell, W., Wadhams, L. J. and Woodcock, C. M. 1998. Aphid sex pheromones: manipulation of beneficial insects for aphid population control. Abstracts 9th International Congress on Pesticide Chemistry: the Food-Environment Challenge, London, 2-7 August 1998 . pp. 3D-002

Assessment of risks posed by pesticides to non-target arthropods

C2 - Non-edited contributions to conferences

Birnie, L. C., Kennedy, P. J., Shaw, K. E., Denholm, I., Perry, J. N. and Powell, W. 1998. Assessment of risks posed by pesticides to non-target arthropods. Abstracts 9th International Congress on Pesticide Chemistry: the Food-Environment Challenge, London, 2-7 August 1998 . pp. 8B-025

Pest control by a community of natural enemies

C1 - Edited contributions to conferences/learned societies

Sunderland, K. D., Axelsen, J. A., Dromph, K., Freier, B., Hemptinne, J-L., Holst, N. H., Mols, P. J. M., Petersen, M. K., Powell, W., Ruggle, P., Triltsch, H. and Winder, L. 1998. Pest control by a community of natural enemies.

The complementary roles of laboratory and field testing in ecotoxicological risk assessment

C1 - Edited contributions to conferences/learned societies

Denholm, I., Birnie, L. C., Kennedy, P. J., Shaw, K. E., Perry, J. N. and Powell, W. 1998. The complementary roles of laboratory and field testing in ecotoxicological risk assessment. Proceedings Brighton Crop Protection Conference - Pests and Diseases, 1998 . pp. 583-590

Direct and indirect effects of transgenic potatoes expressing the snowdrop lectin (GNA) on the aphid parasitoid, Aphidius ervi

C2 - Non-edited contributions to conferences

Couty, A., Poppy, G. M., Powell, W. and Gatehouse, A. M. R. 1998. Direct and indirect effects of transgenic potatoes expressing the snowdrop lectin (GNA) on the aphid parasitoid, Aphidius ervi. Abstracts 10th International Symposium on Insect-Plant Relationships, Oxford, 4-11 July 1998 . pp. 55

Aphid sex pheromones to enhance parasitoid efficiency (Home-Grown Cereals Authority Project Report No. 155)

D1 - Technical reports: non-confidential

Powell, W. and Glinwood, R. T. 1998. Aphid sex pheromones to enhance parasitoid efficiency (Home-Grown Cereals Authority Project Report No. 155). H-GCA, London.

Semiochemicals to increase parasitism in aphid pest control

C1 - Edited contributions to conferences/learned societies

Powell, W. 1998. Semiochemicals to increase parasitism in aphid pest control. Wiley. https://doi.org/10.1002/(SICI)1096-9063(1998110)54:3<291::AID-PS804>3.0.CO;2-9

Increased parasitization of aphids on trap plants alongside vials releasing synthetic aphid sex pheromone and effective range of the pheromone

A - Papers appearing in refereed journals

Glinwood, R. T., Powell, W. and Tripathi, C. P. M. 1998. Increased parasitization of aphids on trap plants alongside vials releasing synthetic aphid sex pheromone and effective range of the pheromone. Biocontrol Science and Technology. 8 (4), pp. 607-614. https://doi.org/10.1080/09583159830126

Identification of semiochemicals released during aphid feeding that attract parasitoid Aphidius ervi

A - Papers appearing in refereed journals

Du, Y., Poppy, G. M., Powell, W., Pickett, J. A., Wadhams, L. J. and Woodcock, C. M. 1998. Identification of semiochemicals released during aphid feeding that attract parasitoid Aphidius ervi. Journal of Chemical Ecology. 24, pp. 1355-1368.

Strategies involved in the location of hosts by the parasitoid Aphidius ervi Haliday (Hymenoptera: Braconidae: Aphidiinae)

A - Papers appearing in refereed journals

Powell, W., Pennacchio, F., Poppy, G. M. and Tremblay, E. 1998. Strategies involved in the location of hosts by the parasitoid Aphidius ervi Haliday (Hymenoptera: Braconidae: Aphidiinae). Biological Control. 11, pp. 104-112.

Electrophoretic study of five aphid parasitoid species of the genus Aphidius (Hymenoptera: Braconidae), including evidence for reproductively isolated sympatric populations and a cryptic species

A - Papers appearing in refereed journals

Atanassova, P., Brookes, C. P., Loxdale, H. D. and Powell, W. 1998. Electrophoretic study of five aphid parasitoid species of the genus Aphidius (Hymenoptera: Braconidae), including evidence for reproductively isolated sympatric populations and a cryptic species. Bulletin of Entomological Research. 88 (1), pp. 3-13. https://doi.org/10.1017/S000748530004150X

The use of single-species spatially explicit models

C1 - Edited contributions to conferences/learned societies

Topping, C. J., Booij, K., Daamen, R. A., Dinter, A., Heimbach, U., Kennedy, P. J., Langer, V., Perry, J. N., Powell, W., Skirvin, D., Stilmant, D., Thomas, C. F. G. and Winstone, L. 1997. The use of single-species spatially explicit models.

Herbivore-induced synomones regulating the flight behaviour of the aphid parasitoid Aphidius ervi (Hymenoptera: Braconidae)

C2 - Non-edited contributions to conferences

Poppy, G. M., Guerrieri, E., Powell, W., Pennacchio, F. and Tremblay, E. 1997. Herbivore-induced synomones regulating the flight behaviour of the aphid parasitoid Aphidius ervi (Hymenoptera: Braconidae). Abstracts 6th European Workshop on Insect Parasitoids, Valencia, March 1997 .

Aphid-induced plant synomones affecting the foraging behaviour of the parasitoid Aphidius ervi

C2 - Non-edited contributions to conferences

Poppy, G. M., Guerrieri, E., Powell, W. and Pennacchio, F. 1997. Aphid-induced plant synomones affecting the foraging behaviour of the parasitoid Aphidius ervi. Abstracts Entomology '97, Newcastle, 10-12 September 1997 .

Physical and chemical cues regulating the oviposition behaviour of Aphidius ervi Haliday (Hymenoptera: Braconidae)

C2 - Non-edited contributions to conferences

Battaglia, D., Pennacchio, F., Poppy, G. M., Powell, W., Romano, A. and Tranfaglia, A. 1997. Physical and chemical cues regulating the oviposition behaviour of Aphidius ervi Haliday (Hymenoptera: Braconidae). Abstracts 6th European Workshop on Insect Parasitoids, Valencia, March 1997 .

Chemically mediated associative learning in the host foraging behavior of the aphid parasitoid Aphidius ervi (Hymenoptera: Braconidae)

A - Papers appearing in refereed journals

Du, Y., Poppy, G. M., Powell, W. and Wadhams, L. J. 1997. Chemically mediated associative learning in the host foraging behavior of the aphid parasitoid Aphidius ervi (Hymenoptera: Braconidae). Journal of Insect Behavior. 10, pp. 509-522.

Aphid parasitoid responses to semiochemicals - genetic, conditioned or learnt?

A - Papers appearing in refereed journals

Poppy, G. M., Powell, W. and Pennacchio, F. 1997. Aphid parasitoid responses to semiochemicals - genetic, conditioned or learnt? Entomophaga. 42, pp. 193-199.

Sublethal effects of pesticides on locomotory behaviour of beneficial arthropods

C1 - Edited contributions to conferences/learned societies

Kennedy, P. J., Umoru, P. A. and Powell, W. 1997. Sublethal effects of pesticides on locomotory behaviour of beneficial arthropods. Haskell, P. T. and McEwen, P. K. (ed.) New studies in ecotoxicology . Welsh Pest Management Forum. pp. 37-41

'Push-Pull' strategies for pest control

G - Articles in popular magazines and other technical publications

Smart, L. E., Pickett, J. A. and Powell, W. 1997. 'Push-Pull' strategies for pest control. Grain Legumes. No. 15, pp. 14-15.

The occurrence of aphid parasitoids in arable crops in northern Pakistan

C2 - Non-edited contributions to conferences

Rehman, A., Powell, W., Deadman, M. L. and Hashmi, A. A. 1997. The occurrence of aphid parasitoids in arable crops in northern Pakistan. Abstracts 3rd International Congress of Entomological Sciences, Islamabad, 18-20 March 1997 .

Influence of wheat and oat cultivars on the development of the cereal aphid parasitoid Aphidius rhopalosiphi and the generalist aphid parasitoid Ephedrus plagiator

A - Papers appearing in refereed journals

Fuentes-Contreras, J. E., Powell, W., Wadhams, L. J., Pickett, J. A. and Niemeyer, H. M. 1996. Influence of wheat and oat cultivars on the development of the cereal aphid parasitoid Aphidius rhopalosiphi and the generalist aphid parasitoid Ephedrus plagiator. Annals of Applied Biology - AAB. 128 (2), pp. 181-187. https://doi.org/10.1111/j.1744-7348.1996.tb05742.x

Host preference behaviour of the aphid parasitoids Praon volucre and Praon myzophagum (Hymenoptera: Aphidiidae)

C2 - Non-edited contributions to conferences

Rehman, A., Powell, W. and Deadman, M. L. 1996. Host preference behaviour of the aphid parasitoids Praon volucre and Praon myzophagum (Hymenoptera: Aphidiidae). Abstracts 2nd International Congress of Entomological Sciences, Islamabad, 19-21 March 1996 . pp. 69-70

Parasitoid responses to semiochemicals - innate, conditioned or learnt?

C2 - Non-edited contributions to conferences

Poppy, G. M., Powell, W. and Pennacchio, F. 1996. Parasitoid responses to semiochemicals - innate, conditioned or learnt? Proceedings Aphidophaga 6, Gembloux, 2-6 September 1996 .

Reproduction of beneficial predators and parasitoids in agroecosystems in relation to habitat quality and food availability

A - Papers appearing in refereed journals

Sunderland, K. D., Bilde, T., Den Nijs, L. J. M. F., Dinter, A., Heimbach, U., Lys, J. A., Powell, W. and Toft, S. 1996. Reproduction of beneficial predators and parasitoids in agroecosystems in relation to habitat quality and food availability. Acta Jutlandica. 71(2), pp. 117-153.

Genetic influences on aphid parasitoid host selection

C2 - Non-edited contributions to conferences

Powell, W. and Rehman. A. 1996. Genetic influences on aphid parasitoid host selection.

Strategies involved in the location of hosts by the aphid parasitoid Aphidius ervi Halliday (Hymenoptera: Braconidae: Aphidiinae)

C2 - Non-edited contributions to conferences

Powell, W., Pennacchio, F., Poppy, G. M. and Tremblay, E. 1996. Strategies involved in the location of hosts by the aphid parasitoid Aphidius ervi Halliday (Hymenoptera: Braconidae: Aphidiinae). Proceedings 20th International Congress of Entomology, Firenze, 25-31 August 1996 . pp. 623

The role of host-induced plant synomones on in-flight orientation of the aphid parasitoid Aphidius ervi Haliday (Hymenoptera, Braconidae)

C2 - Non-edited contributions to conferences

Guerrieri, E., Du, Y.J., Poppy, G. M., Powell, W., Pennacchio, F. and Tremblay, E. 1996. The role of host-induced plant synomones on in-flight orientation of the aphid parasitoid Aphidius ervi Haliday (Hymenoptera, Braconidae). Proceedings 20th International Congress of Entomology, Firenze, 25-31 August 1996 . pp. 647

Relative importance of semiochemicals from first and second trophic levels in host foraging behaviour of Aphidius ervi

A - Papers appearing in refereed journals

Du, Y.J., Poppy, G. M. and Powell, W. 1996. Relative importance of semiochemicals from first and second trophic levels in host foraging behaviour of Aphidius ervi. Journal of Chemical Ecology. 22, pp. 1591-1605.

Colour vision and oviposition behaviour in Aphidius ervi Haliday (Hymenoptera, Braconidae)

C2 - Non-edited contributions to conferences

Battaglia, D., Pennacchio, F., Romano, A., Tranfaglia, A., Poppy, G. M. and Powell, W. 1996. Colour vision and oviposition behaviour in Aphidius ervi Haliday (Hymenoptera, Braconidae). Proceedings 20th International Congress of Entomology, Firenze, 25-31 August 1996 . pp. 647

The foraging efficiency of the parasitoid Diaeretiella rapae (Hymenoptera: Braconidae) in relation to the spatial distribution of aphids on plants

A - Papers appearing in refereed journals

Powell, W. and Nickless, A. 1996. The foraging efficiency of the parasitoid Diaeretiella rapae (Hymenoptera: Braconidae) in relation to the spatial distribution of aphids on plants. Acta Jutlandica. 71(2), pp. 97-106.

Sex pheromone of aphid parasitoid Praon volucre (Hymenoptera, Braconidae)

A - Papers appearing in refereed journals

Nazzi, F., Powell, W., Wadhams, L. J. and Woodcock, C. M. 1996. Sex pheromone of aphid parasitoid Praon volucre (Hymenoptera, Braconidae). Journal of Chemical Ecology. 22, pp. 1169-1175.

Aphid attack - working on the insides

G - Articles in popular magazines and other technical publications

Powell, W. 1996. Aphid attack - working on the insides. Farming and Conservation. April 1996, pp. 12-14.

Effect of pirimicarb on the foraging behaviour of Diaeretiella rapae (Hymenoptera: Braconidae) on host-free and infested oilseed rape plants

A - Papers appearing in refereed journals

Umoru, P. A., Powell, W. and Clark, S. J. 1996. Effect of pirimicarb on the foraging behaviour of Diaeretiella rapae (Hymenoptera: Braconidae) on host-free and infested oilseed rape plants. Bulletin of Entomological Research. 86 (2), pp. 193-201. https://doi.org/10.1017/S0007485300052445

Fatal attraction

G - Articles in popular magazines and other technical publications

Powell, W. 1995. Fatal attraction. Grower. 124(5), pp. 17-18.

Populations and communities

B - Book chapters etc edited externally

Powell, W. and Walton, M. P. 1995. Populations and communities. in: Jervis, M. A. and Kidd, N. (ed.) Insect natural enemies: practical approaches to their study and evaluation Chapman & Hall, London. pp. 223-292

Within-field spatial heterogeneity of arthropod predators and parasitoids

C1 - Edited contributions to conferences/learned societies

Powell, W., Hawthorne, A., Hemptinne, J. L., Holopainen, J. K., Den Nijs, L. J. F. M., Riedel, W. and Ruggle, P. 1995. Within-field spatial heterogeneity of arthropod predators and parasitoids.

Using mark-release-recapture techniques to study the influence of spatial heterogeneity on carabids

C1 - Edited contributions to conferences/learned societies

Powell, W. and Ashby, J. E. 1995. Using mark-release-recapture techniques to study the influence of spatial heterogeneity on carabids.

Variations of body length, weight, fat content and survival in Coccinella septempunctata at different hibernation sites

A - Papers appearing in refereed journals

Zhou, X-L, Honek, A., Powell, W. and Carter, N. 1995. Variations of body length, weight, fat content and survival in Coccinella septempunctata at different hibernation sites. Entomologia Experimentalis et Applicata. 75 (2), pp. 99-107.

Effects of incorporating or burning straw, and of different cultivation systems, on winter wheat grown on two soil types, 1985-91

A - Papers appearing in refereed journals

Prew, R. D., Ashby, J. E., Bacon, E. T. G., Christian, D. G., Gutteridge, R. J., Jenkyn, J. F., Powell, W. and Todd, A. D. 1995. Effects of incorporating or burning straw, and of different cultivation systems, on winter wheat grown on two soil types, 1985-91. The Journal of Agricultural Science. 124 (2), pp. 173-194. https://doi.org/10.1017/S0021859600072853

The aphid sex pheromone: a novel host location cur for the parasitoid Praon volucre

C1 - Edited contributions to conferences/learned societies

Lilley, R., Hardie, J., Powell, W. and Wadhams, L. J. 1994. The aphid sex pheromone: a novel host location cur for the parasitoid Praon volucre. Proceedings Brighton Crop Protection Conference - Pests and Diseases, 1994 . Wiley.

Electrophoretic studies of geographic and host strains of the aphid parasitoid Aphidius ervi

C2 - Non-edited contributions to conferences

Atanassova, P., Powell, W., Brookes, C. and Loxdale, H. 1994. Electrophoretic studies of geographic and host strains of the aphid parasitoid Aphidius ervi. Abstracts 5th European Congress of Entomology, York, 29th August-2nd September 1994 . pp. 251

Seasonal distribution and aerial movement of adult coccinellids on farmland

A - Papers appearing in refereed journals

Zhou, X-L, Carter, N. and Powell, W. 1994. Seasonal distribution and aerial movement of adult coccinellids on farmland. Biocontrol Science and Technology. 4, pp. 167-175.

Nemec and Stary's "population diversity centre" hypothesis for aphid parasitoids revisited

A - Papers appearing in refereed journals

Powell, W. 1994. Nemec and Stary's "population diversity centre" hypothesis for aphid parasitoids revisited. Norwegian Journal of Agricultural Sciences. Supplement 16, pp. 163-169.

The responses of Praon spp. parasitoids to aphid sex pheromone components in the field

A - Papers appearing in refereed journals

Hardie, J., Hick, A. J., Holler, C., Mann, J., Merritt, L., Nottingham, S. F., Powell, W., Wadhams, L. J., Witthinrich, J. and Wright, A. F. 1994. The responses of Praon spp. parasitoids to aphid sex pheromone components in the field. Entomologia Experimentalis et Applicata. 71 (2), pp. 95-99.

Design of field trials and its influence on the detection of pesticide side effects

C2 - Non-edited contributions to conferences

Kennedy, P. J., Carter, N., Walters, K. F. A., Perry, J. N., Powell, D. and Powell, W. 1994. Design of field trials and its influence on the detection of pesticide side effects. Abstracts Ecotoxicology - Ecological Dimensions: Proceedings 5th Annual Meeting of SETAC-Europe (UK Branch), Sheffield, 12-14 September 1994 . pp. 11

Design of field trials and its influence on the detection of pesticide side effects

C2 - Non-edited contributions to conferences

Kennedy, P. J., Carter, N., Walters, K. F. A., Perry, J. N., Powell, D. and Powell, W. 1994. Design of field trials and its influence on the detection of pesticide side effects. Abstracts 5th European Congress of Entomology, York, 29th August-2nd September 1994 . pp. 276

The field attraction of female %Praon parasitoids to an aphid sex pheromone

C2 - Non-edited contributions to conferences

Lilley, R. I., Hardie, J., Powell, W. and Wadhams, L. J. 1993. The field attraction of female %Praon parasitoids to an aphid sex pheromone. Abstracts 5th International Symposium of the Global IOBC Working Group on the Ecology of Aphidophaga: Behavioural Ecology, Augmentation and Enhancement of Aphidophaga, Antibes, 6-10 September 1993 .

Electroantennogram and olfactometer responses of aphid parasitoids to nepetalactone, a component of aphid sex pheromones

C2 - Non-edited contributions to conferences

Hardie, J., Isaacs, R., Nazzi, F., Powell, W., Wadhams, L. J. and Woodcock, C. M. 1993. Electroantennogram and olfactometer responses of aphid parasitoids to nepetalactone, a component of aphid sex pheromones. Abstracts 5th International Symposium of the Global IOBC Working Group on the Ecology of Aphidophaga: Behavioural Ecology, Augmentation and Enhancement of Aphidophaga, Antibes, 6-10 September 1993 .

Responses of the parasitoid Praon volucre (Hymenoptera: Braconidae) to aphid sex pheromone lures in cereal fields in autumn: implications for parasitoid manipulation

A - Papers appearing in refereed journals

Powell, W., Hardie, J., Hick, A. J., Holler, C., Mann, J., Merritt, L., Nottingham, S. F., Wadhams, L. J., Witthinrich, J. and Wright, A. F. 1993. Responses of the parasitoid Praon volucre (Hymenoptera: Braconidae) to aphid sex pheromone lures in cereal fields in autumn: implications for parasitoid manipulation. European Journal of Entomology. 90, pp. 435-438.

Sex pheromones in the cereal aphid parasitoids Praon volucre and Aphidius rhopalosiphi

A - Papers appearing in refereed journals

Decker, U. M., Powell, W. and Clark, S. J. 1993. Sex pheromones in the cereal aphid parasitoids Praon volucre and Aphidius rhopalosiphi. Entomologia Experimentalis et Applicata. 69 (1), pp. 33-39. https://doi.org/10.1111/j.1570-7458.1993.tb01725.x

Management of genetics of biological control introductions

A - Papers appearing in refereed journals

Hopper, K. R., Roush, R. T. and Powell, W. 1993. Management of genetics of biological control introductions. Annual Review of Entomology. 38, pp. 27-51.

The relationship between primary parasitoids and hyperparasitoids of cereal aphids: an analysis of field data

A - Papers appearing in refereed journals

Holler, C., Borgemeister, C. W., Haardt, H. and Powell, W. 1993. The relationship between primary parasitoids and hyperparasitoids of cereal aphids: an analysis of field data. Journal of Animal Ecology. 62 (1), pp. 12-21. https://doi.org/10.2307/5478

Synomones and kairomones from plants and honeydew in susceptible and resistant varieties; their importance to natural enemies.

C2 - Non-edited contributions to conferences

Powell, W. 1992. Synomones and kairomones from plants and honeydew in susceptible and resistant varieties; their importance to natural enemies. Abstracts 19th International Congress of Entomology, Beijing, 1992 .

Genetics of biological control introductions

C2 - Non-edited contributions to conferences

Hopper, K. R., Rousch, R. T. and Powell, W. 1992. Genetics of biological control introductions. Abstracts 19th International Congress of Entomology, Beijing, 1992 .

Genetics of biological control introductions

C2 - Non-edited contributions to conferences

Hopper, K. R., Roush, R. T. and Powell, W. 1992. Genetics of biological control introductions. Abstracts 19th International Congress of Entomology, Beijing, 1992 .

Tritrophic influences on aphid parasitoids (Hym.,Braconidae:Aphidiinae)

C1 - Edited contributions to conferences/learned societies

Powell, W. 1992. Tritrophic influences on aphid parasitoids (Hym.,Braconidae:Aphidiinae).

Honeydew as an ovipositional stimulant for two species of syrphids

A - Papers appearing in refereed journals

Budenberg, W. J. and Powell, W. 1992. Honeydew as an ovipositional stimulant for two species of syrphids. Entomologia Experimentalis et Applicata. 64, pp. 57-61.

The influence of aphids and honeydew on the leaving rate of searching aphid parasitoids from wheat plants

A - Papers appearing in refereed journals

Budenberg, W. J., Powell, W. and Clark, S. J. 1992. The influence of aphids and honeydew on the leaving rate of searching aphid parasitoids from wheat plants. Entomologia Experimentalis et Applicata. 63 (3), pp. 259-264. https://doi.org/10.1111/j.1570-7458.1992.tb01582.x

The influence of host food plants on host recognition by four aphidiine parasitoids (Hymenoptera: Braconidae)

A - Papers appearing in refereed journals

Powell, W. and Wright, A. F. 1992. The influence of host food plants on host recognition by four aphidiine parasitoids (Hymenoptera: Braconidae). Bulletin of Entomological Research. 81 (4), pp. 449-453. https://doi.org/10.1017/S0007485300032028

Ecology and population dynamics: Chairman's summing up and comments for the session on ecology and population dynamics

C2 - Non-edited contributions to conferences

Powell, W. 1991. Ecology and population dynamics: Chairman's summing up and comments for the session on ecology and population dynamics. Proceedings 4th European Parasitoid Workshop, Perugia, Italy, 3-5 April 1991 . pp. 5-6

Biochemical interactions between plant-herbivore-parasitoid

C1 - Edited contributions to conferences/learned societies

Pickett, J. A., Powell, W., Wadhams, L. J., Woodcock, C. M. and Wright, A. F. 1991. Biochemical interactions between plant-herbivore-parasitoid. Insect Parasitoids: 4th European Workshop, Perugia, April 1991.

Cereal aphids and their natural enemies

C1 - Edited contributions to conferences/learned societies

Wratten, S. D. and Powell, W. 1991. Cereal aphids and their natural enemies. Carter, N., Potts, G. R., Darbyshire, J. F. and Firbank, L. G. (ed.) The Ecology of Temperate Cereal Fields. Proceedings 32nd Symposium of the British Ecological Society with the Association of Applied Biologists, University of Cambridge, 1991. Blackwell Scientific Publications, Oxford. pp. 233-257

The influence of semiochemicals on the behaviour of cereal aphid parasitoids (Hymenoptera)

C1 - Edited contributions to conferences/learned societies

Powell, W., Decker, U. M. and Budenberg, W. J. 1991. The influence of semiochemicals on the behaviour of cereal aphid parasitoids (Hymenoptera). Chambers, R. J., Hodek, I., Dixon, A. F. G. and Polgar, L. (ed.) Behaviour and impact of Aphidophaga. SPB Academic Publishing, The Hague. pp. 67-71

Synthetic aphid sex pheromone lures female parasitoids

A - Papers appearing in refereed journals

Hardie, J., Nottingham, S. F., Powell, W. and Wadhams, L. J. 1991. Synthetic aphid sex pheromone lures female parasitoids. Entomologia Experimentalis et Applicata. 61 (1), pp. 97-99.

Conservation and manipulation of aphid parasitoids

C1 - Edited contributions to conferences/learned societies

Powell, W., Budenberg, W. J., Decker, U. M. and Wright, A. F. 1990. Conservation and manipulation of aphid parasitoids. Proceedings Brighton Crop Protection Conference - Pests and Diseases, 1990. pp. 185-690

The use of electrophoresis in the study of hymenopteran parasitoids of agricultural pests.

B - Book chapters etc edited externally

Powell, W. and Walton, M. P. 1989. The use of electrophoresis in the study of hymenopteran parasitoids of agricultural pests. in: Electrophoretic studies on agricultural pests. Systematics Association Special Volume H.D. Loxdale & J. Den Hollander eds Clarendon Press, Oxford.

Effectiveness of different insecticides applied at various growth stages to control aphids on winter wheat.

A - Papers appearing in refereed journals

Carter, N., Powell, W., Wright, A. F. and Ashby, J. E. 1989. Effectiveness of different insecticides applied at various growth stages to control aphids on winter wheat. Crop Protection. 8, pp. 271-276.

Observations on the effects of an autumn application of a pyrethroid insecticide on non-target predatory species in winter cereals.

C1 - Edited contributions to conferences/learned societies

Purvis, G., Carter, N. and Powell, W. 1988. Observations on the effects of an autumn application of a pyrethroid insecticide on non-target predatory species in winter cereals. Integrated crop protection in cereals. Proceedings of the EC Experts' Group Meeting, Littlehampton, 1986. Eds R. Cavalloro & K. Sunderland. pp. 153-159

Honeydew as a kairomone for aphid parasitoids and hyperparasitoids.

C1 - Edited contributions to conferences/learned societies

Budenberg, W. J. and Powell, W. 1988. Honeydew as a kairomone for aphid parasitoids and hyperparasitoids. &nbsp;Proceedings British Crop Protection Conference - Pests and Diseases, Brighton, 1988, 1149-1154..

The abilities of the aphid parasitoids Aphidius ervi Haliday and A. rhopalosiphi De Stefani Perez (Hymenoptera: Braconidae) to transfer between different known host species and the implications for the use of alternative hosts in pest control strategies.

A - Papers appearing in refereed journals

Powell, W. and Wright, A. F. 1988. The abilities of the aphid parasitoids Aphidius ervi Haliday and A. rhopalosiphi De Stefani Perez (Hymenoptera: Braconidae) to transfer between different known host species and the implications for the use of alternative hosts in pest control strategies. Bulletin of Entomological Research. 78 (4), pp. 683-693. https://doi.org/10.1017/S0007485300015546

Accurate estimation of invertebrate density in cereals.

G - Articles in popular magazines and other technical publications

Sunderland, K. D., Hawkes, C., Stevenson, J. H., Mcbride, T., Smart, L. E., Sopp, P. I., Powell, W., Chambers, R. J. and Carter, O. C. R. 1987. Accurate estimation of invertebrate density in cereals. Bulletin IOBC/WPRS/SROP . 10, pp. 71-81.

Interference between parasitoids (Hym.: Aphididae) and fungi (Entomophthorales) attacking cereal aphids.

A - Papers appearing in refereed journals

Powell, W., Wilding, N., Brobyn, P. J. and Clark, S. J. 1986. Interference between parasitoids (Hym.: Aphididae) and fungi (Entomophthorales) attacking cereal aphids. Entomophaga. 31, pp. 293-302. https://doi.org/10.1007/BF02373339

The influence of weeds on aphid-specific natural enemies in winter wheat.

A - Papers appearing in refereed journals

Powell, W., Dean, G. J. and Wilding, N. 1986. The influence of weeds on aphid-specific natural enemies in winter wheat. Crop Protection. 5, pp. 182-189.

Biocontrol of cereal aphids in the United Kingdom by a range of natural enemies.

G - Articles in popular magazines and other technical publications

Powell, W. 1986. Biocontrol of cereal aphids in the United Kingdom by a range of natural enemies.

Enhancing parasitoid activity in crops.

G - Articles in popular magazines and other technical publications

Powell, W. 1986. Enhancing parasitoid activity in crops.

Assessment of resistance of commercial varieties of winter-wheat to cereal aphids

A - Papers appearing in refereed journals

Dewar, A. M., Carter, N. and Powell, W. 1985. Assessment of resistance of commercial varieties of winter-wheat to cereal aphids. Annals of Applied Biology - AAB. 106, pp. 168-169.

Effects of pirimicarb, dimethoate and benomyl on natural enemies of cereal aphids in winter wheat

A - Papers appearing in refereed journals

Powell, W., Dean, G. J. and Bardner, R. 1985. Effects of pirimicarb, dimethoate and benomyl on natural enemies of cereal aphids in winter wheat. Annals of Applied Biology - AAB. 106 (2), pp. 235-242. https://doi.org/10.1111/j.1744-7348.1985.tb03113.x

The influence of weeds on polyphagous arthropod predators in winter wheat

A - Papers appearing in refereed journals

Powell, W., Dean, G. J. and Dewar, A. 1985. The influence of weeds on polyphagous arthropod predators in winter wheat. Crop Protection. 4, pp. 298-312.

Pheromones in the management of beneficial insects

A - Papers appearing in refereed journals

Pickett, J. A., Dawson, G. W., Free, J. B., Griffiths, D. C., Powell, W., Williams, I. M. and Woodcock, C. M. 1984. Pheromones in the management of beneficial insects. Proceedings of the British Crop Protection Council. 1, pp. 247-254.

Pheromones in the management of beneficial insects

A - Papers appearing in refereed journals

Dawson, G. W., Free, J. B., Griffiths, D. C., Powell, W., Williams, I. M. and Woodcock, C. M. 1984. Pheromones in the management of beneficial insects. Proceedings of the British Crop Protection Council. 1, pp. 247-254.

Reservoirs for Aphidius ervi Haliday (Hymenoptera: Aphidiidae), a polyphagous parasitoid of cereal aphids (Hemiptera: Aphididae)

A - Papers appearing in refereed journals

Cameron, P. J., Powell, W. and Loxdale, H. D. 1984. Reservoirs for Aphidius ervi Haliday (Hymenoptera: Aphidiidae), a polyphagous parasitoid of cereal aphids (Hemiptera: Aphididae). Bulletin of Entomological Research. 74 (4), pp. 647-656. https://doi.org/10.1017/S0007485300014024

The role of parasitoids in limiting cereal aphid populations

B - Book chapters etc edited externally

Powell, W. 1983. The role of parasitoids in limiting cereal aphid populations. in: Cavalloro, R. (ed.) Rotterdam, Netherlands A.A. Balkema. pp. 50-56

The reactions of two cereal aphid parasitoids, aphidius-uzbekistanicus and aphidius-ervi to host aphids and their food-plants

A - Papers appearing in refereed journals

Powell, W. and Zhang, Z. L. 1983. The reactions of two cereal aphid parasitoids, aphidius-uzbekistanicus and aphidius-ervi to host aphids and their food-plants. Physiological Entomology. 8 (4), pp. 439-443. https://doi.org/10.1111/j.1365-3032.1983.tb00378.x

The role of parasitoids in limiting cereal aphid populations

A - Papers appearing in refereed journals

Powell, W. 1982. The role of parasitoids in limiting cereal aphid populations. Aphid antagonists. Proceedings of a meeting of the EC Experts' Group, Portici, Italy, 23-24 November 1982. pp. 50-56.

The identification of hymenopterous parasitoids attacking cereal aphids in Britain

A - Papers appearing in refereed journals

Powell, W. 1982. The identification of hymenopterous parasitoids attacking cereal aphids in Britain. Systematic Entomology. 7 (4), pp. 465-473. https://doi.org/10.1111/j.1365-3113.1982.tb00457.x

Towards integrated control of cereal aphids

A - Papers appearing in refereed journals

Powell, W., Dean, G. J., Dewar, A. M. and Wilding, N. 1981. Towards integrated control of cereal aphids. Proceedings of the British Insecticide and Fungicide Conference. 11.

The relative abundance of the hymenopterous parasites attacking metopolophium-dirhodum (walker) and sitobion-avenae (f) (hemiptera, aphididae) on cereals during 1973-79 in southern England

A - Papers appearing in refereed journals

Dean, G. J., Jones, M. G. and Powell, W. 1981. The relative abundance of the hymenopterous parasites attacking metopolophium-dirhodum (walker) and sitobion-avenae (f) (hemiptera, aphididae) on cereals during 1973-79 in southern England. Bulletin of Entomological Research. 71 (2), pp. 307-315. https://doi.org/10.1017/s0007485300008336

Toxares deltiger (Haliday) (Hymenoptera: Aphidiidae) parasiting the cereal aphid, Metopolophium dirhodum (Walker) (Hemiptera: Aphididae), in southern England: a new host-parasitoid record

A - Papers appearing in refereed journals

Powell, W. 1980. Toxares deltiger (Haliday) (Hymenoptera: Aphidiidae) parasiting the cereal aphid, Metopolophium dirhodum (Walker) (Hemiptera: Aphididae), in southern England: a new host-parasitoid record. Bulletin of Entomological Research. 70 (3), pp. 407-409. https://doi.org/10.1017/s0007485300007665