The impact of insecticide resistance in the currant-lettuce aphid, Nasonovia ribisnigri , on pest management in lettuce

A - Papers appearing in refereed journals

Kift, N. B., Mead, A., Reynolds, K., Sime, S., Barber, M. D., Denholm, I. and Tatchell, G. M. 2004. The impact of insecticide resistance in the currant-lettuce aphid, Nasonovia ribisnigri , on pest management in lettuce. Agricultural and Forest Entomology. 6 (4), pp. 295-309.

AuthorsKift, N. B., Mead, A., Reynolds, K., Sime, S., Barber, M. D., Denholm, I. and Tatchell, G. M.
Abstract

1 This paper reports on experiments to determine how two different insecticide resistance phenotypes in the aphid Nasonovia ribisnigri (Mosley), which is a major pest of lettuce, change its susceptibility to pyrethroid insecticides and the carbamate pirimicarb. 2 A novel statistical approach determined how the effectiveness of different insecticides was changed by the two resistance phenotypes. This compared the between-plant distribution of aphid numbers, as opposed to the mean number of aphids per plant. 3 Results from field cage experiments showed that the effect of the resistances differed. Pyrethroid resistance resulted in lower mortality immediately after application of pyrethroids, whereas resistance to pirimicarb shortened the time over which the chemical was effective. 4 The results of laboratory bioassays suggested that these two resistances were not found together in N. ribisnigri. However, the results reported here contradict this assertion. 5 Experiments with insecticide residues showed that reproduction of resistant N. ribisnigri was greater than that of susceptible N. ribisnigri on plants with ageing insecticide residues, even in circumstances where mortality of resistant and susceptible clones of N. ribisnigri were similar. 6 If more than a few aphids are found on a plant then a whole consignment can be rejected for processing. The results reported here suggest that the effect of both insecticide resistances in N. ribsinigri will be to increase the proportion of lettuce heads with an unacceptable number of aphids on them, leading to increased rejection of plants for processing.

KeywordsEntomology
Year of Publication2004
JournalAgricultural and Forest Entomology
Journal citation6 (4), pp. 295-309
Digital Object Identifier (DOI)doi:10.1111/j.1461-9555.2004.00226.x
Open accessPublished as non-open access
Funder project or code510
Project: 4242
Ecological genetics and management of insecticide resistance
Project: 4378
ISSN14619555
PublisherWiley

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