Laboratory evaluation of temperature effects on the germination and growth of entomopathogenic fungi and on their pathogenicity to two aphid species

A - Papers appearing in refereed journals

Yeo, H., Pell, J. K., Alderson, P. G., Clark, S. J. and Pye, B. J. 2003. Laboratory evaluation of temperature effects on the germination and growth of entomopathogenic fungi and on their pathogenicity to two aphid species. Pest Management Science. 59 (2), pp. 156-165.

AuthorsYeo, H., Pell, J. K., Alderson, P. G., Clark, S. J. and Pye, B. J.
Abstract

As part of an approach to select potential mycoinsecticides for aphid biocontrol, we investigated the effects of temperature on the growth, germination and pathogenicity of some hyphomycete fungi. Commercially available mycoinsecticides (based on Beauveria bassiana (Balsamo) Vuillemin and Verticillium lecanii (Zimmermann) Viegas) and other isolates of B bassiana, V lecanii, Metarhizium anisopliae (Metschnikoff) Sorokin and Paecilomyces fumosoroseus (Wize) Brown & Smith were evaluated. The rate of in vitro conidial germination of all isolates was slower at 10 and 15degreesC than at 20 and 25degreesC. Similarly, in vitro growth of most isolates was adversely affected at 10 and 15degreesC. The greatest reduction at 10degreesC in rates of conidial germination and colony growth, compared with other temperatures, was for M anisopliae isolates. Germination of V lecanii (isolate HRI 1.72) was fastest at 10degreesC compared with the other fungi. It was also the most pathogenic of three isolates tested against Aphis fabae Scopoli and Myzus persicae Sulzer at 10, 18 and 23degreesC. Generally, A fabae was more susceptible than M persicae to infection by the fungal isolates tested. A significant interaction between aphid species and temperature indicated that the pathogenic nature of an isolate was dependent not only on the target aphid species but also the temperature conditions of the bioassay. The series of studies, detailed above, allowed a temperature profile to be formed for the different isolates. Verticillium lecanii isolate HRI 1.72 (commercialised as Ver-talec(R)) was the most promising isolate selected from results of the series of experiments. Temperature profiles in conjunction with infectivity assays can be useful in selecting appropriate isolates for a particular thermal environment. (C) 2003 Society of Chemical Industry.

KeywordsAgronomy; Entomology
Year of Publication2003
JournalPest Management Science
Journal citation59 (2), pp. 156-165
Digital Object Identifier (DOI)doi:10.1002/ps.622
PubMed ID12587869
Open accessPublished as non-open access
FunderDepartment of Environment, Food and Rural Affairs
Funder project or code436
437
445
514
509
513
Collaborative statistical investigations into biological processes
Field studies: semiochemicals and pest/natural enemy dynamics
The diversity, biology and dynamics of microbial agents that regulate nematode populations in the rhizosphere
Utilising populations of natural enemies for control of cereal aphids
Output statusPublished
Publication dates
Online07 Jan 2003
Publication process dates
Accepted19 Aug 2002
Copyright licensePublisher copyright
PublisherWiley
ISSN1526-498X

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