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Description and details of a new method of estimating the virulence of an entomophthoraceous fungus pathogenic to aphids


  • Oger, R. & Latteur, G. (1985). Description and details of a new method of estimating the virulence of an entomophthoraceous fungus pathogenic to aphids. Parasitica, 41: (4),
Type Journal Article
Year 1985
Title Description and details of a new method of estimating the virulence of an entomophthoraceous fungus pathogenic to aphids
Journal Parasitica
Recnumber 162
Volume 41
Issue 4
Endnote Keywords Natural enemies|Microbial pesticides|pathogens|hosts|Techniques|estimation|entomopathogens|biological control|pest control|control|agricultural entomology|biological control agents|fungal infection|
Abstract A new method of estimating the infectivity of Erynia neoaphidis to alates and apterae of Acyrthosiphon pisum is described, with a view to the possible use of this fungus for biological control of the aphid. The maximum likelihood probit analysis on 33 assays indicates significant regressions between the logarithm of the dose used and the probit mortality for all assays. The LC50s averaged 0.78 conidia/mm2 for alates and 1.3/mm2 for apterae, and the weighted mean slopes were similar for the 2 aphid types. The variability between assays was greater for apterae than for alates, which are therefore more suitable for use in bioassays. The number of replicated tests was found to have more influence than the number of doses of fungus tested or the number of aphids tested with each dose. However, results obtained with this method were sufficiently variable to make it difficult to use to detect significant differences between 2 assays for which the ratio of the LC50s is less than 2.
Notes Cited Reference Count: 12 ref. Journal article French 1 fig.
Author address Bureau d'Informatique et de Statistique Appliquees, 5800 Gembloux, Belgium.
Fichier
Lien ://19870542006
Authors Oger, R. & Latteur, G.