Environmental Entomology (1990) 19, 785-790

M.G. Feng and J.B. Johnson (1990)
Relative virulence of six isolates of Beauveria bassiana on Diuraphis noxia (Homoptera: Aphididae)
Environmental Entomology 19 (3), 785-790
Abstract: The virulence of 6 isolates of Beauveria bassiana to Diuraphis noxia was bioassayed. All the isolates tested were capable of infecting D. noxia, but their virulence, determined by LC₅₀s and LT₅₀s varied. An isolate derived from Schizaphis graminum (SGBB8601) had the lowest LC₅₀ (0.57 X 10⁵ conidia/ml), and among the shortest LT₅₀s at all 5 concentrations of conidial suspension. Two isolates from non-homopterous hosts (the chrysomelid Leptinotarsa decemlineata (BB344) and a single spore isolate from Boverin formulation (BB286)) and one from a homopterous host (Nephotettix bipunctata cincticeps [N. cincticeps] (BB1554)) also displayed significant virulence and were very similar to one another, whereas 2 Homoptera-derived isolates (from Nilaparvata lugens (BB717) and Deois flavopicta (BB806)) were significantly less virulent. Log-transformed concentration and post-treatment time (days) were correlated with probit-transformed mortality induced by each of the isolates. The resulting models, using 3rd-order polynomials, gave good predictions of mortality within the range of concentrations tested. Colony growth rates for 4 isolates (SGBB8601, BB717, BB344 and BB286) were relatively similar. Differences in virulence among the tested isolates are discussed in conjunction with their geographic origins, insect hosts and growth and sporulation characteristics. For probit analysis over incubation time SAS-PROC GLM was used.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Diuraphis noxia
Beauveria bassiana (entomopathogen)	Diuraphis noxia