Environmental Entomology (1982) 11, 409-411

C.M. Ignoffo, C. Garcia, M. Kroha and T.L. Couch (1982)
High-temperature sensitivity of formulations of Bacillus thuringiensis var. israelensis
Environmental Entomology 11 (2), 409-411
Abstract: Formulations of the bacterium Bacillus thuringiensis var. israelensis, but not Bacillus thuringiensis var. kurstaki, lost most of their insecticidal activities during 28 days of exposure at 50° C. The half-lives of one liquid-flowable and two wettable-powder formulations of B. thuringiensis var. israelensis were 18.0, 7.2, and 6.0 days, respectively. No loss in activity was detected for the wettable-powder formulation of B. thuringiensis var. kurstaki. On the basis of viable spore counts, half-lives were 6.0 days for the liquid-flowable formulation, and 18.5 and 10.5 days for the two wettable-powder formulations, of B. thuringiensis var. israelensis. Differences in thermal sensitivity were attributed to relative differences in the ultrastructure of endocrystals of B. thuringiensis var. israelensis and B. thuringiensis var. kurstaki.
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Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
formulation/storage of bioagents

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Aedes aegypti
	Trichoplusia ni
Bacillus thuringiensis var. kurstaki (entomopathogen)	Trichoplusia ni
Bacillus thuringiensis var. israelensis (entomopathogen)	Aedes aegypti