Larvicidal activity of strains of Bacillus thuringiensis for Helicoverpa armigera (Huebner) and Helicoverpa punctigera Wallengren (Lepidoptera: Noctuidae) estimated using a droplet-feeding method.; Larvicidal activity of strains of Bacillus thuringiensis for Helicoverpa armigera (Huebner) and Helicoverpa punctigera Wallengren (Lepidoptera: Noctuidae) estimated using a droplet-feeding method

The potencies of 10 strains (seven subspecies) of Bacillus thuringiensis for Helicoverpa armigera and H. punctigera were compared using a droplet-feeding method. Larvae were attracted to petri dishes for dosing using a light-proof box, and imbibed the bacteria in droplets sprayed onto the dishes. Th...

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Bibliographic Details
Published in:Journal of the Australian Entomological Society 1992-01, Vol.31 (3), p.209-213
Main Authors: Teakle, R E, Caon, G, Grimshaw, J F, Byrne, V S
Format: Article
Language:English
Subjects:
Bacillus thuringiensis
Helicoverpa armigera
Helicoverpa punctigera
Lepidoptera
Noctuidae
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Summary:The potencies of 10 strains (seven subspecies) of Bacillus thuringiensis for Helicoverpa armigera and H. punctigera were compared using a droplet-feeding method. Larvae were attracted to petri dishes for dosing using a light-proof box, and imbibed the bacteria in droplets sprayed onto the dishes. The strains displayed a 300-fold difference in potency for H. armigera and 750-fold difference for H. punctigera . Two strains were equal to the commercial strain (subspecies, kurstaki , serotype 3a3b) in potency against H. armigera , namely subspecies kenyae , serotype 4a4c and aizawai , serotype 7; and one, kenyae , serotype 4a4c, was also similar to the commercial strain against H. punctigera . The strains ranked similarly in potency against H. armigera and H. punctigera , suggesting that screening for potency against both Helicoverpa spp. can be accomplished by testing against only one of the species.
ISSN:0004-9050