Feeding behaviour and survival of Bacillus thuringiensis-resistant and Bacillus thuringiensis-susceptible larvae of Helicoverpa armigera (Lepidoptera: Noctuidae) exposed to a diet with Bacillus thuringiensis toxin

Luong, Tuyet T. A. , Zalucki, Myron P. , Perkins, Lynda E. and Downes, Sharon J. (2017) Feeding behaviour and survival of Bacillus thuringiensis-resistant and Bacillus thuringiensis-susceptible larvae of Helicoverpa armigera (Lepidoptera: Noctuidae) exposed to a diet with Bacillus thuringiensis toxin. Austral Entomology, . doi:10.1111/aen.12265


Author Luong, Tuyet T. A.
Zalucki, Myron P.
Perkins, Lynda E.
Downes, Sharon J.
Title Feeding behaviour and survival of Bacillus thuringiensis-resistant and Bacillus thuringiensis-susceptible larvae of Helicoverpa armigera (Lepidoptera: Noctuidae) exposed to a diet with Bacillus thuringiensis toxin
Formatted title
Feeding behaviour and survival of Bacillus thuringiensis-resistant and Bacillus thuringiensis-susceptible larvae of Helicoverpa armigera (Lepidoptera: Noctuidae) exposed to a diet with Bacillus thuringiensis toxin
Journal name Austral Entomology   Check publisher's open access policy
ISSN 2052-1758
2052-174X
Publication date 2017-01-13
Sub-type Article (original research)
DOI 10.1111/aen.12265
Open Access Status Not yet assessed
Total pages 8
Place of publication Richmond, VIC, Australia
Publisher Wiley-Blackwell Publishing Asia
Language eng
Formatted abstract
Although higher than expected numbers of surviving larvae of Helicoverpa spp. are reported in some Bollgard II cotton fields from time to time, there is no convincing evidence that field resistance has developed. A behavioural component, specifically the avoidance of the toxin, was considered to contribute to larvae surviving on Bacillus thuringiensis (Bt) toxin-expressing plants. Experiments were conducted with Bt-susceptible and Bt-resistant larvae of Helicoverpa armigera to investigate (1) how larval responses to food deprivation might lead to differences in survival and therefore how far neonates could move to find a suitable feeding site and (2) whether larvae that are physiologically susceptible vs. resistant behave differently when feeding on diet with Bt and without Bt toxins. Bt-susceptible neonates of H. armigera, which were significantly heavier, could survive without food for longer and recover better than Bt-resistant neonates. Although H. armigera neonates did not shift their behaviour with respect to Bt toxin on artificial diet before their first feeding event, the tendency of Bt-susceptible larvae to remain on non-Bt diet and move off Bt diet may allow them to survive in a Bt environment. This behaviour resulted in a higher percentage of survival in situations where a diet choice was offered.
Keyword Behavioural resistance
Bt detection
Recovery ability
Time to starvation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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