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1 June 2003 Effect of Maysin on Wild-Type, Deltamethrin-Resistant, and Bt-Resistant Helicoverpa armigera (Lepidoptera: Noctuidae)
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Larvae of the Old World corn earworm, Helicoverpa armigera (Hübner), were fed diets containing lyophilized silks from maize genotypes expressing varying levels of maysin, a flavone glycoside known to be toxic to the New World corn earworm, Helicoverpa zea Boddie. Three different H. armigera colonies were tested: a wild-type colony (96-S), a colony selected for resistance to deltamethrin (Del-R), and a colony selected for resistance to the Cry1Ac protoxin of Bacillus thuringiensis (Bt-R). A colony of H. zea was also tested as a control. High-maysin silk diets significantly slowed the growth and arrested the development of larvae from all H. armigera colonies compared with low-maysin silk diets, maysin-lacking silk diets, and no-silk control diets. The effects on the H. armigera and H. zea colonies were similar across maysin levels, although H. zea is a larger insect than H. armigera and this overall size difference was observed. Among the H. armigera colonies, maysin effects were generally similar, although 7-d-old Del-R larvae were significantly smaller than 7-d-old Bt-R and 96-S larvae for one no-silk control and two maysin-containing silk treatments. The toxic effect of maysin on the Bt-R and Del-R colonies suggests that physiological mechanisms of H. armigera resistance to Cry1Ac and deltamethrin do not confer cross-resistance to maysin.

Brian G. Rector, Gemei Liang, and Yuyuan Guo "Effect of Maysin on Wild-Type, Deltamethrin-Resistant, and Bt-Resistant Helicoverpa armigera (Lepidoptera: Noctuidae)," Journal of Economic Entomology 96(3), 909-913, (1 June 2003).
Received: 14 September 2002; Accepted: 1 November 2002; Published: 1 June 2003

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