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Survival of Helicoverpa Zea Boddie on Bollgard Cotton

H.B. Meyers, D.R. Johnson, T.L. Singer and L.M. Page


 
ABSTRACT

In the first year of widespread planting of Bollgard cotton the cotton bollworm unexpectedly became the first pest to be a problem in Bt-transgenic cotton. Field observations revealed that bollworm larvae oviposited on flowers may be able to survive on Bollgard cotton. A laboratory experiment was conducted to compare the growth of larvae developing on Bollgard flowers versus non-Bollgard flowers. Weight was clearly affected very early in the experiment. After only 24 hours of feeding, mean weight of larvae feeding on non-Bollgard cotton was twice as great than those larvae that fed on Bollgard cotton.



Reprinted from Proceedings of the 1997 Beltwide Cotton Conferences pp. 1269 - 1271
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998