Monday, December 11, 2006 - 10:23 AM

Effect of Vip3A protein in transgenic cotton on heliothine larval behavior

Latha Bommireddy, and B. Roger Leonard, Louisiana State University AgCenter, Entomology, 404 Life Science Bldg, Baton Rouge, LA

A field study evaluated heliothine larval movement on transgenic (VipCot) and conventional non-Bt cotton cultivars. Cotton plant terminals of each cotton line (VipCot and conventional non-Bt) were infested with a single first-instar (48 h old) heliothine larva. A minimum of 75 plants were infested across four replications. Treatments were rated 1, 3, 6, and 24h after infestation by whole plant inspection. The number of nodes a larva migrated from the original infestation site, feeding evidence (indicated by the presence of frass), and feeding avoidance was recorded. The number of nodes heliothine larvae migrated from the plant terminal was greater on conventional non-Bt plants compared to that on VipCot plants.

Species 1: Lepidoptera Noctuidae Helicoverpa Zea (bollworm, corn earworm)
Species 2: Lepidoptera Noctuidae Heliothis virescens (tobacco budworm)

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