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Temporal and Spatial Production of Bollworm from Various Host Crops in North Carolina: Implications for Bt Resistance Management

R.E. Jackson, J.R. Bradley, Jr., and J.W. Van Duyn


Bollworm, Helicoverpa zea (Boddie), production from various host crops was measured in 2003 by weekly larval and adult monitoring in commercial crop fields to compare temporal and spatial production of bollworm from non-cotton crop hosts with that from Bollgard and nBt cottons. Pheromone trap catches demonstrated that bollworm larval production in localized areas had little impact on the number of moths collected from the local environment, which suggests a high level of movement by bollworm adults. Results from larval monitoring in commercial fields of corn, cotton, peanut, and soybean demonstrated the potential for alternate host crops to produce much higher numbers of bollworm compared to Bollgard® or nBt cottons. Thus, these results show that temporal and spatial production of bollworm by various host crops favor Bt resistance management and that alternate host crops can effectively supplement or replace the 5% unsprayed cotton refuge for Bollgard and Bollgard II® cottons in the diversified southeast U. S. agroecosystem.

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Document last modified 04/27/04