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Influence of Surrounding Crop Structure on Heliothine Trap Captures in Arkansas

K.C. Allen, R.G. Luttrell, Marvin Wall, John Smith, Dick Hardee, and Richard Voth


A two year study was conducted in Southeast Arkansas to gain information about the spatial and temporal distribution of the cotton bollworm, Helicoverpa zea, in a heterogeneous cropping environment. In 2002, three pheromone traps baited with H. zea pheromone were placed in 24 locations throughout the area. In 2003, two pheromone traps baited with H. zea pheromone and one trap baited with tobacco budworm, Heliothis virescens, pheromone were placed in 26 locations across the landscape. Early in the season (June), greater numbers of H. zea moths were captured at the interfaces of conventional corn - Bt cotton in 2002, and conventional corn – Bt cotton and Bt corn – Bt cotton in 2003. Peak H. zea moths were collected in the last two weeks of July during both seasons. During 2003, the greatest number of H. virescens moths was caught during the fourth week of June at pheromone traps located at conventional cotton – Bt cotton interfaces. Surprisingly, captures of H. virescens moths did not increase from the early season catches. Correlation analyses with the number of H. zea moths caught and the percentage of the land associated with different crops or non-crop vegetation within 1, 2, 5, 10, and 20 mile distances of each pheromone trap location resulted in six significant (p < 0.01) correlations for cotton during the month of July during 2002, but results were not similar in 2003. Overall, correlations were highly variable during 2002 and 2003 with respect to the number of H. zea moths and the percentage of crop and non-crop land.

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Document last modified 04/27/04