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Describing the Micro- and Macroscale Movement of Heliothines in Bollgard Cotton Systems

R.H. Gable, B.R. Leonard, D.R. Cook, and M.M. Willrich


A field trial evaluated the interplant movement of tobacco budworm, Heliothis virescens (F.), larvae on Bollgard 2 cotton. A small plot study was conducted at the Macon Ridge Research Station using three row microplots. Treatments included Stoneville 4563B2 (Bollgard 2) planted on all three rows, Bollgard 2 planted on the center row with Stoneville 474 (conventional cultivar) planted on each side, and conventional cultivar planted all three rows. Fourth instar tobacco budworm larvae were infested on the center row of each treatment. There were significantly fewer damaged and infested fruiting forms on the Bollgard 2 plants compared to the conventional cotton. Yields in both BG2 plots were significantly higher than that in the conventional cotton plots. In a second study, Texas type 75-50 wire cone traps were utilized to determine the spatial distribution of heliothine moths adjacent to a cotton refuge. Traps for bollworm, Helicoverpa zea (Boddie), and tobacco budworms were placed at the center of the refuge and at half mile increments, for a distance of two miles, away from the refuge. Traps were sampled weekly between Jun and mid Oct. The total number of bollworm moths ranged from 2199 to 3821, and averaged 3422 moths per site. The fewest number of bollworms were collected in the refuge and densities increased at sites farther away from the refuge. The total number of tobacco budworm moths ranged from 818 to 136, among trap sites. The average capture at each site was 426 moths. The highest number of tobacco budworm moths was collected within a half mile of the refuge border. Densities declined at trap sites farther away from the refuge.

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Document last modified 04/27/04