Comparative Toxicity of Bacillus thuringiensis Against Bollworm/budworm in Alabama Cotton

W. Moar, R. McCollum, and R. Smith


The efficacy of early season applications of Bacillus thuringiensis (Bt) formulated materials was evaluated over a three year period against the tobacco budworm, Heliothis virescens, and the cotton bollworm, Helicoverpa zea, in Alabama cotton. With the exception of Dipel ES in 1992, there were no significant differences in larval counts and damage between Bt and the untreated control. Use of Karate consistently resulted in decreased larval counts and damage, although not significantly different from other treatments in 1991. Combinations of Bt and Larvin were not significantly different from Larvin alone in larval counts and damage. However, treatments with Larvin usually were significantly different from the untreated control.

In 1991 and 1993, there were no significant differences in yield for any treatments with the exception of one Bt which performed at a level below the untreated control. In 1992, Karate, Larvin, and Larvin plus Bt consistently resulted in increased yields compared with Bt and the untreated control.

Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences pp. 1052 - 1053
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998