Bacillus thuringiensis Against Pink Bollworms on Cotton in Field Cages

A commercial preparation of Bacillus thuringiensis Berliner (Thuricidc®, 58–141, Lot D01801) was applied early in the season and evaluated for control of Pectinophora (Saunders) on cotton in 6×6×36-foot Held cages. The reduction in the population was judged by reduction in the number of rosettes and number of mines and the increased number of bolls. In the control, 80% of the bolls were infested compared with 40 and 10% in cages treated with 1 and 2 quarts of microbial insecticide per acre, respectively.