Techniques for Evaluating 'Bacillus thuringiensis' and Spray Equipment for Aerial Application against Forest Defoliating Insects

摘要

The most promising Dipel and Thuricide forestry spray formulations and spray equipment were studied to improve aerial application techniques and the effectiveness of Bacillus thuringiensis against forest insects. A fixed-wing aircraft, equipped with T8010 nozzles, was used to apply each formulation containing about 8 billion international Units of Bacillus thuringiensis per 2 gallons per acre to potted Douglas-fir, Pseudotsuga Menziesii, trees. These trees were placed at 10-foot intervals across the spray swath and were subsequently bioassayed with test insects.