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Aerial applications for microbial insecticides such as Bacillus thuringiensis (Bt) and the Baculoviruses differ widely in effectiveness. The size and density of the droplets, the size and feeding rates of the larvae, the behavior of the insect, and the degradation of the insecticide after its application are among the controlling factors. Distributions of droplets of different sizes have been plotted and compared with the feeding rates of gypsy moth and spruce budworm larvae. In field tests, effectiveness was not always correlated with droplet density.
Lymantria dispar, Choristoneura fumiferanae, gypsy moth, aerial spraying, Bacillus thuringiensis (Bt), spruce budworm, feeding zone, insect behavior, Baculoviruses, feeding rate, microbial spray distribution
Supervisory research entomologist, Center for Biological Control of Northeastern Forest Insects and Diseases, U.S. Department of Agriculture—Forest Service, Hamden, Conn.