Field tests with a highly concentrated Bacillus thuringiensis formula against spruce budworm, Choristoneura fumiferana (Clem.) (Lepidoptera: tortricidae)

Abstract

Field tests were conducted in 1980, 1981, and 1982 with a new Bacillus thuringiensis formula called Futura. Tests were conducted with a Grumman AgCat aircraft on 40 ha forest blocks and with a DC-4G aircraft on larger forested areas. Futura which is able to disperse the required 20 x 10⁹ I.U./ha for spruce budworm control in 2.5 L/ha proved to be physically and bacteriologically stable and easy to mix. Also it assured a deposit of up to 80% emitted volume, a larval mortality in the range of 70 to 90%, and a foliage protection of about 70%. Because of its low-volume dispersion property and other qualities it is a most valuable alternative to chemical insecticides for spruce budworm control.

Parent Publication

• Proceedings, Symposium: Microbial control of spruce budworms and gypsy moths

Citation

Smirnoff, W. A. 1985. Field tests with a highly concentrated Bacillus thuringiensis formula against spruce budworm, Choristoneura fumiferana (Clem.) (Lepidoptera: tortricidae). In: Grimble, David G.; Lewis, Franklin B., coords. Proceedings, Symposium: Microbial control of spruce budworms and gypsy moths; 1984 April 10-12; Windsor Locks, CT. Gen. Tech. Rep. NE-100. Broomall, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 55-59