Abstract
Abstract SIR 8514 0.25 WP was applied to a Douglas-fir stand by helicopter, at a dosage rate of 2 oz ai/acre, against 5th and 6th stage larvae of the western spruce budworm, in central Montana, July 2, 1979. The same insecticide was applied by helicopter to grand-fir against 4th and 5th stage larvae of western spruce budworm near Donnelly, Idaho, Jun 22, 1980, but at a dosage rate of 4 oz ai/acre. For both applications, SIR 8514 was mixed with water for a total volume of 1 gal/acre and applied with 8002 flat fan nozzle tips, at 45 mph, 50 ft above tree tops. Each year, tests were limited to a single dosage rate applied to three plots with 5 additional plots (1979), and 3 additional plots (1980), serving as checks. Spray plots were 50 acres in size and at 5500-6000 ft elevation in Montana and 5500-6200 ft elevation in Idaho. Each plot contained 15 sample trees. Populations were expressed as mean number of larvae/100 buds; population estimates were determined 24 hr prespray, and at 3 intervals postspray in Montana and 4 intervals postspray in Idaho.
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