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Research Paper

Title: Control of douglas-fir tussock moth by aerially applied Dimilin (TH 6040)

Author: Hard, John S.; Ward, James D.; Ilnytzky, Steven

Date: 1978

Source: Res. Pap. PSW-RP-130. Berkeley, CA. U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 6 p

Station ID: RP-PSW-130

Description: Epidemic Douglas-fir tussock moth larval populations treated with 2.0 oz, 1.0 oz, and 0.5 oz per acre of aerially applied Dimilin were reduced 99.7 percent, 92.2 percent, and 89.7 percent, respectively, at 35 days postspray. Numbers of surviving larvae per 1000 in² were significantly different (a) at 35 days postspray, between the 2.0-oz treatment and the 1.0-oz and 0.5-oz treatments; and (b) at 28 and 35 days postspray, between the three Dimilin treatments and untreated checks. Analysis of percent unadjusted mortalities showed significant differences between the 2.0-oz treatment and the 1.0-oz and 0.5-oz treatments at 14, 21, 28, and 35 days postspray. Sample trees were heavily defoliated only in untreated and 0.5-oz treated plots.

Key Words: tussock moth, Douglas-fir, insecticides, performance tests, Pacific Northwest, British Columbia

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Citation

Hard, John S.; Ward, James D.; Ilnytzky, Steven   1978.  Control of douglas-fir tussock moth by aerially applied Dimilin (TH 6040)  Res. Pap. PSW-RP-130. Berkeley, CA. U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 6 p.

Last Modified: Nov 18, 2013 12:46:15 PM