Pacific Southwest Research Station

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Research Station
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Research Notes

Title: Aerial field tests of five insecticides on western spruce budworm in Idaho and Montana

Author: Markin, George P.; Johnson, David R.

Date: 1986

Source: Res. Note PSW-RN-385. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 5 p

Station ID: RN-PSW-385

Description: Each of five insecticides was applied at two or three application rates by helicopter to 20-ha plots. Effectiveness of each application rate against eastern spruce budworm (Choristoneura occidentalis) was judged by comparing larval population reduction at 15 or 20 days after treatment against populations in untreated check plots. Performance of each insecticide was then compared with the levels of control normally obtained with two registered insecticides, carbaryl and acephate (90 + pct) usually used for western spruce budworm control. Maximum population reduction from sulprofos (58 pct), phosmet (59 pct), and from the growth regulator BAY SIR-8514 (58 pct), at all application rates tested was below the acceptable minimum of 90 + percent population reduction. Methomyl reduced populations 92.3 percent at 0.28 kg a.i./ha and 94.0 percent at 0.56 ke a.i./ha. Permethrin at 0.11 kg a.i./ha reduced the population by 93.9 percent. Methomyl and permethrin at these application rates appeared to be as effective as the registered insecticides acephate and carbaryl.

Keywords: western spruce budworm, Choristoneura occidentalis, insecticides, aerial field tests

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Citation

Markin, George P.; Johnson, David R.  1986.  Aerial field tests of five insecticides on western spruce budworm in Idaho and Montana.   Res. Note PSW-RN-385. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 5 p.