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Insecticide Tests on the Douglas-Fir Cone Midge, Contarinia oregonensis Foote

Published online by Cambridge University Press:  31 May 2012

Thomas W. Koerber
Thomas W. Koerber
Affiliation:
Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, Berkeley, California
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Abstract

Three insecticides — lindane, dieldrin, and Sevin — were tested for control of the Douglas-fir cone midge, Contarinia oregonensis Foote (Diptera: Cecidomyiidae). They were applied to infested duff samples at the rate of 1.5 pounds of insecticide in 15 gallons of diesel oil per acre. Lindane was the most effective, causing a 98.5% reduction in the number of midges emerging from the duff. Dieldrin also caused a significant reduction in emergence, but Sevin was no more effective than diesel oil alone.

The results of this test suggest that oil-based sprays applied to the duff before the cone midges emerge might give satisfactory control more consistently than the water-based sprays which are usually applied to the trees. The test procedure would avoid the timing and formulation problems involved in treating developing cones on the trees.

Type
Articles
Information
The Canadian Entomologist , Volume 95 , Issue 6 , June 1963 , pp. 640 - 646
Copyright
Copyright © Entomological Society of Canada 1963

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