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Tests of Guthion and Dimethoate for Douglas-Fir Cone Midge Control

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In 1964 Guthion&sup(R); and dimethoate were tested for cone and seed insect control on Pseudotsuga menziesii (Mirb.) Franco. Each chemical was applied to ten trees when the conelets were open and receptive to pollen. A third sample of ten trees received dimethoate after the cones had closed and become pendant. A fourth sample of ten unsprayed trees served as controls. Significantly fewer midges, less midge damage and fewer seed chalcids were observed in cones from trees given the late dimethoate treatment when compared to controls. The other two treatments, however, did not produce significant results. Late insecticide treatments, made after midge oviposition is completed, have the great advantage of eliminating timing as a critical factor.

Document Type: Journal Article

Affiliations: Forest Entomologist, Forestry Research Center, Weyerhaeuser Company, Centralia, Wash.

Publication date: 1966-06-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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