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Distribution of Dimethoate-P32 In Douglas-Fir Following Stem Injection

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Stem injection appears promising as a means of applying dimethoate to orchard Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) trees for protection of seed crops from insect attack. Radioautograms and tracer analyses showed breast-height injection of two young trees with dimethoate-P32 was followed by the material's uniform distribution through most of the upper third of the crown. Lateral displacement of the injection stream in the rest of the crown was negligible in one tree, and 180 degrees in the other. In the cones, radioautograms showed dimethoate to be well distributed throughout the cortical tissue. Studies of dimethoate degradation in the needles showed the systemic to have an apparent half-life of 10 days. Forest Sci. 16:106-112.
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Keywords: Pseudotsuga menziesii; Systemic insecticide; cone and seed insects

Document Type: Journal Article

Affiliations: Supervisor, Southern Forestry Research, Southern Forestry Research Center, New Bern, North Carolina

Publication date: 1970-03-01

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    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.

    2016 Impact Factor: 1.782 (Rank 17/64 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
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