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Experimental analysis reveals uniform distribution of dimethoate in Douglas-fir trees, suggesting effective pest protection.
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-P 32 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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Rediske et al. (1970) studied this question.
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