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IntensIve sIlvIculture - Forest Science Labs - Research Network ...

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tree/stand health<br />

253<br />

Abstract: The control of Contarinia oregonensis and Megastigmus spermotrophus on<br />

Douglas fir (Pseudotsuga menziesii) in Washington and Oregon in 1982 and 1983 depended on<br />

the levels of infestation and which of 4 insecticides was used. There was no significant reduction<br />

in infestation of either pest when acephate was applied. Oxydemeton-methyl (by spray or<br />

injection) and dimethoate (in sprays) significantly reduced damage by C. oregonensis. These<br />

three compounds and azinphos-methyl were ineffective against M. spermotrophus for infestations<br />

affecting

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