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Evaluation of four chemical insecticides registered for control of the Douglas-fir cone gall midge, Contarinia oregonensis (Diptera: Cecidomyiidae), and the Douglas-fir seed chalcid, Megastigmus spermotrophus (Hymenoptera: Torymidae), in Douglas-fir seed orchardsSTEIN, J. D; MARKIN, G. P.Canadian entomologist. 1986, Vol 118, Num 11, pp 1185-1191, issn 0008-347XArticle

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