Biology, sampling and control of the Douglas-fir cone gall midge, Contarinia oregonensis Foote (Diptera: Cecidomyiidae), in Douglas-fir seed orchards in British Columbia
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Biology, sampling and control of the Douglas-fir cone gall midge, Contarinia oregonensis Foote (Diptera: Cecidomyiidae), in Douglas-fir seed orchards in British Columbia
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