Abstract
Seasonal patterns of cone and seed insect activity and seed loss relative to cone production and weather patterns were examined over a 3-yr period in a Douglas-fir, Pseudotsuga menziesii (Mirbel) Franco, seed orchard in western Oregon. Six insect species showed distinct patterns of occurrence and cone or seed damage during this period. A weevil, Lepesoma lecontei (Casey); the Douglas-fir cone gall midge, Contarinia oregonensis Foote; and two lepidopterans, Barbara colfaxiana Kearfott and Dioryctria abietivorella (Grote), damaged cones or seed exposed during late April each year. The Douglas-fir seed chalcid, Megastigmus spermotrophus Wachtl, damaged seed in cones exposed during May and June; western conifer seed bug, Leptoglossus occidentalis Heidemann, was most damaging in cones exposed July-August.
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