Notes: Insect Damage to Noble Fir Seed and the Feasibility of Protecting Cone Crops in Natural Stands
Abstract:Insect damage to noble fir cone crops was monitored for 3 years at two sites and 2 years at one site in western Washington. Levels of insect damaged seed ranged from 9 to 75 percent. Major pests were seed midges, seed maggots, and a chalcid. Ovipositional activity by seed destroying insects was concentrated when female strobili have just closed after pollination in late June and early July. No increase in insect damage occurred during the 2-month after-ripening period following cone harvest. Trunk implants of acephate reduced insect damage but increased the amount of empty seed. Results suggested insect damage masks even higher levels of empty seed. Objects observed in the micropyle of young female cones could play a role in the formation of empty seed. Forest Sci. 29:112-116.
Document Type: Miscellaneous
Affiliations: Western Forestry Research Center, Weyerhaeuser Company, 505 N. Pearl Street, Centralia, WA 98531
Publication date: March 1, 1983
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