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Cone-Scale Necrosis and Seed Damage Associated with Attacks by Douglas-fir Cone Midges

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Abstract:

Premature cone-scale necrosis was shown to follow, if not to result directly from attack of the Douglas-fir cone midge. This insect, which causes galls early in seed development, also appears adversely to affect the number of sound seed maturing. But cone-scale necrosis did not harm the germinability of the sound seed that survived; nor did it materially alter the normal change in reducing sugar-content associated with seed maturation. Contarinia washingtonensis was also shown to cause damage to Douglas-fir (Pseudotsuga menziesii) seed, but was normally of less consequence than that resulting from attack by C. oregonensis.

Document Type: Journal Article

Affiliations: Forest Entomologist, Weyerhaeuser Company Forestry Research Center, Centralia, Wash.

Publication date: March 1, 1963

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