Cone-Scale Necrosis and Seed Damage Associated with Attacks by Douglas-fir Cone Midges
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
More about this publication?
- Membership Information
- ingentaconnect is not responsible for the content or availability of external websites