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Filtering by: Creator Doerksen, Allan Harold Date issued sim 1964-05-14 Degree Field Botany Subject Fir -- Diseases and pests

The effects of balsam woolly aphid infestations on wood anatomy of true firs

Creator:

Doerksen, Allan Harold

Abstract:

Three species of true firs in the Pacific Northwest--Abies gran-dis, grand fir; A. amabilis, Pacific silver fir; and A. lasiocarpa, subalpine fir--are severely damaged or killed by an imported insect pest, the balsam woolly aphid (Chermes (Adelges) piceae Ratz.), Infestations of this insect cause abnormalities in the wood and, in...

Resource Type:

Masters Thesis