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Filtering by: Date issued sim 1964-05-14 Degree Field Botany Rights Statement Copyright Not Evaluated

Interrelationships between fungi associated with the damping-off disease of table beets in Oregon

Creator:

Lin, Shu-yen

Abstract:

Damping-off of table beets is of widespread occurrence in the Willamette Valley of Oregon. Pythium ultimum Trow., Pythium debaryanum Hess., and Rhizoctonia solani Kuhn. were found to be the important pathogenic fungi causing the disease. Trichoderma viride, Penicillium spp. Streptomyces spp. and certain isolates of bacteria, all saprophytic organisms associated...

Resource Type:

Masters Thesis
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