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Filtering by: Creator Sisson, Warren Elmer, Jr.

Cambial divisions in Pseudotsuga menziesii

Creator:

Sisson, Warren Elmer, Jr.

Abstract:

Mitotic activity in the vascular cambium was determined from ten samples from a single internode in each of four Douglas-fir [(Pseudotsuga menziesii (Franco.) Mirb.)]trees. Counts of interphase and mitotic nuclei from nine cores in each sample piece were averaged and expressed as the frequency and mitotic index. The sampling error...

Resource Type:

Masters Thesis
Effects of the balsam woolly aphid (Adelges piceae (Ratzburg)) on the cambial activity of grand fir (Abies grandis (Dougl.) Lindl.) and subalpine fir (Abies lasiocarpa (Hook.) Nutt.)

Creator:

Sisson, Warren Elmer, Jr.

Abstract:

Cambial activity was studied in trees infested by the balsam woolly aphid and in non-infested trees of grand and subalpine fir. Infested and non-infested samples of grand fir were collected near Corvallis during 1968 and 1969. Samples of subalpine fir, noninfested and infested, were collected near Odell Lake, at approximately...

Resource Type:

Dissertation