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Filtering by: Creator Callihan, R. H. (Robert Harold), 1933-

The hard seed mechanism in Convolvulus arvensis L. and the influence of environmental variables upon germination

Creator:

Callihan, R. H. (Robert Harold), 1933-

Resource Type:

Masters Thesis
Physiological and agronomic response of potato periderm russeting to measures for control of common scab

Creator:

Callihan, R. H. (Robert Harold), 1933-

Abstract:

Management factors used for studies on potato scab control were evaluated for their effect on tuber russeting and related biochemical and anatomical parameters during 1971 and 1972. Russet Burbank potatoes were irrigated in 1971 to maintain high available soil moisture (between 90% and field capacity) for 0, 3, 6 and...

Resource Type:

Dissertation
Tansy Ragwort, Senecio jacobaea L. [1997]

Creator:

Oregon State University. Extension Service, Washington State University. Extension, University of Idaho. Extension, Mallory-Smith, C., Burrill, L. C., Callihan, R. H. (Robert Harold), 1933-, Parker, R., Radtke, H., Pacific Northwest Cooperative Extension, and Coombs, Eric M.

Abstract:

Revised July 1997. Reprinted January 2001. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog

Resource Type:

Technical Report
Poison oak and poison ivy : Rhus diversiloba T. & G. and Rhus radicans L.

Creator:

Burrill, L. C., Callihan, R. H. (Robert Harold), 1933-, Parker, Robert, 1941-, Washington State University. Cooperative Extension, and Pacific Northwest Cooperative Extension

Abstract:

Poison oak is common in western Oregon and Washington. Its near relative, poison ivy, is found in eastern Oregon and Washington, throughout Idaho, and eastward. Both plants are native to the Pacific Northwest.

Resource Type:

Technical Report