If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email firstname.lastname@example.org
Author: McCallum, A. W.
Document Type: Journal Article
Affiliations: Division of Botany and Plant Pathology, Department of Agriculture, Ottawa
Publication date: October 1, 1938