University of California

Potentially serious cotton disease angular leaf spot established in California


W. C. Schnathorst
P. M. Halisky

Authors Affiliations

W. C. Schnathorst is Plant Pathologist, Crops Research Division, Agricultural Research Service, United States Department of Agriculture, Davis; P. M. Halisky is Assistant Plant Pathologist, University of California, Davis.

Publication Information

Hilgardia 14(11):5-6. DOI:10.3733/ca.v014n11p5. November 1960.

PDF of full article, Cite this article


Angular leaf spot of cotton is caused by the bacterium—Xanthomonas malvacearum—which enters the plant through wounds or natural openings. Circular translucent lesions on cotyledons, angular lesions on leaves, systemic infection of leaves, stem lesions, and boll rot—all caused by the pathogen—have been observed in California. Yield of cotton may be affected by the disease indirectly, by stunting and premature defoliation of plants, or directly, by loss of bolls due to boll rot.

Schnathorst W, Halisky P. 1960. Potentially serious cotton disease angular leaf spot established in California. Hilgardia 14(11):5-6. DOI:10.3733/ca.v014n11p5
Webmaster Email: wsuckow@ucanr.edu