Common Ragweed: A New Host of Pseudomonas syringae pv. tagetis. D. J. Styer, Research Assistant, Department of Plant Pathology, University of Wisconsin, Madison 53706. R. D. Durbin, Research Leader, Plant Disease Resistance Research Unit, ARS, USDA, and Professor, Department of Plant Pathology, University of Wisconsin, Madison 53706. Plant Dis. 66:71. Accepted for publication 22 September 1981. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1982. DOI: 10.1094/PD-66-71.

Pseudomonas syringae pv. tagetis, the causal agent of marigold leaf spot, has been found in several regions of Wisconsin infecting common ragweed, Ambrosia artemisiifolia. The symptoms consist of leaf spots surrounded by chlorotic halos and apical chlorosis.

Keyword(s):