Greasy Canker of Poinsettia Caused by Pseudomonas viridiflava. T. V. Suslow, Research Specialist, University of California, Berkeley 94720. A. H. McCain, Extension Plant Pathologist, University of California, Berkeley 94720. Plant Dis. 65:513-514. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-513.

A strain of Pseudomonas viridiflava was the causal agent of a previously undescribed canker, leaf spot, and bud and bract blight of poinsettia (Euphorbia pulcherrima Willd.). The canker was associated with wounds and was favored by high temperature (28–32 C) and high relative humidity.