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A Powdery Mildew of Chilli Caused by Oidiopsis sp.. C. H. Blazquez, Associate Professor (Associate Plant Pathologist), University of Florida, IFAS, Agricultural Research Center, Immokalee 33934; Phytopathology 66:1155-1157. Accepted for publication 20 February 1976. Copyright © 1976 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-66-1155.

Powdery mildew of chilli (Capsicum annuum) was present in Lee, Collier, and Hendry Counties of southwest Florida in December 1971, and the causal agent was Oidiopsis sp. Chlorotic and necrotic spots of the leaves, branch die-back, and dwarfing were the main symptoms, which were followed by pod drop. The pathogen was not observed in any other plant parts. Most nonpungent pepper plants were resistant to the disease. This is the first report of the occurrence of the disease on chilli on the North American continent.

Additional keywords: obligate parasite, manganese deficiency.