Weather Dependence, Yield Losses, and Control of Bacterial Speck of Tomato Caused by Pseudomonas tomato. H. Yunis, Research Assistant, Department of Plant Pathology and Microbiology, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot 76 100, Israel. Y. Bashan, Assistant, Y. Okon, Lecturer, and Y. Henis, Professor, Department of Plant Pathology and Microbiology, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot 76 100, Israel. Plant Dis. 64:937-939. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-937.

Field weather (temperature and relative humidity) and bacterial speck of tomato were directly correlated. The disease developed and spread only at temperatures between 13 and 28 C and at high relative humidity with free water on the leaves. Yield losses varied from 75% in plants infected at an early stage of growth to 5% in plants infected later in the season. Copper treatments reduced disease severity and increased yield even at optimal conditions for disease development.