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Chemicals Plus Heat as Seed Treatments for Control of Angular Leaf Spot of Cucumber Seedlings. Curt Leben, Department of Plant Pathology, Ohio Agricultural Research and Development Center, Ohio State University, Wooster 44691. Plant Dis. 67:991-993. Accepted for publication 15 March 1983. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-991.

Control of disease in seedlings was obtained by treating cucumber seeds for 20 min in aqueous preparations (50 C) of calcium propionate or tartaric acid, each at 33 g/L, or with acidic cupric acetate at 50 g/L. Seeds had been vacuum-inoculated with Pseudomonas syringae pv. lachrymans. Seed germination was not affected by chemical-heat treatments. Tests were conducted in the growth room and a field trial. Disease control also was obtained in growth room tests when inoculated seeds were treated 20 min with cupric acetate in 95% ethanol at 50 C.