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A Simple Method for Determining Efficacy and Weatherability of Fungicides on Foliage. W. H. Ko, Associate Professor, Department of Plant Pathology, University of Hawaii, Beaumont Agricultural Research Center, Hilo 96720; Hsin-hsiung Lin(2), and R. K. Kunimoto(3). (2)(3)Research Associates, respectively, Department of Plant Pathology, University of Hawaii, Beaumont Agricultural Research Center, Hilo 96720, (2)Present address: Taiwan Federation of Fruit Marketing Cooperatives, Taipei. Phytopathology 65:1023-1025. DOI: 10.1094/Phyto-65-1023.

Efficacy of fungicides was determined directly by observing with a vertical-illumination microscope the germination of fungal spores on detached leaves sprayed with various concentrations of fungicides. Weatherability of a fungicide under field conditions was studied by measuring spore germination on leaves at various time intervals after fungicide application. This simple and rapid technique should prove useful for determining fungitoxicity of chemicals on host tissues in a primary screening program, and for studying retention of fungicide deposits under field conditions.