Effect of Insecticides, Nutrients, and Adjuvants on In Vitro Fungistatic and Fungicidal Activity of Captan and Mancozeb. W. H. Gradis, Former Graduate Research Assistant, Department of Plant Pathology, North Carolina State University, Raleigh 27650. T. B. Sutton, Assistant Professor, Department of Plant Pathology, North Carolina State University, Raleigh 27650. Plant Dis. 65:356-358. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-356.

The in vitro effect of phosmet, methomyl, azinphosmethyl, calcium nitrate, sodium borate, and a spreader-sticker on the fungicidal activity of captan and mancozeb was investigated by using a cellophane transfer technique. Spore germination and germ tube length of conidia of Botryosphaeria dothidea and Glomerella cingulata were used to measure fungitoxic properties of the chemicals. The fungistatic and fungicidal activity of mancozeb was reduced by the addition of phosmet and azinphosmethyl, and that of captan was reduced by the addition of sodium borate, phosmet, or azinphosmethyl.