Influence of Acephate and Oxamyl on Alternaria panax and on Alternaria Leaf Spot of Schefflera. L. S. Osborne, Assistant Professor of Entomology, University of Florida, IFAS, Agricultural Research and Education Center, Apopka 32703. A. R. Chase, Associate Professor of Plant Pathology, University of Florida, IFAS, Agricultural Research and Education Center, Apopka 32703.. Plant Dis. 68:870-872. Accepted for publication 4 April 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/PD-68-870.

Growth of Alternaria panax was reduced significantly on agar media amended with oxamyl but not on that amended with acephate. Acephate or oxamyl sprays applied to leaves of schefflera (Brassaia actinophylla) 24 hr before inoculation with conidia of A. panax reduced severity of disease. Control of Alternaria leaf spot by oxamyl compared favorably with control by mancozeb, mancozeb + thiophanate-methyl, zineb, or iprodione.

Keyword(s): phytotoxicity.