Sterol-Inhibiting Fungicides for Control of Certain Diseases of Apple in the Cumberland-Shenandoah Region. K. S. Yoder, Assistant Professor of Plant Pathology, Department of Plant Pathology and Physiology, Virginia Polytechnic Institute and State University Fruit Research Laboratory, Winchester 22601. K. D. Hickey, Professor of Plant Pathology, Department of Plant Pathology, Pennsylvania State University Fruit Research Laboratory, Biglerville 17307. Plant Dis. 65:998-1001. Accepted for publication 14 May 1981. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-998.

Certain sterol-inhibiting fungicides were field-tested against apple scab, rusts, and several summer diseases of apple in Pennsylvania and Virginia. Most of these compounds provided outstanding control of scab and rusts, weak control of summer diseases, and allowed adequate fruit finish. Exceptions were poorer rust control by prochloraz, better control of sooty blotch by bitertanol, and a consistent russeting of Golden Delicious fruit by fenapanil.