Sterol-Inhibiting Fungicides for Control of Certain Diseases of Apple in the Cumberland-Shenandoah Region

Abstract

Certain sterol-inhibiting fungicides were field-tested against apple scab [Venturia inaequalis], rusts [Gymnosporangium juniperi-virginianae] 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 [Gloeodes pomigena] by bitertanol, and a consistent russeting of Golden Delicious fruit by fenapanil.