Powdery mildew control with benomyl for greenhouse-grown snapdragons

Abstract

Powdery mildew is a common and serious disease in home garden and commercial (greenhouse and field) plantings of orna-mentals. Control of powdery mildew on greenhouse snapdragons with the systemic fungicide benomyl has been successful when the fungicide has been sprayed on the foliage, drenched into the soil at three-week intervals, or mixed in the soil prior to planting. Definite systemic action has resulted either from drench applications around growing plants or mixing the fungicide in the soil prior to planting. When mixed in the soil prior to planting, the effectiveness has lasted nine and a half months following addition and about seven and a half months following planting. Benomyl (Benlate) is not yet registered for use on snapdragons or other ornamentals.