Protective Activity of 1-Hydroxyethylphosphinic Acid and Related Compounds against Downy Mildew and Phytophthora Blight on Cucumber and Late Blight on Potato

Abstract

1-Hydroxyethylphosphinic acid, its esters and salts were found to be effective against downy mildew on cucumber both in a foliar spray test and in a soil drench test. These compounds showed not only preventive activity but also curative activity. They were also effective against late blight on potato and phytophthora blight on cucumber. Among them, Ca (II) and A1 (III) salts of the acid seemed most promising from the viewpoints of higher antifungal potency and lower phytotoxicity. © 1988, Pesticide Science Society of Japan. All rights reserved.