Abstract
A test of control effects on rot of onion bulbs during storage in the summer season was made by applying several kinds of fungicides to onion leaves infected by Phytophthora porri and Peronospora destructor during the growing season. The rot of onion bulbs decreased more by two applications of mancozeb prior harvest than by the same amount of chlorothalonil (TPN). The most effective results were obtained by four applications of mancozeb and three of zineb during the growing season, and by four applications of ridomil at the early part of the growing season.
