Field Evaluadon of Fenarimol and Triadimefon for Control of Powdery Mildew (Erysiphe Polygoni Dc.) of Pea

Field trials were conducted at the Central Plant Protection Training Institute farm for three years (1989–1991) for the control of powdery mildew of pea caused by Erysiphe polygoni DC. on the commonly grown cultivar Bonl1eviile. Carbenndazim (0.1%), dioncap (0.05%), fenarimol (0.045%) and (0.06%), triadimefon (0.025%) and (0.04%,) and wettable sulphur (0.3%) were tested along with an untreated control in.. a randomized block design. Two sprays of eithler triadimef on (0.04%) or fenarimol (0.06%) were very effective for disease contro as well as increasing the green pod yield. These were followed by dinocap and wettable sulphur which were intermediate and carbendazim was least effective. The cOot benefit ratio was in the order of wettable sulphur (1:12.5) >- triadimefon (0.025%) (1:12.4) >- dinocap (1:11.8)>-triadimefon (0.04%) (1:9.0) and carbendazim (1:2).