Assessment of yield losses in cultivars against powdery mildew disease (Erysiphe polygoni DC) of coriander (Coriandrum sativum L.)

Abstract

Coriander (Coriandrum sativam L.) is one of the most important spice crops in India. The major constraints for low productivity are several biotic stresses. The powdery mildew disease caused by Erysiphe polygoni DC is one of the most destructive diseases of coriander causing severe losses yield in India. In present investigation, the assessment of yield losses due to Erysiphe polygoni was carried out in a spray schedule trial, in which losses in yield and intensity of disease were estimated. The corresponding yield was worked out further a regression equation was developed to predict the losses due to unit increase in diseases intensity A highly significant and negative correlation (r = -0.99**) was obtained in between the disease intensity and yield, indicates that yield of coriander gradually decreases with the corresponding increase in the diseases intensity.