Efficacy of novel antifungal molecules against powdery mildew (Erysiphe polygoni DC.) of coriander

The powdery mildew disease of Coriander (Coriandrum sativum L.) is caused by Erysiphe polygoni DC.It has become a serious and widespread problem in most of the region of India, including Rajasthan.In vivo experiment was conducted for three seasons (2017-18 to 2019-20) to investigate the ef icacy of six new molecules, Azoxystrobin 23% SC (0.1%), Propineb 70% WP (0.2%), Tebuconazole 25.9% EC (0.1%), Sulphur 80% WP (0.2%), Hexaconazole 5% SC (0.1%), Propiconazole 25% EC (0.1 %) along with control against coriander powdery mildew on the popular variety RCr-728.Each new generation fungicides were applied twice at 15-day intervals on coriander crop and data on disease intensity and yield were taken 10 days after the last spray.All the new molecule was found effective and minimized the disease severity and increased the yield signi icantly over the control.New molecules fungicides -1 hexaconazole 5% SC (0.1%) was found effective in diminishing the disease (15.27%) and increasing seed yield (15.88 q ha ) -1 compared to 72.06 % disease severity and 11.37 q ha seed yield in the untreated control.The bene it-cost ratio of hexaconazole 5% SC was highest (4.75).The effect of treatments on volatile oil content (%) and test weight was found non-signi icant.