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 efficacy 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 significantly over the control. New
molecules fungicides 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 -1 seed yield in the untreated control. The benefit-cost ratio of
hexaconazole 5% SC was highest (4.75). The effect of treatments on volatile oil content (%)
and test weight was found non-significant.