In vitro efficacy of various fungicides against A. candida causing mustard white rust disease

Abstract

Among seven systemic fungicides evaluated in vitro against A. candida, Metalaxyl 35% SD was most effective at both 500 and 750 ppm, with significantly highest sporangial germination inhibition of 72.62% and 76.94%, followed by Hexaconazole 5% EC (70.60% and 74.20%, respectively) and Difenoconazole 25% EC (68.52% and 71.92%, respectively), However, Thiophanate methyl 75% WP and Fosetyl-Al 80% WP were the least effective. Among the contact and combi-fungicides evaluated in vitro, Metalaxyl 4% + Mancozeb 68% WP resulted with highest sporangial germination inhibitions of 84.84% and 86.79%, respectively at 2000 ppm and 2500 ppm. The contact fungicide, Chlorothalonil 75% WP resulted with highest sporangial germination inhibition of 81.61% and 85.10%, respectively at 2000 ppm and 2500 ppm. Rest of the contact and combi-fungicides showed considerable inhibition of sporangial germination, over untreated control.