Selection of Fungicides in Controlling Wheat Sharp Eyespot Caused by Rhizoctonia cerealis

The test showed that the triazole fungicides hexaconazole and tebucolazole posessed much higher inhibitory activity against mycelial growth of Rhizoctonia cerealis than carbendazim,thiophanate-methyl,carboxin,azoxystrobin,prochloraz,SYP-Z048,validmycin,toclofos-methyl,quintozene,hymexazol,thiram,chlorothalonil,propineb,mancozeb; hexaconazole 5% ME,tebuconazole 12.5% ME,and Amistar 25% SC exhibited higher inhibitory activity againt R.cerealis infecting wheat seedings than carbendazim 50% WP,thiophate-methyl 70% WP,toclofos-methyl 20% EC,validmycin 5% SP,Vitavax 200FF,Daconil 40% SC,propiconazole 25% EC,flusilazole 40% EC,difenoconazole10% WP,and thiram 50% WP;Synergistic interaction exsited between thiram and hexaconazole,1∶10 is the optimal ratio of mixing.600-1 200-fold suspension of 44% hexaconazole-thiram WP prepared at the optimal ratio didn′t inhibit the growth of wheat and delay the emergence of wheat seedlings with wheat seeds soaked in suspension of 44% hexaconazole-thiram WP or with the surface of soil sprayed by suspension of 44% hexaconazole-thiram WP.