Detection for the Resistance of Fusarium spp. Isolated from Rice Seeds to Prochloraz and Cross-resistance to Other Fungicides Inhibiting Sterol Biosynthesis

Abstract

To assess the resistance to prochloraz, values of Fusarium isolates obtained from rice seed were investigated through the agar dilution method. value of 36 isolates of Fusarium spp. to prochloraz ranged from 0.020 to with an average of . According to the species of Fusarium, the average value was fluctuated; for F. moniliformis, for F. proliferatum and for F. fujikuroi. The resistant baseline was decided at to determine if the isolate was resistant to prochloraz or not. Based on the resistant baseline, the ratio of resistant isolates was 14%. There was no correlation between the resistance to prochloraz and the pathogenicity of Fusarium spp. on rice seedlings. The resistant isolates of F. fujikuroi did not show the cross-resistance to other sterol biosynthesis inhibiting fungicides, triflumizole, hexaconazole, difenoconazole and tebuconazole.