Baseline sensitivity and efficacy of fluazinam in controlling Sclerotinia stem rot of rapeseed
2016
Wang, Yong | Duan, Ya-Bing | Zhou, Ming-Guo
Baseline sensitivity of Sclerotinia sclerotiorum to fluazinam was determined using 150 isolates collected during 2011 and 2013 from the rapeseed fields without a previous history of fluazinam usage in Jiangsu province of China. The median effective concentration (EC₅₀) values for fluazinam inhibiting mycelial growth on agar plates ranged from 0.0019 to 0.0115 μg/mL (mean of 0.0069 μg/ml). Neither cross-resistance between fluazinam and carbendazim or dimethachlon was detected. None of the tested isolates displayed reduced sensitivity to fluazinam. On detached rapeseed leaves and pot experiments, fluazinam at 150 μg/ml provided over 80 % control efficacy and exhibited excellent protective activity. In field trials, fluazinam at 187.5 g a.i. ha⁻¹ provided over 70 % control efficacy, higher than other traditional fungicides, suggesting excellent activity against Sclerotinia stem rot (SSR). These results suggest that fluazinam has strong antifungal activity and could be a good alternative fungicide to carbendazim or dimethachlon in controlling Sclerotinia stem rot.
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