Journal of Phytopathology
Journal of Phytopathology
5 years ago

Sensitivity to boscalid in field isolates of Sclerotinia sclerotiorum from rapeseed in Henan Province, China

Liuyuan Fu, Shengming Liu, Genqiang Chen, Fei Hai, Zhiping Che, Yuee Tian, Jia Jiang
Sclerotinia stem rot caused by Sclerotinia sclerotiorum is an important disease of oilseed rape in Henan province of China. Boscalid belongs to succinate dehydrogenase inhibitor (SDHI) fungicides, many of which have strong antifungal activity against S. sclerotiorum. In 2015, a total of 175 isolates of S. sclerotiorum were collected from diseased oilseed rape plants in seven different regions of Henan Province. The EC50 values of 175 isolates of S. sclerotiorum to boscalid ranged from 0.0073 to 0.3880 μg ml−1, and the mean EC50 value was 0.15 ± 0.09 μg ml−1. The frequency distribution was unimodal. There was no cross-resistance between boscalid and carbendazim, procymidone, iprodione, dimethachlone, fludioxonil or fluazinam. Field experiments showed that control efficacies of treatments with boscalid (50% WG) at 225, 300 and 375 g ai ha−1 were 71%, 81% and 90%, respectively. In contrast, the control efficacy of carbendazim (50% WP) at 1,500 g ai ha−1 was only 52%.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1111/jph.12679

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