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《Journal of Plant Protection》 2018-02
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Biological characteristics of Rhizoctonia cerealis isolates with different sensitivities to triadimefon and their sensitivity to different fungicides

Xu Jianqiang;Zhao Jianjiang;Hu Xuehan;Wu Yayun;Yang Gaifeng;Fan Qianqian;College of Forestry, Henan University of Science and Technology;Plant Protection Institute, Hebei Academy of Agricultural and Forestry Sciences;  
In order to forecast the resistance development of Rhizoctonia cerealis to triadimefon, the sensitivities of 98 isolates to triadimefon isolated in 2013 from 16 cities in Henan Province were determined by mycelial growth rate method; biological characteristics of the isolates with different sensitivities to triadimefon were studied, and the sensitivities of 22 isolates to ten other fungicides were also determined. The subpopulation with less sensitive to triadimefon was discovered in the tested isolates. The mean EC_(50) value of 1.91 μg/mL for 90 isolates showed a unimodal curve distribution, which was treated as the sensitive baseline of R. cerealis to triadimefon. The sensitive isolates had higher survival fitness,which implied that their mycelia grew faster with 8.50-12.86 mm/d, and they could produce more sclerotia with 35.80-42.90 mg per dish. Both the mycelia growth rate(5.36-10.02 mm/d) and sclerotium dry weight(9.00-36.90 mg per dish) of slightly sensitive and resistant strains were lower, indicating that the resistant strains had lower survival fitness, though their pathogenicity and the sclerotium germination did not change. The number of hyphal tip branching of slightly resistant isolates was greater than that of sensitive isolates, but the length of the branched hypha was less than that of sensitive isolates.The EC_(50) value of triadimefon to R. cerealis was greater than those of ten other fungicides, suggesting that the virulence of triadimefon was weaker. The virulence of tebuconazole, epoxiconazole, diniconazole, fludioxonil and thifluzamide was stronger, as their EC_(50) values were less than or equal to 0.10 μg/mL.The EC_(50) value of five other fungicides varied from 0.13 μg/mL to 0.69 μg/mL. Moreover, the determination coefficients existing between triadimefon and ten other fungicides ranged from 0.003 to 0.200,showing that there was a weak cross resistance and the ten fungicides could be used to control wheat sharp eyespot as an alternative of triadimefon.
【Fund】: 国家公益性行业(农业)科研专项(201303023);; 国家自然科学基金(31401774);; 河南科技大学大学生研究训练计划(2015148)
【CateGory Index】: S435.121.4
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