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《Journal of Plant Protection》 2018-02
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Synergistic interaction and field control effect of mixtures of thifluzamide with azoxystrobin against Rhizoctonia solani

Meng Runjie;Wang Wenqiao;Wu Jie;Han Xiuying;Zhou Dawei;Ning Zhaoyu;Key Laboratory of Integrated Pest Management on Crops in Northern Region of North China, Ministry of Agriculture,IPM Center of Hebei Province;Plant Protection Institute, Hebei Academy of Agricultural and Forestry Sciences;Shaanxi Sunger Road Bio-Science Company Limited;  
In order to elucidate synergism against Rhizoctonia solani using the mixtures of thifluzamide with azoxystrobin and to control disease of potato black scurf in the field, the joint-toxicity of the mixtures of the two fungicides against R. solani was examined through the mycelial growth rate assay and the field trials on the controlling efficacy was conducted. The synergism of the mixtures was assessed with the method of Wadley formula and Abbott formula, respectively. The control effects of the mixtures against potato black scurf were treated in field trials of seed dressing, furrow application and spraying to the stem base of seedlings on controlling efficacy against potato black scurf. The results showed that the synergistic ratios of the mixtures of thifluzamide with azoxystrobin at the ratios of 3∶1,2∶1, 1∶1 and 1∶2 were 1.7, 2.7, 2.5, and 1.9, respectively. The mixtures of thifluzamide with azoxystrobin at the ratios of 2∶1 and 1∶1 exhibited the more obvious synergistic interaction. The furrow application of tank mixture of thifluzamide 240 g/L SC with azoxystrobin 250 g/L SC at the ratio of 1∶1 at the rate of 240 g(a.i.)/hm~2 gave higher control efficacy than seed dressing and spraying to the stem base of seedlings and exhibited synergistic interaction with synergistic ratio of 1.1, the control efficacies against potato black scurf in potato stems and tubers by furrow application were 65.3% and 71.6%,respectively. It indicated that the furrow application of tank mixture of thifluzamide 240 g/L SC with azoxystrobin 250 g/L SC at the ratio of 1∶1 at the rate of 240 g(a.i.)/hm~2 could be more effectively for the control of potato black scurf.
【Fund】: 国家公益性行业(农业)科研专项(201303018);; 国家重点研发计划(2016YFD0200503);; 边远贫困地区、边疆民族地区和革命老区人才支持计划科技人员专项计划
【CateGory Index】: S435.32
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