Frequency distribution of sensitivity of Ustilaginoidea virens to four EBI fungicides, prochloraz, difenoconazole, propiconazole and tebuconazole, and their efficacy in controlling rice false smut in Anhui Province of China
Frequency distribution of sensitivity of Ustilaginoidea virens to four EBI fungicides, prochloraz, difenoconazole, propiconazole and tebuconazole, and their efficacy in controlling rice false smut in Anhui Province of China
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DOI：
10.1007/s12600-013-0288-y
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发表时间：
2013-07-01
期刊：
影响因子：
1.4
通讯作者：
Gao, Tong-Chun
中科院分区：
文献类型：
--
作者：
Chen, Yu;Zhang, Yong;Gao, Tong-Chun
稻曲病是由稻曲病菌（Ustilaginoidea virens）引起的一种重要的水稻新病害。在中国目前，在我国大部分水稻生态区，特别是安徽省，大多数高产优质品种都对稻曲病感病甚至高感，因此，药剂防治是防治稻曲病的重要措施。麦角甾醇生物合成抑制剂（EBI）类杀菌剂咪鲜胺、苯醚甲环唑、丙环唑和戊唑醇在我国广泛用于防治水稻纹枯病和稻瘟病。在本研究中，共有102个U。在菌丝生长阶段测定了来自中国安徽省的10个绿僵菌菌株对这4种EBI杀菌剂的敏感性。咪鲜胺、苯醚甲环唑、丙环唑和戊唑醇对102 U.毒力分别为0.04-0.75、0.04-1.08、0.04-0.38和0.03-0.57 μ gml（-1），平均EC 50值分别为0.32 ± 0.08、0.45 ± 0.08、0.19 ± 0.03和0.21 ± 0.06 μ gml（-1）。这些值表明，测试的U。virens菌株对这4种EBI杀菌剂非常敏感。田间药效试验结果表明，3种杀菌剂2次喷雾对稻曲病的防治效果均优于1次喷雾。每种药剂喷2次比喷1次对水稻纹枯病的防治效果好。50%丙环唑乳油喷雾两次，300 g a.i.在2010和2011年连续两年，ha（-1）对两个地点的稻曲病的防效最好，防效为71.5%至74.3%。场的灵敏度U。应监测病毒分离株对EBI杀真菌剂的敏感性。应测试混合物以及与具有不同作用模式的其他杀真菌剂交替使用。
False smut, caused by Ustilaginoidea virens, is an important emerging disease of rice (Oryza sativa L.) in China. Up to now, as most varieties with high yielding and good quality are susceptible or even highly susceptible to false smut in most rice-growing ecological regions, especially in Anhui Province, chemical control with fungicides would be an important measure for the control of this disease. The ergosterol biosynthesis inhibitor (EBI) fungicides, such as prochloraz, difenoconazole, propiconazole and tebuconazole, are extensively used in China for the control of rice diseases, such as rice sheath blight and rice blast. In this study, a total of 102 U. virens isolates (from Anhui Province of China) were tested for their sensitivity to these four EBI fungicides during the stage of mycelial growth. The EC50 ranges of values for prochloraz, difenoconazole, propiconazole and tebuconazole inhibiting mycelial growth of the 102 U. virens isolates were 0.04-0.75, 0.04-1.08, 0.04-0.38 and 0.03-0.57 mu gml(-1), with the average EC50 values of 0.32 +/- 0.08, 0.45 +/- 0.08, 0.19 +/- 0.03 and 0.21 +/- 0.06 mu gml(-1), respectively. These values suggested that the tested U. virens isolates were very sensitive to these four EBI fungicides. Results of field trials showed that two sprays of three of the fungicides exhibited greater control efficacy than a single spray for the control of rice false smut. Two sprays of each was better than a single spray for the control of rice sheath blight. Two sprays of 50% propiconazole EC at 300 g a.i. ha(-1) gave the best control of rice false smut at both two sites during the two consecutive years, 2010 and 2011, with the control efficacy ranging from 71.5 to 74.3%. Sensitivity of the field U. virens isolates to EBI fungicides should be monitored. Mixtures, as well as alternation with other fungicides with different modes of action, should be tested.