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广西烟草黑胫病菌对甲霜灵的敏感性检测
作者: 朱桂宁1  贤小勇1  黄福新1  秦碧霞1  周兴华2  李其星3  韦学平4  冉德辉5  林珊宇1  
单位: (1 广西农业科学院植物保护研究所  南宁 530007;2 广西烟草专卖局烟叶管理处  南宁 530023;3 广西烟草公司德保分公司  广西德保 533700;4 广西烟草公司百色市烟草科研所  广西百色 533800;5 广西烟草公司隆林分公司  广西隆林 533400)  
关键词: 烟草黑胫病菌  甲霜灵  敏感性  广西  
分类号:S435.72
出版年,卷(期):页码:2011 ,42 ( 6 ): 页码:623-620
摘要:

【Objective】The present experiment was conducted to study the sensitivity of Phytophthora parasitica var. nicotianae to metalaxlyl in Guangxi in order to apply the proper control measures for its spread. 【Method】Sensitivity of 196 Phytophthora parasitica var. nicotianae strains isolated from the main tobacco areas of Guangxi to metalaxlyl was tested by observing the growth rate of fungal strains. 【Result】EC50 values of 196 isolates ranged from 0.0691 to 1.0243 μg/mL, and the mean EC50 value was 0.3618±0.0297 μg/mL. The isolate TL05 from Tianlin County was the most sensitive one, with the EC50 value of 0.0691 μg/mL, while the isolate ZXHD12 from Huadong Town, Jingxi County was the most resistant, with the EC50 value of 1.0243 μg/mL. A significant difference among the sensitivities of isolates from different sites has been observed. The isolates from Nandan and Tianlin County were the most sensitive, while those from Longlin, Jingxi, Debao and Fuchuan County were the most resistant. The frequencies of sensitive, intermediate and resistant isolates to metalaxyl were 1.53, 66.84 and 31.63%, respectively. 【Conclusion】A low level of resistance to metalaxyl has been observed in Phytophthora parasitica var. nicotianae in Guangxi. It is, therefore, suggested that metalaxyl should be alternated with other fungicides for proper control of the tobacco black shank.

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