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威百亩对西葫芦常见土传病原菌的毒力及田间防效

, PP. 562-568

Keywords: 威百亩,1,3-二氯丙烯,土传病原菌,毒力,田间防效

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Abstract:

为明确威百亩对西葫芦常见土传病原菌的活性及田间防治效果,以1,3-二氯丙烯为对照药剂,采用改进的密封盘法比较了2种熏蒸剂对西葫芦菌核病菌等4种病原菌的毒力及对菌核萌发的影响,并于田间采用密闭熏蒸法比较了2种药剂对西葫芦茎基腐病的防治效果.室内结果显示:威百亩对西葫芦菌核病菌、茎基腐病菌、枯萎病菌及绵腐病菌的EC50分别为0.060、0.945、1.380、2.953mg/L,而1,3-二氯丙烯对这4种病原菌的EC50为516.654、928.558、633.784、77.242mg/L,威百亩0.228mg/L可完全抑制菌核的萌发.田间药效试验表明:威百亩150、90、75、60kg/hm2及1,3-二氯丙烯200kg/hm2均能不同程度控制西葫芦茎基腐病的发生,防治效果分别为88.94%、87.58%、83.76%、80.60%和64.80%,且各试验剂量均对西葫芦安全并能在一定程度上起到增产作用,威百亩150kg/hm2处理增产率最高,达34.82%.从防治效果及经济效益分析,在西葫芦田推荐使用威百亩防治土传病害.

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