6种杀菌剂对建兰茎腐病原菌尖孢镰刀菌的毒力及联合作用
摘要：为筛选出对建兰茎腐病防效好的增效混剂，室内测定6种杀菌剂对建兰茎腐病原菌尖孢镰刀菌的毒力及其联合作用。结果表明：6种杀菌剂对建兰茎腐病原菌尖孢镰刀菌均有不同程度的抑制作用，抑制中浓度EC50的由小到大依次为：咪鲜胺、苯醚甲环唑、多菌灵和肟菌酯、噁霉灵和代森锰锌；设定的4组混剂配方，苯醚甲环唑+多菌灵、多菌灵+肟菌酯混配表现为增效作用，苯醚甲环唑+多菌靈混配的最佳有效成分质量配比为5∶5，共毒系数为37863；多菌灵+肟菌酯混配的最佳配比则为8∶2，共毒系数为24780。可见，苯醚甲环唑+多菌灵和多菌灵+肟菌酯合理比例混配能较好防控建兰茎腐病的发生为害。
关键词：建兰；茎腐病；杀菌剂；毒力测定；联合作用
中图分类号：S 4368；S 4822 文献标识码：A文章编号：1008-0384（2018）04-396-05
Individual and Incombination Toxicities of Six Fungicides for Controlling Fusarium oxysporum on Cymbidium ensifolium
HUANG Peng1，CHEN Feng1，YAO Jinai1，2，YU Deyi1，2*
（1Institute of Plant Protection，Fujian Academy of Agricultural Sciences，Fuzhou，Fujian350013，China；
2Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests，Fuzhou，Fujian350012，China）
Abstract：To select appropriate agents for effective controlling the stem rot disease on Cymbidium ensifolium， toxicities of 6 fungicides， either individually or in combination， were tested in laboratory. All 6 fungicides showed varying degrees of inhibition on Fusarium oxysporum， with EC50 that ranked in the order of prochloraz>difenoconazole>carbendazim or trifloxystrobin>hymexazol or mancozeb. In combination， a synergism between difenoconazole and carbendazim， as well as between trifloxystrobin and carbendazim， was observed. The optimum ratio for the difenoconazole/carbendazim combination was 5/5 with a cotoxicity coefficient of 37863， while that for trifloxystrobin/carbendazim， 8/2 with a coefficient of 24780
Key words： Cymbidium ensifoliu...
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