中文摘要：

研究了三环唑防治黄瓜炭疽病的作用机制。结果表明：三环唑对黄瓜炭疽病菌菌丝和附着胞黑色素的生物合成有抑制作用,而对菌丝生长、孢子萌发和附着胞形成都没有抑制作用;且黑色素生物合成对三环唑的敏感性在菌株间存在极显著的差异,其中NJ-0菌株菌丝黑色素化的最小抑制浓度（MIC-H）≤1μg/mL,而对NJ-0菌株的MIC-H为50μg/mL。当处理浓度≥MIC-H时三环唑对黄瓜炭疽病菌分生孢子的产生也有影响。但是,三环唑对黄瓜植株的超氧阴离子产生和黄瓜炭疽病菌分生孢子的抗氧化性能没有显著影响。

英文摘要：

The fungicidal activity and disease control mechanism of tricyclazole against Colletotrichum lagenarium were studied. Results showed that tricyclazole had no direct inhibitory effect on growth, spore germination and appressoria formation of C, lagenarium. Direct inhibitory effect on melanin biosynthesis in C. lagenarium by tricyclazole was observed. But there was a marked difference between isolates in sensitivity of melaninization to tricyclazole. The minimum inhibition concentrations （MIC） for hyphal melanization （MIC-H） by tricyclazole were ≤1 g/mL in the isolate NJ-1 and 50 g/mL in the isolate NJ-0. Tricyclazole also had an inhibitory effect on sporulation and this effect was only significant when the treated dose was higher than MIC-H. A satisfactory control efficacy may be achieved when cucumber plants were treated with tricyclazole at concentrations higher than ten fold of MIC-H. Tricyclazole could not significantly induce O2^·- production in cucumber during chemical-plant-pathogen interaction or decrease the antioxidative capacity of spores.