唑菌酯对8种蔬菜病原菌的生物活性

Biological Activity of Pyraoxystrobin against Eight Vegetable Pathogens

通过盆栽试验测定了唑菌酯对8种蔬菜病原菌的生物活性。结果表明,其对黄瓜灰霉病菌Botrytis cinerea、黄瓜霜霉病菌Pseudoperonospora cubensis、黄瓜炭疽病菌Colletotrichum orbiculare、黄瓜褐斑病菌Corynespora cassiicola和黄瓜黑星病菌Cladosporium cucumerinum具有较高活性,EC50值分别为9.457、12.69、11.09、6.453和4.106mg/L。其中,在250mg/L浓度下唑菌酯处理的防病效果与对照药剂嘧菌酯相当,防效大于75%。田间药效试验结果表明,20%唑菌酯悬浮剂有效成分80mg/L对黄瓜霜霉病的防效达82.78%。

The bioactivity of pyraoxystrobin, a recently developed fungicide, against eight fungi causing diseases on vegetables was evaluated through potted plant trails. Result indicated that pyraoxystrobin showed high activity against Botrytis cinerea, Pseudoperonospora cubensis, Colletotrichum orbiculare, Corynespora cassiicola and Cladosporium cucumerinum on cucumber, with EC50 values of 9. 457, 12.69,11.09,6.453 and 4. 106 mg/L,respectively. The control efficacy of pyraoxystrobin at 250 mg/L in field trial reached 75 %, which was equally effective as the control pesticide of azoxystrobin. In field experiments,20% pyraoxystrobin SC at a concentration of 80 mg （a. i）./L provided control efficacy of 82.78% against P. cubensis.