水稻稻瘟病菌不同发育阶段对7种QoI类杀菌剂的敏感性

Sensitivity of Magnapothe grisea at Different Development Stages to Seven QoI Fungicides

以嘧菌酯为对照药剂，研究了6种中国自主创制的QoI类杀菌剂对水稻稻瘟病菌Magnapothegrisea不同发育阶段的影响。结果表明，供试药剂对水稻稻瘟病菌菌丝扩展均表现出良好的抑制作用，EG50值为0．10～2．89μg／mL；对病菌产孢量和孢子萌发的抑制作用明显，EC50值分别为0．10～4．92和0．75～7．14μg／mL。在1．0μg／mL的含药平板上，烯肟菌酯、嘧菌酯、丁香菌酯、SYP-2815对水稻稻瘟病菌产孢量的抑制率均大于90％；对病菌孢子芽管伸长也具有一定的抑制作用，层G0值为1．67～34．76μg／mL。在1．0μg／mL的含药平板上，7种QoI类药剂对水稻稻瘟病菌菌丝形态无明显影响，但可明显抑制其黑色素的产生。

The sensitivity of Magnapothe grisea in vitro at different development stages to six innovative QoI fungicides by China was studied adopting azoxystrobin as the control fungicide. Results showed that these 7 QoI fungicides had strong activity on mycelia growth of M. grisea with EC50 values ranging from 0.10 to 2.89μg/mL, spore yield and spore germination with ECso values ranging from 0.10 to 4.92 μg/mL and 0.75 to 7. 14 μg/mL, respectively. The inhibition rate of spore yield on 1.0μg/mL enestroburin-,azoxystroburin-,SYP-3375- and SYP-2815- amended media was higher than 90%. Seven QoI fungicides could inhibit the length of germ tube of M. grisea with EC50 values ranging from 1.67 to 34.76 μg/mL. It could not affect the formation of mycelia, but strongly inhibit melanin biosynthesis of M. grisea on 1.0μg/mL fungicide-amended media.