马铃薯晚疫病对甲霜灵和精甲霜灵抗药性的田间药效试验

Field Efficacy Test of Potato Late Blight Resistance to Metalaxyl and Metalaxyl-M

为明确甲霜灵和精甲霜灵对马铃薯晚疫病的田间防治效果,选用甲霜灵、精甲霜灵及复配制剂,氟吡菌胺、代森锰锌及其复配制剂作为对照药剂,分别设置常规剂量,通过田间小区药效试验,验证马铃薯晚疫病对甲霜灵和精甲霜灵的抗药性。结果表明:第3次施药后14 d,30%氟吡菌胺·甲霜灵水分散粒剂、10%氟吡菌胺水分散粒剂对马铃薯晚疫病的防治效果均大于70%,防效较好,并且持效期较长;58%甲霜·锰锌可湿性粉剂、68%精甲霜·锰锌水分散粒剂处理对马铃薯晚疫病的防治效果为47.82%~50.15%;80%代森锰锌可湿性粉剂、20%甲霜灵水分散粒剂、24%精甲霜灵水乳剂处理对马铃薯晚疫病的防治效果为25.17%~28.85%,防效较差。综上可知,田间马铃薯晚疫病病原菌对甲霜灵、精甲霜灵已产生了较强的抗药性。

In order to clarify the field control effect of metalaxyl and metalaxyl-M on Phytophthora infestans.metalaxyl,metalaxyl-M and compound preparations were selected,fluopicolide,mancozeb and their compound preparations were used as control agents,routine doses were set separately,through the field community efficacy test,to verify the resistance of potato late blight to metalaxyl and metalaxyl-M.The results showed that 14 days after the third application,the control effects of 30%fluopicolide·metalaxyl water dispersible granules and 10%fluopicolide water dispersible granules on Phytophthora infestans were more than 70%,with good control effect and long duration;The control effects of 58%metalaxyl·mancozeb wettable powder and 68%metalaxyl-M·mancozeb water dispersible granule on Phytophthora infestans were 47.82%-50.15%;The control effects of 80%mancozeb wettable powder,20%metalaxyl water dispersible granule and 24%metalaxyl-M water emulsion on Phytophthora infestans were 25.17%-28.85%,with poor control effect.In conclusion,Phytophthora infestans in the field had developed strong resistance to metalaxyl and metalaxyl-M.