农药配合使用对庆阳香瓜根结线虫病的防治效果

Control effect of combined pesticide on root-knot nematode of Qingyang cantaloupe

根结线虫病严重发生已成为庆阳香瓜设施生产的主要障碍。2017-2019年,选择根结线虫发生严重的日光温室,在伏季统一进行地面深翻灌水覆膜扣棚15d处理后,比较了12个药剂组合处理对庆阳香瓜根结线虫病的防效。结果表明:在伏季覆盖闷棚处理后,定植期穴施0.5%阿维菌素颗粒剂5000 g/667m^2,生长期以5%阿维菌素乳油3000倍液或5%甲维盐水分散粒剂1500倍液500 mL/株灌根2次,防病效果分别为66.1%、76.8%。经多点示范,以上2个药剂配合使用处理对庆阳香瓜根结线虫病的平均防效达71.2%。

Qingyang cantaloupe is a national registered protective agricultural product with geographical indication,that is of great importance to targeted poverty alleviation in Qingyang of Gansu.However,the root-knot nematode has become the main obstacle to cantaloupe greenhouse production of Qingyang.The greenhouse with severe root-knot nematode occurrence was selected from 2017 to 2019.The control effect of 12 pesticide combinations on root-knot nematode of Qingyang cantaloupe was tested in the hottest month of the year after the ground was deeply plowed,irrigated,and covered with shed film for 15 days.The results showed that with the application of 0.5%abamectin GR 5000 g/667 m^2 while transplanting,the control effect of 5%abamectin EC 1∶3000 dilution and 5%emamectin benzoate WG 1∶1500 dilution(applied twice during the growing season to the root at 500 ml per plant)on root-knot nematode was 66.1%and 76.8%.Through multi-site demonstration,the average control effect of the above two pesticide combinations on root-knot nematode of Qingyang cantaloupe was 71.2%.Considering the factors of pesticide resistance in the field,5%abamectin EC and 5%emamectin benzoate WG should be used alternately.