草原沙葱萤叶甲发生趋势及植物源农药田间防治效果

Occurrence trend of Galeruca daurica Joannis in grassland and control efficiency of botanical pesticides

为分析沙葱萤叶甲发生趋势,筛选出具有较好防治效果的药剂,对沙葱萤叶甲在内蒙古草原的为害进行了监测,并以幼虫为试虫,采用大型喷雾机械对3种常用植物源农药进行了防效试验。结果表明,0.3%印楝素乳油、1.3%苦参碱水剂及1.2%烟碱·苦参碱乳油在制剂用量30mL/667m2条件下,药后3、5d及10d对沙葱萤叶甲的防治效果为85.5%~100.0%,与4.5%高效氯氰菊酯水乳剂相比差异不显著（P〉0.05）。沙葱萤叶甲在内蒙古的为害呈加重趋势,在甘肃、宁夏、新疆等地发生可能性大,应加强实时监测。印楝素、苦参碱和烟碱·苦参碱对沙葱萤叶甲防治效果好,在草原沙葱萤叶甲绿色防控上具有很高的推广价值。

In order to investigate the occurrence trend and select effective insecticides, a field trial was conducted to investigate the control effects of three botanical pesticides on the larvae of Galeruca daurica Joannis by using large nebulizer in grassland. The results showed that the corrected control effects of 0.3% azadirachtin EC, 1.3% matrine AS and 1.2% nicotine · matrine EC were 85.5%- 100.0% after 3 d, 5 d and 10 d at the dosages of 30 mL/667 m2, without significant difference （P〉0.05）from 4.5% beta-cypermethrin EW. The damage of G. daurica in Inner Mongolia is increasing, and it is likely to occur in Gansu Province, Ningxia Hui Autonomous Region and Xinjiang Uygur Autonomous Region, therefore, monitoring of the pest should be strengthened in the four provinces. Due to the good control effects, the three botanical insecticides have the potential to be applied for G. daurica control in grassland.