几种玉米种子处理剂防治草地贪夜蛾药效试验

为压低前期虫口基数,筛选对草地贪夜蛾防效较好的种子处理剂,设计并开展此试验.试验结果表明,几种种衣剂对玉米生长安全,在玉米生长前期4个处理对草地贪夜蛾的防效均超过60％.防效最好的为40％溴酰·噻虫嗪FS 450 g/100 kg种子处理,平均保苗率为89.97％,播种后21 d虫口防效为91.21％;其次为50％氯虫...

Field Efficacy of Several Corn Seed-coating Against Spodoptera frugiperda

In order to reduce initial population number,field efficacy trials were devised and carried out to explore the control efficacy of corn seed-coating against Spodoptera frugiperda.Results showed that several seed-coating were safe to maize,and the control effects were higher than 60%in the early stage of maize growth.The seed with 40%cyantraniliprole+thiamethoxam FS at the dosage of 450 g/100 kg showed good seedling protecting effect and the controling effect on S.frugiperda,which were 89.97%,91.21%after seeding for 21 d,respectively.The second was seed with 50%chlorantraniliprole FS at the dosage of 680 g/100 kg,seedling protecting effect and the controling effect were 80.18%,82.1%,respectively.But compared to seed with 50%chlorantraniliprole FS at the dosage of 530 g/100 kg,the emergence rate was decreased.The seed treatment with 50%chlorantraniliprole FS 530 g/100 kg showed high emergence rate,which seedling protecting effect and the controling effect were 70.44%,61.54%after seeding for 21 d,respectively.However,35%difenoconazole+imidacloprid FS at the dosage of 500 g/100 kg showed low emergence rate and seedling protecting effect.They could be used at 40%cyantraniliprole+thiamethoxam FS at the dosage of 450 g/100 kg and 50%chlorantraniliprole FS at the dosage of 530 g/100 kg in production.