Evaluation of the Control Effect of Different Drugs on the Mixed Population of Grassland Grasshopper in The Northern Foot of Qilian Mountains
In order to screen the suitable control drugs and spraying concentration of grassland grasshopper,the control effect of 3 different agents with different spraying concentration on grassland grasshopper was compared in this experiment.The results showed that:The mixed population density of grassland grasshopper in the test area was about 15 heads/m2,and the three agents had good control effect on grassland grasshopper.Among them,4.5%cypermethrin had the fastest effect,and the control effect reached more than 90%after 3d application.The control effect of 1.8%abamectin at 300 mL/hm2 and 1.3%matrine at 750 mL/hm2 was not significantly different from that of 4.5%cypermethrin at 600ml/hm2(P>0.05).In order to ensure the control effect and ecological safety,it is recommended to use matrine and avermectin in general control,the recommended dosage is 750 mL/hm2 and 300 mL/hm2,and the recommended dosage is 600ml/hm2 when the harm is serious.