The choice of pesticides should be "four looks"

At first, the wet-spreading performance of the film refers to whether the pesticide solution can be wetted and fully developed after spraying on the crop surface or on the pest body, and apply a small amount of pesticide to the branches and leaves of the crop for experiment. those who can form a drug film and have less liquid loss have good wet-spreading performance, and vice versa. A small amount of neutral detergent can be added to the liquid when using wetting deviated pesticides (such as botanical pesticide aqueous agent) to enhance wet spreading performance. Second, high-quality pesticides generally have good adhesion, but the adhesion properties of insecticidal EC and powder with poor emulsifying performance are poor, so, in order to improve the adhesion effect of the liquid, it is appropriate to use powder insecticides when there is dew on the plant surface in the morning; pesticides with poor emulsifying properties can be prepared with a small amount of neutral detergent to improve the contact effect on pests. Third, the stability of pesticides is very important to the effect of pesticides. Insecticides with poor stability are prone to natural decomposition and deterioration during storage. Therefore, when choosing and purchasing pesticides, farmers must pay attention to the stable effect of pesticides. Insecticides with stable efficacy deviation should not be purchased easily, so as not to affect the insecticidal effect. Fourth, the suspension rate of the agent refers to the properties of wettable powder, suspension agent and other dosage forms. For pesticides with good suspension performance, their small particles can be uniformly decomposed and suspended without sinking in water, which is beneficial to improve the efficacy; after the pesticide with poor suspension is diluted with water, the powder particles will be dispersed and suspended and motionless after a slight vibration. The powder particles will sink to the bottom of the water, which will reduce the efficacy. In the selection and purchase, we must pay attention to the selection and purchase of drugs with good suspension performance. For insecticides with poor suspension performance, a small amount of neutral detergent can be added to improve its suspension.