Two key points of insecticide spraying

First, according to the climate characteristics and the law of diurnal activity of pests, the pesticide should be applied in a favorable period of time. The suitable time of application is from 9 am to 10:00 and after 4 pm. Because at 9: 10 in the morning, the dew on the crop leaves is dry, and it is the time when sunrise pests are most active. At this time, the application of pesticide will not affect the control effect because of the dew dilution, but also make the pests come into direct contact with pesticides and increase the chance of pest poisoning. After 4 p.m., the light weakens, which is the time for insect pests to fly and nocturnal pests are about to go out. When the pesticide is applied at this time, the pesticide can be applied to the crops in advance, and when the pests come out or feed at dusk or at night, they will be exposed to venom or poisoned to death, and the evaporation loss and photolysis failure can be avoided at the same time. Second, according to the harmful parts of the pests, different agents should be selected and different application methods should be adopted to deliver the drugs in place. If the pest harms the root, the liquid should be applied to the root or in the sowing ditch; for the pest that feeds on the back of the leaf, the liquid should be sprayed on the opposite side of the leaf; to control red bollworm and cotton bollworm, the liquid should be sprayed on the flower bud, green boll and group tip; to control the dead heart seedlings caused by borer, the pesticide should be made into poisonous soil to spread; to control white ear, the liquid should be sprayed or sprinkled. To control rice planthopper and rice leaf tick, the solution should be sprayed to the base of rice plant, and to control Spodoptera litura, the solution should be sprayed on flower buds and young pods. In addition, according to the feeding mode of piercing mouthparts for hidden pests such as cotton aphid, red spider, rice planthopper and rice leaf tick, insecticides with strong internal absorption can be selected, and the solution can be transmitted to other parts of the plant to achieve the purpose of drug delivery.