How to choose the time and location for the use of pesticides

In order to achieve the best insecticidal effect in the use of pesticides to control crop pests, special attention should be paid to the time and position of drug use in addition to the selection of appropriate insecticides and appropriate period of use. First, the pesticide should be applied at a favorable time according to the characteristics of climate and the law of diurnal activity of pests. The suitable time for pesticide application is from 9 am to 10:00 and after 4 pm. Because after 9: 00 in the morning, the dew on the crop leaves has dried, and it is the time when the activity of sunrise pests is at its peak. 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 o'clock in the afternoon, the sun tends to the west, the light weakens, the temperature decreases, and it is when flying activities and nocturnal pests are about to go out at dusk, the pesticide can be applied to crops in advance. When the pests come out or feed at dusk or at night, they will be exposed to venom or poisoned, and the loss of evaporation and photolysis can be avoided. Second, according to the harmful parts of pests, different pesticides and different application methods should be selected to deliver the medicine in place. For the pests that harm the roots, the insecticides are applied to the roots or in the sowing ditches; for the pests that feed on the back of the leaves, the liquid is sprayed on the opposite side of the leaves; the control of red bollworm and cotton bollworm is applied to the flower buds, green bolls and the tip of the group; the seedlings are poisoned when the stem borer is withered; the white panicle is sprayed or poured; the liquid is sprayed to the base of rice plants to control rice planthoppers and rice leafhoppers. To control Spodoptera litura, spray the liquid on the 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 leafhopper, strong internal absorption insecticides can be selected to transmit to other parts of the plant to achieve the purpose of drug delivery. Only when the insecticides are applied and delivered in place, can we hit the key points, achieve the efficacy of killing insects, make the agents play the best role, and obtain the ideal insecticidal effect.