The use of pesticides to control crop pests, in order to achieve the best insecticidal effect, in addition to the selection of quasi-pharmaceutical agents, appropriate drug use, but also should pay particular attention to the following two easily overlooked issues.
According to the characteristics of climate and the law of day and night activities of pests, choose to apply drugs at favorable times. The pesticide application time is suitable from 9:00 am to 10:00 pm and after 4 pm.
Because after 9 o'clock in the morning, the dew on the leaves of the crops has dried up. It is also the time when the sunrise pests are most active. At this time, the application of pesticides will not affect the prevention and control effect due to dew liquid, but also allow direct contact between pests and pesticides, increasing the chance of pest poisoning. After 4 pm, the light weakens, and it is during the flight and nocturnal pests that they are about to move. At this time, the pesticide is applied and the pesticide can be applied to the crop in advance. When the pests move out or feed at dusk and at night Causes death from exposure to venom or food poisoning, and also avoids evaporation loss and photolysis failure of the liquid.
According to the harmful parts of pests, choose different medicines and adopt different methods of spraying.
For pests that harm the roots, the pesticide is applied to the roots or applied to the sowing ditch; the pests feeding on the back of the leaves spray the liquid on the opposite side of the leaves; the control of the pink bollworm and the cotton bollworm is treated with medicine. To the buds, bells, and on the tip of the group; prevention and control of aphids caused by dead heart seedlings to spread poisonous soil; prevention and control of white spikes on the spray or splashing; prevention of rice planthoppers, rice leafhoppers will spray liquid to the base of rice plants; Spodoptera litura sprayed liquid buds and larvae. In addition, hidden insects such as cotton aphid, red spider, rice planthopper, and rice leafhopper, etc., can be absorbed by insecticides with strong systemic absorption and transmitted to other parts of the plant according to their sucking and sucking mouthparts. To achieve the purpose of drug delivery.
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