How to improve the effect of insecticides?

Now the planting cost is getting higher and higher, pesticides account for a large part, but the effect is often not ideal, how to improve the effect of pesticides? The use of chemical pesticides to control crop pests, there are three factors directly affect the control effect: first, climate. After application, the pesticide will be washed and leached by Rain Water in case of rain or rain; on a sunny morning, the concentration of the solution will be released and diluted because of dew on crop leaves; at noon in sunny days (especially in summer), high temperature and strong light will cause evaporation loss and decomposition failure by strong light. In addition, hot and dry air will also accelerate the volatilization of the liquid. Second, the activity law of pests. The activity of insect pests is obviously controlled by the alternation of day and night, and the behavior is sunrise and nightrise. Sunrise pests such as Pieris rapae, bridge worms, and rice locusts like to be active during the day when there is plenty of light; Chilo suppressalis hatches most in the morning; and rice leaf rollers hatch all day long as long as there is daylight. However, most pests like to be active at night and have phototaxis. For example, rice bracts often hide in the bracts during the day and come out in the evening to feed; rice weevil and beetles do not see shadows during the day and harm them at night; ground tigers hide in soil crevices or plant roots during the day and bite crops at night; and Spod moth and bean pod borer all appear to be dormant during the day and night. Third, the harmful parts of pests. Pests harm crops in certain parts, such as aphids, which often live on the back of leaves, armyworm, bridge worm, rice leaf borer, cabbage worm, rice locust and other crops; rice planthopper and rice leafhopper often live at the base of rice plants to feed and lay eggs; pod borer likes to harm pods and eat beans; Spod moth bites plant fruits and so on. To sum up, while selecting the right pesticides and applying them at the right time, we must also apply the pesticides in time according to different conditions and deliver them in place. The main results are as follows: 1. According to the characteristics of climate and the law of diurnal activity of pests, the pesticide should be applied at a favorable time. The suitable time for spraying pesticide is 9: 00 in the morning and 4: 00 in the afternoon. Because after 9: 00 in the morning, the dew on the crop leaves has dried, and it is the most active time for sunrise pests, which can make the pests come into direct contact with pesticides and increase the chance of poisoning. After 4 o'clock in the afternoon, the sun tends to the west, the light weakens and the temperature drops, which is when flying activities and nocturnal pests are about to go out at dusk. When taking medicine at this time, the medicine can be applied to the crops in advance, and when the pests come out to move or feed, they will be poisoned and killed after being exposed to venom or feeding. At the same time, evaporation loss and photolysis failure can be avoided. 2. According to the harmful parts of insect pests, different pesticides and different application methods are selected to deliver the medicine in place. For example, the insecticide is applied to the root of the plant or the sowing ditch; the liquid is sprayed on the opposite side of the leaf when feeding on the back of the leaf; the poisonous soil is sprayed on the seedlings caused by the control of borer, and the white ear is sprayed or poured; the liquid is sprayed on the base of the rice plant for the control of rice planthopper and rice leafhopper; the liquid is sprayed on the fruit for the control of Spodoptera litura; and the solution is sprayed on the flower buds and young pods for the control of pod borer. In addition, for hidden pests such as rice planthopper and rice leafhopper, according to the feeding mode of their sucking mouthparts, insecticides with strong internal absorption can be selected to coat stems or spray leaves, which can be absorbed by stems and leaves and transmitted to other parts of the plant to achieve the purpose of drug delivery. More insecticide application techniques