A crop insecticide, when first used, the insecticidal effect is often very good, but with the continuous increase of the dosage and the expansion of the scope of use, the cases of increasing drug resistance continue to appear. Improving the insecticidal effect of pesticides is conducive to promoting high agricultural yield, reducing production costs and improving economic benefits. So, what can be done to improve the effectiveness of pesticides and insecticides?

1. Timely medication

The whole growth period of pests is generally divided into four stages: adult, egg, pupa, and larva. Egg, pupa and mature larvae have strong drug resistance. Therefore, it is necessary to pay close attention to the application of the drug before the third instar of the larvae and the nymph stage, when the drug resistance is weak, which is beneficial to improve the efficacy of the drug.

2. Moderate medication

1. The dosage should not be too much or too little.

2. The concentration of the liquid medicine should not be too high or too low. Too high will cause human and animal poisoning and cause phytotoxicity to crops. Too low insecticidal effect is poor. Follow the directions on the pesticide label exactly, and do not mix pesticides with water "as you want" or carelessly.

3. Symptomatic medication for piercing-sucking pests

(such as aphids, leafhoppers) it is better to use systemic pesticides. For chewing mouthparts pesticides, it is better to use stomach-toxic pesticides. Although some pesticides have various functions such as stomach poisoning, systemic absorption and fumigation, and can control many kinds of pests, they still have different effects on different pests. Therefore, it should be clarified and selected reasonably.

4. The application of pesticides in paddy fields should be kept in shallow water.

First, there is water in the fields, and the pesticides fall into the water to form a layer of "medicine film". Some pests, such as rice planthoppers, jump off the field when they are startled, float on the water surface, and when they encounter the film, they are poisoned again.

Second, the borer bores into the stem near the water surface at the base of the rice stem to cause damage. There is water in the field, and the tension of the water is used to let the liquid medicine enter the borer of the borer to improve the killing effect of the borer.

Third, after some insects are poisoned, they faint and fall into the water, which will not only cause secondary poisoning, but also drown to prevent resurrection. Fourth, there is shallow water in the field, and the water temperature is higher than the air temperature on sunny days, which can increase the volatilization of volatile pesticides such as dichlorvos, and is beneficial to improve the insecticidal effect of "fumigation".

5. The spraying of pesticides should be done in dew, and after the rainwater dries, the mist droplets should be fine

Do not spray in the middle of high temperature. Therefore, when the pests are mostly hidden and inactive, the liquid medicine will dry up quickly, the insecticidal effect is poor, and it is easy to cause human and animal poisoning and phytotoxicity. For the pests hidden in the lower part of the plant stem, such as rice planthoppers, it is better to sprinkle with pesticides and water. In order to let the potion flow down the stem to the lower part and the pests to enhance the insecticidal effect.

In addition, it is necessary to pay attention to the rotation of the medicine to prevent the pests from developing resistance. Reasonably mix pesticides, and control a variety of pests. Do not formulate pesticides with hard water. It is very important to improve the insecticidal effect of pesticides, such as cleaning the sprayer before use.

Attention should be paid to the medication time: do not take medication in high temperature or rainy times. High temperature increases evaporation and reduces efficacy. When it rains, the concentration of the drug will be flushed and the efficacy of the drug will be reduced. (Source: Jinnong.com)