Pesticides | Poor insecticidal efficacy? Did you really use the right insecticide?

Release time:

2021-09-26

A crop insecticide, when initially used, often has good insecticidal effects, but as the dosage and scope of use continue to increase, cases of increased resistance continue to emerge. Improving the insecticidal effect of pesticides is beneficial for promoting high agricultural production, reducing production costs, and improving economic benefits. So, how can we improve the effectiveness of pesticides and insecticides?

1. Timely medication

The entire growth period of pests is generally divided into four stages: adult, egg, pupa, and larva. Eggs, pupa, and mature larvae have strong resistance to pesticides. Therefore, it is important to apply medication before the third instar of the larvae and during the nymph stage, when the resistance is weak, in order to improve the efficacy.

2. Moderate medication

1. Do not use too much or too little medicine.

2. The concentration of the medicine solution should not be too high or too low. Excessive levels can cause poisoning of humans and animals, causing pesticide damage to crops. Low insecticidal effect is poor. Strictly follow the instructions on the pesticide label, and do not add water to prepare pesticides at will or carelessly.

3. Targeted medication against thrusting mouthpiece pests

For example, aphids and leaf cicadas, it is better to use endothermic pesticides. For chewing mouthpiece pesticides, it is better to choose gastric toxic pesticides. Some pesticides, although they have various functions such as gastric toxicity, inhalation, and fumigation, can prevent and control various pests, but their efficacy varies in speed and level for different pests. Therefore, it should still be clarified and selected reasonably.

4. The application of pesticides in rice fields should maintain a shallow water layer

One is that there is water in the field, and pesticides fall into the water, forming a layer of "pesticide film". Some pests, such as rice planthoppers, jump into the field when startled, float on the water surface, encounter the pesticide film, and become poisoned again.

The second is that borers burrow into the rice stem near the water surface, causing damage. There is water in the field, and the tension of the water is used to allow the medicinal liquid to enter the boreholes of the borers, improving the effectiveness of killing borers.

Thirdly, after some pests are poisoned, they faint and fall into the water, which not only causes secondary poisoning but also can cause drowning to prevent rebirth. Fourth, there is shallow water in the field, and the water temperature is higher than the temperature in sunny days, which can increase the volatilization of volatile pesticides such as Dichlorvos, which is conducive to improving the "fumigation" insecticidal effect.

5. Spraying pesticides should be done in dew, after the rain dries, and the droplets should be fine

Do not spray during hot noon. Therefore, when pests are mostly hidden and inactive, the medicinal liquid will quickly dry up, the insecticidal effect is poor, and it is easy to cause poisoning and drug damage to humans and animals. For pests hidden in the lower part of the plant stem, such as rice planthoppers, it is better to sprinkle them with pesticides and water. To allow the liquid medicine to flow down the stem and onto the lower part of the pest, enhancing its insecticidal effect.

In addition, it is important to rotate the medication to prevent pests from developing resistance. Reasonably mix pesticides and simultaneously control multiple pests. Do not use hard water to prepare pesticides. Before using medicine, it is important to clean the sprayer thoroughly to improve the insecticidal effect of pesticides.

Attention should be paid to medication time: do not use medication during high temperatures or rainy days. High temperature increases evaporation and reduces efficacy. When it rains, the concentration of the drug is reduced, reducing its efficacy. (Source: Jinnong.com)

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