As soon as the corn germinated, the medicine was blocked. What effect does it have on corn?

As soon as the corn germinated, it rained after using the blocking medicine, which had no effect on the corn, but the efficacy was not good.

Precautions for spraying pesticides are as follows.

1. In windy weather, general powdery pesticides and spray pesticides will be affected, and pesticides will be easily blown away by strong winds, reducing the role of pesticides and failing to achieve results. Moreover, the diffusion of pesticides with the wind is easy to cause environmental pollution. When spraying powder at will in strong wind, the wind speed shall not exceed1m/s; When spraying at low volume, the wind speed should not exceed 5m/s; Ultra-low volume spray, the wind speed shall not exceed1-3m/s.

2. Using pesticides in rainy days is easy to be washed away or diluted by rain, which can not achieve the expected effect, and pesticides may also cause environmental pollution when they flow into the soil.

3. When spraying pesticides at high temperature and heat, the pesticides are easy to volatilize and decompose, which affects the efficacy and may even cause poisoning of pesticide users. Generally speaking, the spraying temperature is 20-30℃.

4. Dilute pesticides with well water: Well water contains a lot of calcium and magnesium substances. Diluting pesticides with well water will destroy the emulsification and suspension properties of pesticides, reduce their efficacy or even lose their efficacy completely, which not only affects the control effect, but also is prone to phytotoxicity.

5. Wettable powder for pesticide spraying: Wettable powder is a powder made by adding a certain amount of wetting agent and filler to the original drug and grinding it by mechanical rolling or airflow crushing. Compared with general powder, wettable powder has high content of effective components and poor fluidity. Therefore, it can only be used as a suspending agent after being dissolved in water, and it is not allowed to be sprayed directly as a powder.

6. Use granular pesticides to impregnate the spray: the specifications and components of granular pesticides are mostly developed and produced according to the biological characteristics of their control objects and protected objects and the environmental conditions of the application site, so they have strong specificity, special effect and application target; At present, it is mainly used for ground and underground pesticide application to control weeds or pests, and it is not allowed to spray in water. In addition, most of the raw drugs used to produce granules are highly toxic pesticides, which reduce the toxicity after granulation and increase the safety when used; Soaking spray will restore its toxicity, and it is easy to cause pesticide users to be poisoned when used.

7. Use highly toxic pesticides as ultra-low dose spray: Because the concentration of ultra-low dose spray is higher than that of conventional spray, it can only be used to spray pesticides with low toxicity, such as malathion, cartap, dimethoate and pyrethroid pesticides. The applicator must always walk in the windward row, without adding chemicals, and it is forbidden to use 1605, 1059, methamidophos and Su Hua.

Try to spray pesticides in the above environment. If you spray pesticides in rainy season, you can also refer to the spraying skills in rainy season.