Impact of meteorological conditions on the use of pharmaceuticals

Light, temperature and humidity will affect the efficacy of pesticides on plants and the extent of the injury, it will also affect the pollution of the surrounding environment. Only by rational application of drugs can we achieve the effect of saving labor and achieving a win-win situation.
First, the temperature and the high application of pesticides tend to promote the decomposition of the drug and the volatilization of the active ingredient of the drug. When the weather is hot, the chemical activity of the agent becomes stronger, and the toxicity of the pesticide becomes larger. The crops are vigorous in hot weather, and the stomata on the leaves are open and large, and the medicinal spray is easy to invade into the crop body, causing damage. The above phenomenon occurs when the stone sulphur mixture, emulsifiable concentrate and various herbicides are used under high temperature conditions. Therefore, under hot and hot weather conditions, do not apply the medicine as much as possible, especially at noon. If the application is applied, the concentration should be smaller to prevent the occurrence of phytotoxicity and poisoning accidents. The optimum time for pesticide application should be selected on sunny days 8-10 am and after 4 pm. Because the temperature is not high at this time, the wind is small, the air above the plant has an inversion layer, so that the medicine can not fly, but can be weakly on the plant. Thereby improving the efficacy and reducing the phytotoxicity.
In addition, in the hot season, the laws of pest and disease activities have certain characteristics. For example, many of the pests (rice planthopper, rice leafhopper, etc.) have the habit of yin and yang, and tend to concentrate on the lower part of the plant or the back of the plant, while the disease mostly invades from the stomata and the lower leaves. At the same time, in the hot season, the propagation of pests and diseases will spread faster, and the resistance of pests and diseases will also increase. The pesticide network reminds everyone that when applying in high temperature season, according to the hazard characteristics of pests and diseases, it is necessary to determine the spraying position reasonably, master the optimal spraying timing, pay attention to checking the efficacy, properly change the pesticide, reduce the resistance of pests and diseases, and improve Control effect.
Second, humidity and high application humidity The impact of pesticides on pesticides is mainly to accelerate the chemical decomposition of certain agents, causing the agents to fail or cause phytotoxicity. Such as the high humidity of the leaf surface, easy to adhere to the powder pesticide, so that the pesticide application is uneven and cause phytotoxicity. At the same time, the dew on the leaf surface can also dilute the drug and reduce the drug effect. Therefore, when it is foggy, dew or just raining, it is not advisable to use Bordeaux mixture or sodium fluorosilicate which is greatly affected by humidity. If necessary, take appropriate measures, such as reducing the amount of copper sulfate or increasing the amount of lime when spraying Bordeaux mixture. Generally, you should choose a sunny, windless or breeze-free application in the absence of dew.
Third, wind, rain and pesticide application When spraying pesticides, powders and smoke agents are greatly affected by wind and wind direction. In high winds, it is not advisable to apply pesticides to control pests and diseases. This is because: first, wind blows away the chemicals, especially powders, and at the same time, accelerates the evaporation of the chemicals. Second, because the branches and leaves of crops are affected by the wind. Mutual vibration and friction will cause mechanical loss of the pharmacy; thirdly, the fog or powder of the sprayed wine is easy to fly with the wind, and cannot fall evenly and adhere to the surface of the crop to be controlled; Fourth, the wind pharmacy is easy to fall to The body of the pesticide application increases the chance of poisoning. If you need urgent control, you can use emulsifiable concentrates and wettable powders. Because it is less affected by the wind.
If the application is short, the rain will cause the applied agent to be washed away and not only reduce the efficacy, but also pollute the river waters. The general agent does not have strong resistance to rain, especially powders and non-endrols. Tips for China Pesticide Network : When it is raining, pesticides cannot be applied. If it is raining after application, wait until the rain stops and apply it in time.

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