When spraying the fungicide, you should pay special attention to it, otherwise it will not play the effect of the drug, and it will cause harm to the crop. The Chinese pesticide net Xiaobian introduces the following points to the spraying of the fungicide:
Teach you six strokes to learn to spray the fungicide first. When spraying with liquid, it is often necessary to mix or dilute the agent into an appropriate concentration. If the concentration is too high, it will cause phytotoxicity and waste. If the concentration is too low, it will be invalid. For some moist powders, add a little water, adjust the powder into a paste, then add water, or add some wetting agent during preparation.
Second: spraying time. Premature spraying of fungicides will result in waste or reduce control effects. Too late, a large number of pathogens have invaded the host. Even if the therapeutic agent is sprayed, it will not be effective. It should be based on its situation or according to short-term predictions. Spray protection just after the onset of illness.
Third: the number of sprays. The number of spraying is mainly determined according to the length of the residual period of the drug and the meteorological conditions. It is usually sprayed once every 10-15 days, and sprayed 2-3 times. After the rain, the spray is repeated and the drug is repeated.
Fourth: the amount of spray should be reasonable. If the fungicide is used too little, it will not be able to protect all parts of the plant carefully. If it is too much, it will waste or even cause phytotoxicity. The spray requires fine fog and uniform spray, including the front and back of the blade.
Fifth: Pay attention to the prevention of phytotoxicity. There are many reasons for spraying phytotoxicity on plants. The water-soluble agents are prone to phytotoxicity, and different crops have different sensitivities to the medicinal agents. For example, Bordeaux mixture is not medicated, but copper-sensitive crops can also produce medicines. harm. Beans, potatoes, and cotton are sensitive to stone sulphur. The different developmental stages of the crop react differently to the agent, and the flowering stage of the rice is prone to phytotoxicity. In addition, it is also related to meteorological conditions. Generally, the effects of temperature and sunshine are obvious. High temperature, strong sunshine or heavy fog may cause phytotoxicity. Long-term use of a single agent, especially a systemic bactericide, can lead to resistance to pathogens and render the agent used ineffective. In order to avoid this problem, a compound type of agent or a combination of a systemic fungicide and a conventional fungicide should be selected.
Sixth: pay attention to mixing. Generally, pesticides that are easily decomposed and decomposed by alkaline substances cannot be mixed with alkaline substances. The chemicals that can cause chemical damage after mixing can not be mixed and applied. If mixed, it will not only reduce the efficacy but also cause phytotoxicity. Pesticides that produce emulsion damage or produce a large amount of precipitate after mixing cannot be mixed. Which specific drugs can or cannot be mixed can be found in the instruction manual. A small number of pesticides mix and synergize. For example, dimethoate neutral and acidic fungicides such as mancozeb, wettable sulfur, colloidal sulfur, etc., can be improved not only without reducing the efficacy.
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