The time of spraying the medicine at the time of spraying will cause waste or reduce the effectiveness of control. If it is too late, a large number of pathogens have invaded the host. Even if the therapeutic agent is sprayed, it will not be harvested. It should be based on the law of occurrence and the situation at that time or according to short-term prediction. Promptly spray protection when there is no disease or just after onset.

The number of spraying times is mainly determined according to the length of the pesticide residual period and the meteorological conditions. Generally, it is sprayed once every 10 to 15 days and sprayed for 2 to 3 times. After the rain, the spray should be considered and the cost should be saved.

The amount of sprayed spray should be suitable. If too little is used, all parts of the plant must not be completely protected. If too much of it is wasted or even caused by phytotoxicity, the spray should be fine and sprayed uniformly. The various parts to be protected should include leaves. Both the front and the back side must be sprayed.

How to mix pesticides which are generally susceptible to decomposition and failure due to alkaline substances, cannot be mixed with alkaline substances. For example, alkaline bactericides such as Bordeaux mixture, lime sulfur, etc. cannot be mixed with 1605, dimethoate, and dichlorvos. Medicinal chemicals that can cause phytotoxicity after mixing can not be mixed and applied. A few pesticides work together to increase synergism. For example, dimethoate neutral and acid bactericidal properties such as zeocin, wet sulfur, colloidal sulphur, etc., are not only unaffected, but slightly improved.

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