First, pay attention to the application time Premature application time will result in waste of the drug or reduce the efficacy of the drug; too late will cause a large number of pathogens to invade the host, even if sprayed for treatment, it has little effect. Second, pay attention to the use of concentration When spraying with a liquid, it is often necessary to formulate or dilute the agent to a suitable concentration with water. Too high a concentration will cause phytotoxicity and waste, and if the concentration is too low, there will be no medicinal effect. For some non-wettable or difficult to wet powders, add a little water, adjust the liquid to a paste, and then add water to use. Third, pay attention to the number of application The bactericide is usually sprayed once every 10 to 15 days, and sprayed a total of 2 to 3 times. After spraying, it should be sprayed. When applying a fungicide, care should be taken to consider the cost and save the medication. Fourth, pay attention to reasonable mix Generally, pesticides that are easily decomposed and decomposed by alkaline substances cannot be mixed with alkaline pesticides. For example, the alkaline bactericide Bordeaux mixture, stone sulphur mixture, etc. cannot be mixed with 1605, dimethoate, dichlorvos, etc., otherwise a chemical reaction will occur. Agents that cause phytotoxicity cannot be mixed. A small number of pesticides can be synergistic after mixing. For example, dimethoate (neutral) mixed with an alkaline bactericide (such as zinc, sulphur, colloidal, etc.), the effect will not be affected, but will be slightly improved. Five, pay attention to drug resistance The long-term single-use agent (mainly the systemic fungicide) will make the pathogenic bacteria resistant, making the conventional drug dosage invalid, and increasing the difficulty of prevention. In order to avoid the occurrence of drug resistance, different types of agents, such as systemic agents and traditional fungicides, are used alternately. Six, pay attention to the quality of application The amount of spray should be appropriate, the amount of application should be too small, and the parts of the plant should not be carefully protected; too much is easy, causing phytotoxicity and waste. Apply a fine mist to the application, spray evenly, and spray on the front and back of the plant. Seven, pay attention to the problem of phytotoxicity There are many reasons for the phytotoxicity caused by the application of the drug, and the highly water-soluble agent is prone to phytotoxicity. The sensitivity of different crops to pesticides is also different. For example, Bordeaux mixture generally does not cause phytotoxicity. Beans, potatoes, cotton, etc. are sensitive to sulphur sulphur, which may cause phytotoxicity. The response of the crops to the different developmental stages of the crops is also different. In general, the seedling stage and the flowering stage of the boot are prone to phytotoxicity and should be used with caution. In addition, phytotoxicity is also related to weather and meteorological conditions. Paint Roller,Roller Paint Brush,Long Roller Paint Brush,Foam Roller Paint Brush Laizhou Chenke trading Co., Ltd. , https://www.chenkegroup.com