1. When spraying with liquid agent for concentration, it is often necessary to use water to mix or dilute the drug to a suitable concentration. If the concentration is too high, it will cause injury and waste. If the concentration is too low, it is ineffective. Some non-wettable or difficult-to-wet powders should be added first, powdered into a paste, and then added with water, or some wetting agents can be added during formulation. 2, spray time spraying time prematurely will cause waste or reduce the effectiveness of control, too late a large number of pathogens have invaded the host, even if the spray systemic therapeutic agents, but also little harvest, should be based on the law of the incidence and the situation or according to Short-term predictions promptly spray protection in the absence of disease or just after onset. 3. The number of spraying times The spraying frequency 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 2-3 times in total. After the rain, the spray should be considered and the cost should be saved. 4, spray the quality of the amount of spray should be appropriate, too little can not be all parts of the plant are closely protected, too much waste or even cause harm to the drug, spraying requirements of the fine mist, spray evenly, the plant should protect the various ministries Include both the front and back of the blade. 5. Phytotoxicity problems There are many reasons for spraying pesticides on plants. The agents with strong water-soluble are prone to phytotoxicity, and the susceptibility of different crops to pesticides is also different. For example, Bordeaux fluid will not cause phytotoxicity, but Copper-sensitive crops can also produce phytotoxicity. Beans, potatoes, and cotton are sensitive to lime sulfur. The different developmental classes of crops respond differently to pesticides, and seedlings and booting stages are susceptible to phytotoxicity. In addition, it is also related to meteorological conditions. Generally, the effects of temperature and sunshine are more obvious. High temperature, strong sunlight, heavy fog, and high humidity all easily cause phytotoxicity. 6. How to mix common pesticides that are 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. 7. Drug resistance problems The long-term use of a single agent (mainly a systemic fungicide) can result in resistance to the pathogen and render the agent ineffective. To avoid this problem, different types of medicaments can be used interchangeably, or a combination of systemic bactericides and traditional bactericides.
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