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2, spraying time too early will cause waste or reduce the effectiveness of the control, too late, a large number of pathogens have invaded the host, even if the spray of therapeutic agents, the harvest is not large, should be based on the incidence of the law and the situation or according to the situation Short-term predictions will be sprayed in a timely manner when there is no onset or just onset.
3, spraying times The number of spraying is mainly determined according to the length of the residual period of the drug and the meteorological conditions, usually sprayed once every 10-15 days, a total of 2-3 times, after the rain to make up the spray, should consider the cost, save medication.
4, spray quality spray should be appropriate, too little can not be carefully protected on all parts of the plant, too much waste or even cause phytotoxicity, spraying requires fine fog, evenly sprayed, the plant should be protected The front and back sides of the blade are sprayed.
5, phytotoxicity problems Spraying drugs on plants for a variety of reasons, water-soluble agents are prone to phytotoxicity, different crops have different sensitivities to the pharmacy, such as Bordeaux liquid generally does not cause phytotoxicity, but Copper-sensitive crops can also cause phytotoxicity. Beans, potatoes, and cotton are sensitive to stone sulphur. Different developmental classes of crops react differently to the drug, and the seedlings and the flowering stage of the boot are 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, heavy fog, and high humidity are likely to cause phytotoxicity.
6. How to mix pesticides that are generally prone to decomposition and failure of alkaline substances, and cannot be mixed with alkaline substances. For example, alkaline bactericides such as Bordeaux mixture, stone sulphur mixture, etc. cannot be mixed with 1605, dimethoate, dichlorvos and the like. Agents that produce a chemical reaction that causes phytotoxicity after mixing cannot also be administered in combination. A small number of pesticides are mixed to increase synergy. For example, dimethoate neutral and acidic bactericidal properties such as zinc, wet sulphur, colloidal sulfur, etc., the effect is not affected, but slightly improved.
7. Drug resistance problems The long-term use of a single agent (mainly a systemic fungicide) can lead to drug resistance and invalidation of the agent used. To avoid this problem, different types of agents can be used alternately, or a combination of a systemic fungicide and a conventional fungicide.
Seven use of fungicides
1. When using a liquid spray, it is often necessary to formulate or dilute the drug into an appropriate concentration with water. If the concentration is too high, it will cause phytotoxicity and waste. If the concentration is too low, it will be ineffective. Some non-wettable or difficult-to-wet powders should be added a little, the powder should be mixed into a paste, then added with water, or some moisturizer can be added during preparation.
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