What should I pay attention to when playing fungicides?

What should I pay attention to when playing fungicides? Please introduce the fungicides to pay attention to the following points: when spraying liquid agents with concentration, it is often necessary to use water to mix or dilute the agents to an appropriate concentration, too high concentration will cause drug damage and waste, and too low concentration will be ineffective. For some moist powders, you should first add a little water, adjust the powder into a paste, and then add water to prepare it, or you can add some wetting agents during preparation. Spraying time too early will cause waste or reduce the control effect. if it is too late, a large number of pathogens have invaded the host, and even if the therapeutic agent is sprayed, it will not be effective. Spray protection should be done in time according to the situation or according to short-term predictions. The times of spraying are mainly determined according to the length of the residual period of the medicine and meteorological conditions. Generally, it is sprayed once every 15 days, a total of 3 times, supplementary spraying after rain, repeated use of medicine. Spray quality spray quantity should be appropriate, too little can not carefully protect all parts of the plant, too much will waste or even cause drug damage, spray requires fine fog, uniform spray, including the front and back of the leaves should be sprayed. There are many reasons for the drug damage caused by spraying to plants, the stronger water-soluble agents are easy to cause drug damage, and different crops have different sensitivity to drugs, for example, Bordeaux solution has no drug damage, but crops sensitive to copper can also produce drug damage. Beans, potatoes and cotton are sensitive to stone sulfur mixture. The response of crops to pesticides is different in different development stages, and the drug damage is easy to occur in rice booting and flowering stage. In addition, it is also related to meteorological conditions, generally, the effects of air temperature and sunshine are more obvious, high temperature, strong sunshine or heavy fog are easy to cause drug damage. How to mix pesticides that are easy to decompose and fail in the event of alkaline substances, can not be mixed with alkaline substances, for example, alkaline fungicides such as Bordeaux solution, stone-sulfur mixture, etc., can not be mixed with 1605. Chemicals that cause chemical reactions after mixing can not be mixed, for example, the mixture of stone sulfur and 1605 will not only reduce the efficacy, but also cause damage. Pesticides that cause emulsion damage or produce a large amount of precipitation after mixing can not be mixed, and which agents can or can not be mixed can be found in the instructions. A few pesticides have a synergistic effect on each other after mixing. For example, the efficacy of dimethoate neutral and acidic fungicides such as mancozeb, wettable sulfur and colloidal sulfur will not be reduced but will be improved. Drug resistance problems the long-term use of a single agent (mainly internal inhalation fungicides) will cause pathogens to develop drug resistance and invalidate the agents used. In order to avoid this problem, compound agents should be chosen, or a mixture of internal absorption fungicides and traditional fungicides should be used. Click to get more fungicide use technology click to get more pesticide use technology