What should I pay attention to when using fungicides?

What should I pay attention to when using fungicides? Is there any netizen to help introduce that agricultural fungicide is a kind of pesticide used to prevent and cure plant diseases caused by various pathogenic microorganisms, generally refers to fungicide, how to use it improperly, the effect will be greatly reduced, and it will also cause drug damage to crops; the seed net has sorted out seven key points that need to be paid attention to in the process of using fungicides, which are listed below for netizens' reference. Point 1, fungicide application time: early application time will cause pesticide waste or reduce efficacy; too late will cause a large number of pathogens to invade the host, even if sprayed for treatment, there will be little effect. Point 2, the concentration of fungicides: when spraying with liquid agents, it is often necessary to mix or dilute the agents into appropriate concentrations with water. Too high concentration will cause drug damage and waste, and if the concentration is too low, there will be no effect. For some non-wettable or difficult to wetting powder, you should first add a little water, adjust the liquid into a paste, and then add water to configure the use. Third, fungicide application times: fungicides are generally sprayed every 10-15 days, a total of 2-3 times can be sprayed, after spraying rain, should be supplementary spraying. When using fungicides, we should pay attention to consider the cost and save the use of drugs. Point 4, the principle of mixed use of fungicides: pesticides that are easy to decompose and fail with alkaline substances should not be mixed with alkaline pesticides. For example, alkaline fungicides Bordeaux solution, stone sulfur mixture, etc., should not be mixed with 1605, dimethoate, dichlorvos, etc., otherwise chemical reactions will occur. Drugs that can cause drug damage can not be mixed. A small number of pesticides can play a synergistic effect after mixing. For example, when dimethoate (neutral) is mixed with alkaline fungicides (such as Dysen zinc, available sulfur, colloidal thinning, etc.), the efficacy will not be affected, but will be slightly improved. Point 5, alternate use of different types of fungicides: long-term single use of fungicides (mainly internal absorption fungicides) will make pathogens produce drug resistance, make the conventional use of drugs invalid, and increase the difficulty of prevention and treatment. In order to avoid the emergence of drug resistance, different types of agents should be used alternately, such as the mixed use of internal absorption agents and traditional fungicides. Point 6, the methods of spraying crops: the amount of spraying should be appropriate, and the amount of spraying is too small, so that all parts of the plant can not be carefully protected; too much is easy, causing drug damage and waste. Spraying should be fine and evenly sprayed, and should be sprayed to both the front and back of the plant. Main point 7. Prevention of drug damage: there are many reasons for drug damage to plants caused by drug application, and drugs with strong water solubility are prone to drug damage. The sensitivity of different crops to chemicals is also different. For example, Bordeaux liquid generally does not cause drug damage, while beans, potatoes and cotton are sensitive to stone-sulfur mixture and are easy to cause drug damage. The response of crops to pesticides is also different in different development stages. Generally, drug damage is easy to occur in seedling stage and booting and flowering stage, so it should be used with caution. In addition, drug damage is also related to weather and meteorological conditions. Click to get more fungicide use technology click to get more pesticide use technology