How should fungicides be used to improve their efficacy?
How can fungicides be used to improve their efficacy? Please introduce the methods. To improve the efficacy of fungicides, you can refer to the following suggestions: Mix the concentration properly. Different fungicides have specific requirements for their use concentration. When mixing the concentration, you must strictly follow the "instruction manual" and must not increase or decrease it at will. ...
How can fungicides be used to improve their efficacy? Please introduce the methods
To improve the efficacy of fungicides, you can refer to the following suggestions:
Mix the concentration properly. Different fungicides have specific requirements for their use concentration. When mixing the concentration, you must strictly follow the "instruction manual" and must not increase or decrease it at will.
Choose the right spraying time. Spraying fungicides too late or too early will affect the control effect. Use the product in a timely manner according to the occurrence pattern and specific conditions of different crop diseases. It is usually best to use it before disease onset (protective application) or at the early stage of disease onset (preventive measures).
Master the number of applications. The number of fungicide sprays is mainly determined by the length of the pesticide's residual effect period and weather conditions. Generally, spray once every 10-15 days, for a total of 2-3 sprays. In special circumstances, such as rain after application, promptly apply one additional spray.
Improve application quality. The amount applied should be appropriate. Too much application will increase costs and easily cause phytotoxicity, while too little application cannot achieve the purpose of application. The quality of application should be emphasized. When spraying, the spray should be even, and every effort should be made not to miss any area.
Strictly prevent phytotoxicity. There are many reasons why fungicides cause phytotoxicity. First, pesticides with relatively strong water solubility are generally prone to cause phytotoxicity. Second, different crops also have different sensitivities to pesticides. For example, Bordeaux mixture generally does not cause phytotoxicity, but it can also cause phytotoxicity in copper-sensitive crops. Legumes, potatoes, and cotton are sensitive to lime sulfur mixture. In addition, different growth and development stages of crops also respond differently to pesticides. Generally, seedlings and the booting and flowering stages are prone to phytotoxicity. In addition, application under conditions such as high temperature and drought, strong sunlight, heavy fog, or high humidity generally easily causes crop phytotoxicity.
Be cautious about mixing pesticides. Many fungicides are alkaline pesticides, so they cannot be mixed with insecticides that easily decompose and become ineffective when exposed to alkaline substances, such as Bordeaux mixture and lime sulfur mixture, which are alkaline. Some fungicides, such as carbendazim, cannot be mixed with fungicides such as Bordeaux mixture, lime sulfur mixture, and thiophanate-methyl, as this will likewise cause the insecticidal (fungicidal) microorganisms to lose their physiological activity and insecticidal (fungicidal) ability and become ineffective.
Pay attention to avoiding pesticide resistance. The use of fungicides also involves the problem of crop disease resistance. To avoid disease resistance, on the basis of scientifically selecting pesticides, effectively alternate (rotate) the use of different types of pesticides, and strictly prohibit the long-term use of a single pesticide alone.
Click to get more fungicide application techniques
Click to get more pesticide application techniques