How should fungicides be applied to improve their efficacy?
What methods can improve the efficacy of fungicide application? Please provide guidance. Fungicide application can refer to the following methods: Reasonably configure the concentration. Different fungicides have special requirements for their use concentration. When configuring the concentration, you must strictly follow the "instruction manual"; do not arbitrarily increase or decrease it. Select the correct spraying...
What methods can improve the efficacy of fungicide application? Please provide guidance.
Fungicide application can refer to the following methods:
Reasonably configure the concentration
Different fungicides have special requirements for their use concentration. When configuring the concentration, you must strictly follow the "instruction manual"; do not arbitrarily increase or decrease it.
Select the correct spraying time
Spraying fungicides too late or too early will affect the control effect. Use the pesticide promptly according to the occurrence patterns and specific conditions of different plant diseases. It is usually best to use it before the disease occurs (protective application) or in the early stage of the disease (preventive measures).
Master the number of applications
The number of fungicide sprayings is mainly determined by the length of the pesticide's residual effect period and meteorological conditions. Generally, spray once every 10-15 days, for a total of 2-3 times. In special circumstances, such as rain after application, a supplementary spraying should be carried out promptly.
Improve application quality
The amount applied should be appropriate. Applying too much will increase costs and easily cause pesticide damage, while applying too little will fail to achieve the purpose of application. The quality of application should be careful. When spraying, the spray should be uniform, and every effort should be made not to miss any areas.
Strictly prevent pesticide damage
There are many reasons why fungicides cause pesticide damage. First, pesticides with relatively strong water solubility are generally more likely to cause pesticide damage. Second, different plants also have different sensitivities to pesticides. For example, Bordeaux mixture generally does not cause pesticide damage, but it can also cause pesticide damage to copper-sensitive plants. In addition, plants react differently to pesticides at different growth and development stages. Generally, seedlings and the booting and flowering stages are more prone to pesticide damage. Moreover, under conditions such as high temperature and drought, strong sunlight, heavy fog, or high humidity, pesticide application is generally more likely to cause crop damage.
Be cautious about mixing pesticides
Many fungicides are alkaline pesticides, so they cannot be mixed with insecticides that easily decompose and become ineffective when encountering 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, as this will also cause the insecticidal (fungicidal) microorganisms to lose their physiological activity and insecticidal (fungicidal) ability, making them ineffective.
Pay attention to avoiding drug resistance
The use of fungicides also involves the issue of crop disease resistance. To avoid disease resistance, on the basis of scientifically selecting pesticides, it is necessary to effectively alternate (rotate) the use of different types of pesticides, and it is strictly forbidden to use one pesticide alone for a long time.
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