How should fungicides be used to improve control effectiveness?
How can fungicide application be made more effective? Here is an introduction to methods. How to use fungicides efficiently in production is of great significance for increasing crop yields. The following introduces methods for improving fungicide effectiveness for reference: Reasonably prepare the concentration. When using fungicides (including liquid formulations and wettable powders)...
How can fungicide application be made more effective? Here is an introduction to methods.
How to use fungicides efficiently in production is of great significance for increasing crop yields. The following introduces methods for improving fungicide effectiveness for reference:
Reasonably prepare the concentration. When using fungicides (including liquid formulations and wettable powders) for spraying, the agent must be mixed with water or diluted to an appropriate concentration. Different fungicides have their own special requirements for use concentration, and when preparing the concentration, the "instruction manual" must be strictly followed, and it must not be arbitrarily increased or reduced. If the concentration is too high, it can easily cause phytotoxicity, while if the concentration is too low, it will not achieve the effect of controlling the disease.
Choose the spraying time accurately. Generally speaking, spraying fungicides too late or too early will affect the control effect. Therefore, when using fungicides, they should be applied in a timely manner according to the occurrence patterns of different crop diseases, forecast and prediction, and the specific situation of disease occurrence. Usually, the application time of fungicides should be 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 residual effectiveness period of the agent 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, promptly supplement with one additional spray.
Improve application quality. The spraying quality of fungicides includes the amount used and the quality of spraying. The amount used should be appropriate. Using too much will, on the one hand, increase costs, and on the other hand, easily cause phytotoxicity. Using too little will fail to achieve the purpose of application. The quality of application must be careful. When spraying, the droplets should be fine and dense, and the spraying should be even. The stems and both sides of the leaves of the plants should be sprayed thoroughly, striving to avoid missing any area.
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. For example, Bordeaux mixture, lime sulfur mixture, and others that are alkaline cannot be mixed with 1605, dimethoate, dichlorvos, and others, otherwise it will cause "mutual destruction." Some fungicides such as carbendazim and Beauveria bassiana cannot be mixed with fungicides such as Bordeaux mixture, lime sulfur mixture, and thiophanate, as this will likewise cause the insecticidal (fungicidal) microorganisms to lose their physiological activity and insecticidal (fungicidal) ability, thus becoming ineffective. In addition, some mixtures that produce chemical reactions and cause phytotoxicity also cannot be randomly matched. Of course, not all fungicides cannot be mixed with other pesticides. A small number of fungicides can also play a synergistic role after being mixed with pesticides. For example, dimethoate mixed with acidic fungicides such as zineb or wettable sulfur or colloidal sulfur will not only not affect the exertion of efficacy, but will instead also improve the efficacy.
Pay attention to avoiding drug resistance. Long-term use of a single agent (mainly systemic fungicides) will cause pathogens to develop resistance. Even repeated application many times will be of no help, and may even make matters worse. To avoid disease resistance, on the basis of scientifically selecting pesticides, effectively carry out the alternating (rotation) use of different types of agents, and strictly prohibit the long-term separate use of one pesticide.
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