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Fungicides Application Technology
Jun 27, 2017

A class of pesticides used to control plant diseases caused by various pathogenic microorganisms, generally referred to as fungicides. The use of fungicides is a cost-effective way to control plant diseases. As the application of fungicides more complex technology, Fungicides so the pace of development as fast as pesticides, but the role of fungicides on agricultural production has been increasingly recognized by the majority of farmers, with the modernization of China's agriculture, the development of fungicides will accelerate.

The use of fungicides (including water and wettable powder) spray, you need to use water to dyed or diluted into the appropriate concentration. Fungicides Different fungicides use the concentration of its special requirements, the concentration must be strictly in accordance with the instructions to operate, not free to increase or shrink. If the concentration is too high can easily cause phytotoxicity, Fungicides and the concentration is too low to achieve the effect of drug prevention and treatment of disease.

In general, spraying the fungicide time too late or too early will affect the control effect. Spraying too early not only cause waste, but also reduce the control effect. And spray time is too late due to a large number of pathogens have been intruding into the host or cause harm, Fungicides then even if the spray suction therapy, but also because of the results of the remedy. Therefore, the use of fungicides should be based on the occurrence of different diseases and crop prediction and forecast the occurrence of disease and the specific circumstances of the timely use of drugs. Usually the time of the fungicide should be in the pre-onset (protective medication) or early onset (take preventive measures) is better.

The quality of the spray of the fungicide includes the amount of medication and the quality of the spray. The number of drugs should be appropriate, Fungicides too much medication on the one hand will increase the cost, on the other hand is also very easy to cause injury. And medication too little can not achieve the purpose of medication. Medication quality to pay attention to spray when the requirements of fine fog, Fungicides spray evenly, to spray the stem and leaves the plant on the positive and negative, and strive to do not leak spray.

Fungicides cause phytotoxicity for a variety of reasons, the first general water-soluble drugs prone to phytotoxicity, followed by different crops on the sensitivity of the drug is also different, such as Bordeaux liquid generally does not cause injury, but the copper-sensitive crops Can also produce phytotoxicity. Beans, potatoes, cotton is the stone sulfur mixture sensitive, the higher the probability of injury. Fungicides In addition, the response of the different growth and development stages of the crop is different. Fungicides The general seedling and booting stage are prone to phytotoxicity. In addition, phytotoxicity and weather conditions such as temperature, sunshine, etc. also have a certain relationship, the general high temperature and drought, strong sunshine or fog, high humidity and other conditions are easy to cause crop injury.

Fungicide is a lot of alkaline pesticides, it can not be encountered with the decomposition of alkaline substances easy to decompose pesticides, Fungicides such as Bordeaux mixture, stone sulfur mixture and other basic can not and 1605, dimethoate, dichlorvos mixed use, Fungicides otherwise Resulting in a lose-lose. There are also some fungicides such as carbendazim, Beauveria bassiana and so can not be mixed with Bordeaux liquid, lime sulfur mixture, thiophanate and other fungicides, the same will cause insecticide (bacteria) microbial loss of physiological activity and insecticide (bacteria) ability Failure. In addition, some of the mixed chemical reaction and cause injury can not be chaotic mandarin duck spectrum. Of course, not all of the fungicide can not be mixed with other pesticides, Fungicides a small number of fungicides and pesticides can also play a synergistic effect after mixing. For example, dimethoate and acid bactericidal, such as dioxins or wettable sulfur or colloidal sulfur and other mixed, Fungicides not only will not affect the efficacy of play, but also improve the role of efficacy.

The use of fungicides also exist crop disease resistance problems, long-term use of a single agent (mainly within the fungicide), will lead to pathogen resistance, Fungicides even if repeated use of drugs to no avail, or even intensified. In order to avoid drug resistance, Fungicides to scientifically select the basis of pesticides, do a good job of different types of pharmaceutical alternating (rotation) use, is strictly prohibited long-term use of a single pesticide