Key points for scientific application of fungicides
April 30 08:09:21, 2023
Agricultural fungicides are chemical pesticides that directly kill spores and mycelia of fungi or bacteria, or inhibit the growth and development of pathogens.
1 Agricultural fungicides must be used before and during the onset of crop diseases. The principle of killing insects and killing insects is to see insects and insects, see killing, that is, only when the insects or aphids reach a certain amount per unit area, the control can achieve satisfactory results. However, sterilization is not the case. The principle of sterilization is based on prevention, supplemented by prevention and treatment, that is, before the occurrence of damage to the bacteria or in the early stage of the damage. Active prevention and control should be carried out. If the disease has caused harm or caused harm, the prevention and treatment will be carried out. Even if the best bactericidal agent is used, the effect will not be satisfactory. Sometimes it will reach a level that is difficult to control, resulting in a reduction or no harvest for fruit tree production.
2 Types of fungicides There are two types of agricultural fungicides: protective fungicides and systemic fungicides. The protective fungicide only protects the fruit trees, and has no therapeutic effect, while the systemic fungicide can kill the invading germs and play a therapeutic role, and the protective effect is not obvious. Protective fungicides are used to prevent disease intrusion. After spraying, a protective film is formed on the surface of the tree to prevent contact between the bacteria and the leaves. However, when the germ has invaded and is in the stage of incubation, the protective agent will not work. Therefore, the protective fungicide is preferably used best before or during the occurrence of the disease. Systemic fungicides are used to kill invasive diseases and are most effective in the early stages of disease. When the disease occurs seriously, the use of the systemic agent is to use the drug several times, and the effect will not be too good, which will have certain effects on the growth of the tree and the fruit. Therefore, to control the disease, it must be used before or at the beginning of the disease.
3 points of attention (1) When disposing the disinfectant, it should be noted that the liquid is evenly mixed. The bactericide is generally classified into a wettable powder, a powder, a suspension, and the like. In the case of a suspending agent, a part of the water is generally injected into the medicine barrel first, and then the required agent for the concentration is added, stirred and mixed, and then the required water is added in an amount sufficient to be used after being uniformly stirred. Powders and wettable powders are even more so. (2) The effect of the fungicide has a lot to do with the quality of the spray. It should be noted that the liquid sprayed from the sprayer must be foggy rather than water droplets. The protective fungicide must form a protective film, and the front and back sides of the blade are evenly sprayed and covered completely, so that the drug can be fully exerted. Otherwise, it will cause a large number of invasive bacteria, and will not be able to prevent disease. (3) In the process of agricultural control, people often use bactericidal insecticide liquids together to achieve comprehensive prevention, labor saving and time saving. The systemic fungicide is used for a long time, and the bacteria are easy to produce drug resistance. Therefore, it should be used in combination with mancozeb and inorganic sulfur to delay the development of resistance to the systemic dosage form. When the fungicide is mixed with insecticides, acaricides or other fungicides, it depends on the physical and chemical properties of these agents, whether chemical reactions will occur, so as not to affect the efficacy. Such as mancozeb can not be mixed with copper preparations, mercury preparations, strong alkaline pesticides, stone sulfur mixture can not be mixed with copper preparations such as Bordeaux mixture, mechanical oil emulsion and pesticides that are easily decomposed under alkaline conditions. If it must be used in production, there should be a certain safety interval when using the drug. The general interval is 7 to 10 days.
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