How to apply agricultural fungicides?

How to apply agricultural fungicides? Please introduce the method of agricultural fungicides are chemicals that can directly kill spores and mycelium of fungi or bacteria, or inhibit the growth and development of bacteria. The main results are as follows: 1 Agricultural fungicides must be used before or at the initial stage of crop diseases, which is different from killing insects and mites. The principle of killing insects and mites is to see insects and mites, that is, satisfactory results can be achieved only when the population or mites reach a certain number per unit area. While sterilization is not the case, the principle of sterilization is to give priority to prevention, supplemented by prevention, that is, before the occurrence of bacterial harm or the initial stage of harm. Active prevention and control should be carried out. If the disease has been harmful or caused harm, and then control, even if the use of the best fungicides, the effect will not be satisfactory. Sometimes it will even reach the degree that it is difficult to control, resulting in reduced or no harvest for fruit production. 2 types of fungicides there are two types of agricultural fungicides: protective fungicides and internal absorption fungicides. Protective fungicides only protect fruit trees, but have no therapeutic effect, while internal inhalation fungicides can kill invading bacteria and play a therapeutic role, and the protective effect is not obvious. Protective fungicides are used to prevent disease invasion. After spraying, a protective film is formed on the surface of the tree to prevent bacteria from coming into contact with the leaves. But when the pathogen has invaded and is in the incubation stage, the protective agent does not work. Therefore, it is best to use protective fungicides before or at the initial stage of the disease. The internal absorption fungicide is to kill the invaded disease, and it has the best effect in the early stage of the disease. When the disease is serious, the use of internal inhaler, that is, more than a few times, the effect will not be very good, and it will have a certain impact on tree growth and fruit. Therefore, to control the disease, it must be used before or at the initial stage of the disease. 3 several points for attention (1) when configuring fungicides, attention should be paid to mixing the solution evenly. Fungicides are generally divided into wettable powder, powder, suspension and other preparations. As far as the suspension agent is concerned, generally, part of the water is injected into the medicine bucket, and then the medicament needed to prepare the concentration is added, and then the required water is mixed well, and then it can be used after mixing evenly. This is especially true when powder and wettable powder are used. (2) the effect of fungicide is closely related to the quality of spray. It should be noted that the liquid sprayed by the sprayer must be in the form of a fog rather than water droplets. Protective fungicides must form a protective film, spray evenly on both sides of the leaves and cover them all, so that the power of the medicine can be brought into full play. Otherwise, it will cause a large number of germs to invade and fail to achieve the purpose of disease prevention. (3) in the process of agricultural control, people often mix germicidal and insecticide solution together to achieve the purpose of comprehensive control, labor-saving and time-saving. When internal absorption fungicides are used for a long time, bacteria are easy to produce drug resistance, so they should be used in conjunction with mancozeb and inorganic sulfur to delay the development of bacteria resistance to internal inhalers. When fungicides are mixed with pesticides, acaricides or other fungicides, it depends on the physical and chemical properties of these agents and whether chemical reactions will occur so as not to affect the efficacy. For example, mancozeb cannot be mixed with copper preparations, mercury preparations and strongly alkaline pesticides, and stone-sulfur mixture cannot be mixed with Bordeaux liquid and other copper preparations, mechanical oil emulsions and pesticides that can be easily decomposed under alkaline conditions. If it must be used in production, there should be a certain safety interval, usually 7 to 10 days. Click to get more fungicide use technology click to get more pesticide use technology