How to choose fungicides?

How to choose fungicides? Which fungicides are good? Please introduce that the planting area of vegetables in China has exceeded that of oil crops and has become the main crop in our country. The biggest problem in vegetable production is the control of diseases and insect pests, especially the control of diseases, which is a difficult problem in vegetable production. In the prevention and control of vegetable diseases, in addition to the use of agricultural, physical, ecological and other control measures, chemical control is one of the most frequently used measures. In chemical control, fungicides are used most widely and frequently. Among all kinds of diseases of vegetables, downy mildew and blight are the most common diseases in both seedling stage and other stages. In order to prevent and cure these two diseases, in the late 1980s and early 1990s, China launched amide fungicides such as germicidal alum after the first batch of substituted benzene fungicides metalaxyl and Redomir. As this kind of drug has significant protective and therapeutic effects, it has been widely used in the prevention and control of downy mildew and blight, and has played an important role in production. However, it should be pointed out that the action site of this kind of fungicide is single, and once the action site changes, it will inevitably lead to resistance of bacteria. For a long time, the decline of drug efficacy due to the emergence of drug resistance has been common. Production practice shows that in some traditional vegetable producing areas, the resistance of pathogens is strong, and the use ratio of fungicides is decreasing day by day (at present, it has dropped to 200% 300 times), not only the cost of control has been greatly increased, but also the control effect has decreased from 70% 80% at the initial stage to 30% 40% at present. Therefore, many experts suggest that while doing a good job in comprehensive prevention and control, new pesticides should be selected scientifically and used alternately in prevention and control. In view of the above situation, here to recommend to the broad masses of farmers two kinds of environment-friendly excellent fungicides for the prevention and control of downy mildew and epidemic diseases. One, Anke. Anke is produced by BASF, Germany, and its dosage form is 20% dry suspension. in 2000, it was recommended by the Drug Inspection Institute of the Ministry of Agriculture as the first choice for the treatment of downy mildew and blight. The drug has triple prevention and control functions: first, prevention function to prevent the invasion of bacteria; second, treatment function, which can infiltrate plant tissue to kill bacteria; third, anti-spore production function to prevent pathogen spore formation and avoid plant re-infection. Anke has good dispersibility, strong osmosis and internal absorption, and is resistant to Rain Water scouring. The efficacy is not affected in case of rain one hour after application, with a validity period of 7 to 10 days, and can quickly kill bacteria resistant to other fungicides with a multiple of 25003000. It can be widely used in melons, tomatoes, tobacco, potatoes, leafy vegetables, beans and other crops. Second, Kejia. Kejia is a pesticide produced by Japan Ishihara Industry Co., Ltd., with a dosage form of 10% gel suspension, which has a good control effect on downy mildew and blight. The drug has high biological activity and can hinder the development of pathogens at various growth stages with a multiple of 2500 to 3000, so it is a super protective fungicide. Its chemical structure is unique (cyanoimidazole), and its action site is different from other fungicides. It can effectively control pathogens that have been resistant to common fungicides, such as Kelu, alum, metalaxyl and so on. Its validity period can be as long as 10-14 days, is safe for crops, can be mixed with a variety of pesticides, and is not afraid of rain after application. It is commendable that the product is slightly toxic, does not harm bees, lacewings and other beneficial organisms, is safe to the ecological environment, and is a kind of environment-friendly green pesticide. Click to get more fungicide use technology click to get more pesticide use technology