The changeable weather will greatly affect the small environment in the shed, and the types of diseases will also change greatly. The most serious occurrence of gray mold, sclerotinia and downy mildew in the low temperature season has been reduced, but the occurrence of virus disease, powdery mildew and leaf mold has been aggravated. Vegetable farmers are reminded to prevent diseases in time according to weather changes.
In high temperature and strong light weather, the focus is on the prevention of viral diseases
In fine weather, the temperature in the shed often exceeds 30 degrees Celsius, and the temperature in the shed is high and the humidity is low, which is very conducive to the occurrence of viral diseases. To prevent viral diseases, we must first adjust the small environment in the shed. After the beginning of summer, the light gradually increases, the temperature gradually increases, and the shading and cooling will become the focus of the next management. At present, there are two main kinds of shading measures commonly used: one is to set up the shading net in advance, according to the light situation, flexibly adjust the shading time and shading rate, is conducive to prolonging the time of suitable environment in the shed; If you are planting vegetables for summer, vegetable farmers can also install spray cooling facilities, which can increase air humidity and reduce the occurrence of viral diseases while cooling down.
After the virus disease infects the plant, it has two states: hidden and overt. When a virus infects a strong plant, it will show a hidden disease, so improving the stress resistance of the plant is the key to preventing viral diseases. To improve the stress resistance of plants, we must raise roots and supplement nutrition. During the vegetable growth period, vegetable farmers can apply chitin, alginic acid, humic acid, biological fertilizer and other functional fertilizers to promote root growth, enhance nutrient absorption capacity, and significantly reduce the occurrence of viral diseases. At the fruit-swelling stage, the nutrient deficiency of plants is an important predisposing factor for the occurrence of viral diseases. In addition to supplementing nitrogen, phosphorus and potassium fertilizers, calcium fertilizers can be applied in advance after fruit set, which can greatly improve the stress resistance of plants.
In rainy weather, the focus is on preventing bacterial diseases
In rainy weather, the high temperature and humidity in the shed cannot be released, which is easy to induce the occurrence of various bacterial diseases. Vegetable farmers are reminded that as long as the rainfall is not very heavy, the vent should be kept open for ventilation. After heavy rain, open the vent in time to avoid high temperature and humidity in the shed. Natural orifice, pruning, leaf thinning, leaf thinning, fruit picking, etc. are the main entrance of bacterial infection, and vegetable farmers should try to reduce the wounds caused by plants, especially on cloudy days, try not to engage in pruning, pruning, leaf thinning, vine falling and other agricultural operations.
Among the pesticides for the prevention and control of bacterial diseases, antibiotics and copper pesticides have a good effect on bacterial diseases, and vegetable farmers should use drugs in time before or at the beginning of the disease. The environment of high temperature and humidity is conducive to the reproduction of biological bacteria, and vegetable farmers can spray biological pesticides such as Pseudomonas fluorescens and Bacillus polymyxosis for prevention and control.
The weather is changeable, and the prevention of vegetable diseases should be introduced here, I hope it will be helpful to everyone. If you want to buy high-quality and high-yield vegetable seeds, you can download the seed bank App, and the country's excellent vegetable varieties are available for everyone to choose.
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