Winter even cloudy vegetables medication prevent disease precautions
First, look at the weather spray If Tianyin is not powerful, choose to spray in the morning, otherwise do not spray. To choose a sprayer with a finer spray or atomization, spray evenly. Do not spray too much on the tender shoots and tender parts of crops. Do not spray them directly at close range. Do not drip with liquid medicine. Do not make large dew points. Second, reduce the liquid dilution concentration or reduce the total amount of drug, lengthen the spraying interval The current medication, according to the usual drug concentration of 3/4 to match the pesticide, it is best not to mix a variety of pesticides at the same time; such as the usual management of 4 barrels per mu of medication, even the low temperature conditions can be reduced to 3 barrels of drug. Of course, according to the length of cloudy days and the types of crops and the tenderness of the foliage, the concentration of pesticides and the amount of pesticides can be controlled flexibly. In winter greenhouses, greenhouse diseases occur seriously. Some vegetable farmers spray once every 5 days. The optimal spraying interval for most pesticides is about 10 days. Therefore, especially when it is cloudy, farmers should not spray pesticides. If there is no special disease, it should be sprayed once in 10 days to protect the vegetables from disease. Do not spray immediately after sunny days Even after a few days of cloudy days, the leaves of the vegetables are not strong due to prolonged photosynthesis, causing the leaves to be thin, yellow and tender, and the fibrous tissue is weak, which is prone to injury. Should be ventilated, see the light after 2-3 days before spraying, if the vegetable leaves have a serious phenomenon of wilting in a timely manner to pull a put a straw shade defect mode. Or use warm water (25 °C ~ 30 °C) plus 150 grams of sugar, love to receive more than 3 ml of water 15 kg method to spray relief. If the shed film is dirty, do not rush to wipe it, and then wipe clean after the leaves of the plants are not wilting. If the disease is severely irritated and sprayed, the drug solution can be mixed with 1 bag of S-receptor, 1 capsule of fresh amine fat, and at the same time, strengthen agricultural operations to achieve comprehensive prevention and treatment. IV. Caution should be exercised in the use of pyrimidine or "acyl" or "alcohol" components. Cloudy mildew, sclerotinia and pyrethroids containing more than 20% of the best to use or not to use caution, cloudy, long time condensation, volatile evaporation, due to the special nature of the composition of pyrimethanil, especially in Leaves of susceptible crops such as eggplant and cowpea are susceptible to brown spots. Of course, there are many medicines that contain high levels of pyrimethanil but are not necessarily labeled on the packaging. The vegetable growers do not know beforehand. It is better to use a small area before spraying and then use it in large areas. An agent containing the word "azole" or "alcohol" in the active ingredient has the side effect of inhibiting the growth of the crop, and it is easy to produce dwarfed plants. The continuous cloudy weather is not suitable for crop growth, and it is even more affected by the growth of inappropriate crops. V. Cloudy smokers must be cautious Even cloudy days, because the air in the shed is not smooth, it may cause the accumulation of harmful gases and cannot be discharged outside the shed in time. Therefore, under the cloudy conditions, the smoke shed is more likely to produce gas damage. For example, vegetables have young leaves that have white or yellow leaves, and some flower buds, young fruits, etc. are easily detached after being damaged by air. Most vegetable farmers mistakenly believe that cloudy smoked sheds are a better way to use drugs. They do not know that if the weather on the second day after the shed is not able to turn to sunny weather or cloudy weather and cannot release the wind, it will seriously affect the shed environment and cause crop damage. Therefore, it is necessary to combine weather forecast with cloudy smoked sheds. Six, dusting agent should pay attention Even the cloudy days are high incidence of various diseases such as gray mold, sclerotia, epidemic disease, downy mildew, and bacterial diseases. When the disease is severe, do not rush to cure the disease and produce excessive doses of powder and produce phytotoxicity. Because many dust agents contain not only pyrimethanil or the word “azole†or “alcoholâ€, there may be components such as sclerotia that are easily harmed by traditional Chinese medicine. The correct method of drug use is to spray powder in the space above the rows of crops. Do not spray directly against the foliage or plants. Use the amount according to the instructions. Seven, to symptomatic medication Even cloudy days often lead to mixed diseases of greenhouse vegetables, gas damage, fertilizer damage, phytotoxicity, and physiological diseases. The actual production of vegetable farmers should be careful to distinguish between them, and they should be given appropriate medications. Otherwise, they are blindly treated according to the disease. The prevention and treatment has aggravated the adverse symptoms of vegetables and affected the production.
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