First, see the weather spray
If the weather is not too bad, either choose to spray in the morning, otherwise do not spray. To choose a spray with a finer spray or a better atomization, spray evenly. Do not spray too much on the young shoots and young parts of the crop. Do not spray directly at close range. Do not drop the liquid, do not form a large dew point, and the leaf surface is not wet before the cover.
Second, do not spray immediately after the sunny day
After a few days of continuous cloudy weather, the leaf surface of vegetables is thinned due to long-term photosynthesis, yellow and tender, and the fibrous tissue is weak. At this time, spraying is easy to cause phytotoxicity. It should be ventilated for 2 to 3 days before spraying. If the leaves of vegetables are severely wilting, it is necessary to take a way to put a straw curtain in time. If the shed film is dirty, do not rush to wipe, and then wipe the leaves after the leaves are not wilting.
Third, reduce the dilution of the drug solution or reduce the total amount of medication, lengthen the interval between sprays
Because the optimum interval of most pesticides is about 10 days, if there is no special disease, it is best to spray the drug once every 10 days to protect the vegetables from disease. It is best not to mix a variety of pesticides at the same time. Vegetable diseases in greenhouses in winter are severe, and some farmers will spray once every 5 days, which is highly undesirable.
4. Pyrimethanil or the word "oxazole" or "alcohol" should not be used.
The drug for treating gray mold and sclerotinia disease contains more than 20% of pyrimethanil, spraying for a long time on the cloudy day, slow evaporation, and the specificity of pyrimethanil, spraying on sensitive crops such as eggplant and cowpea. The leaf surface is prone to brown spots, and it is best to use it with caution or not. Of course, there are many medicines that contain higher pyrimethanil components, but the packaging does not necessarily indicate that the vegetable growers do not know about it beforehand. It is best to apply a large area after a small area test. In addition, the active ingredient contains the word "oxazole" and "alcohol". It has the side effect of inhibiting the growth of crops, and it is easy to produce dwarf strains. The weather is not suitable for crop growth, and if it is sprayed, the growth of this crop will be more Affected.
Five, cloudy day, not shed
The air in the cloudy sky shed is not smooth, which may cause the accumulation of harmful gases, and the smoked shed is more likely to cause gas damage. If some vegetables have white leaves or yellow leaves, some flower buds, young fruits and so on are easily detached. Most vegetable farmers mistakenly believe that cloudy sheds are a good way to use drugs. I don't know if the weather will not turn fine the next day after the shed, or if the weather is still cloudy and snowy, it will seriously affect the environment inside the shed and cause crop damage.
6. Prudent spraying of dust
Even cloudy days are high-risk periods of various diseases such as gray mold, sclerotium, blight, downy mildew, and bacterial. When the disease is serious, do not rush to cure the disease and produce powder poisoning in a single dose. Because many of the dusts contain not only pyrimethanil, but also ingredients such as "oxazole" or "alcohol", there may be components such as sclerotia that are prone to phytotoxicity. The correct method of application is to spray powder in the space between the rows of crops. Do not spray directly on the foliage or plants. The amount of use should be strictly in accordance with the instructions.
More pesticide knowledge , please pay attention to China Pesticide Network
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