In the low temperature and high humidity vegetable sheds in winter, low temperature makes vegetables grow slowly, yield is low, and high humidity is more likely to cause disease prevalence. How to use the medicine in the winter greenhouse? The following is a detailed introduction by the Chinese pesticide network :
First, choose different medications according to different weather.
In sunny weather, you can choose from a variety of treatments such as spraying, fumigation, and dusting; but in rainy weather, you can only choose to smoke or spray to prevent disease. Because it is easy to increase the humidity in the shed during the rainy weather, it can not achieve the ideal disease prevention effect, so it can be replaced by fumigation or dusting. Smoke or dusting can achieve the purpose of uniform use without increasing the humidity in the shed, so as to avoid the incomplete leakage of the spray.
Second, arrange the spraying time reasonably.
Spraying in winter generally chooses to use the medicine after dry leaves in the morning or in the afternoon, but avoid using it at high temperature during noon. Smoked tobacco is generally used in the evening, but should choose different fumigation time according to crops and medicines. For example, if the bean and vegetable are smoked, the strain should be smoked for about 6 hours after 12 o'clock in the evening to prevent the smoke from being smoked. Too long affects crop growth. Spraying powder can be used in sunny mornings or in rainy weather, and the leaf condensation effect is better.
Again, carefully spray the drug containing the growth inhibitor.
Generally, "azoles" are widely used to control diseases, but they have a role in inhibiting the growth of vegetables. Therefore, care must be taken when using such agents. Because of the long time of dew condensation and slow evaporation in the winter, it is easy to produce dwarf strains because of the side effects of inhibiting crop growth. If you encounter a cloudy weather after spraying, crop growth will be more inhibited.
In addition, do not spray pesticides immediately after turning cloudy.
After a cloudy cloudy day, the leaf surface of the vegetables is not strong due to prolonged photosynthesis, resulting in thin, yellow and tender leaves, and weak fibrous tissue. At this time, the application is easy to cause phytotoxicity, and should be ventilated for 1-2 days. Spray again. If the leaves of vegetables are severely wilting, it is necessary to use straw blinds in time, or use a warm water spray of about 25 °C to alleviate the wilting caused by water shortage in the leaves. If the shed film is dirty, do not rush to wipe it, and then wipe off the leaves after the plant leaves stop wilting.

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