If it can't clear up even cloudy days after 10, how to manage cucumbers?

1, reduce humidity and increase light.

Everyone should do everything possible to reduce the humidity in the shed. If possible in the morning, you can properly open the tuyere (about 10 minutes) to discharge moisture. In addition, even if it is cloudy, the drafting felt should be pulled out, otherwise the plants will not be able to carry out photosynthesis and will become weaker and weaker. If the conditions are good, you can also use a fill light to increase the light;

2. Strengthen cultivation management and do farm work well.

The more severe weather conditions are encountered, the more careful management is needed, such as destroying redundant leaves, reducing nutrient consumption on the one hand and reducing humidity on the other. Also, once leaves, flowers and young fruits with serious diseases are found, they must be picked up in time, wrapped and thrown away, and don't bother, otherwise a large number of sick and disabled people will be left behind, which will easily cause large-scale diseases. Pay attention to getting rid of the sick and disabled.

3. Choose appropriate chemicals to prevent and treat diseases scientifically.

Use of smoke generating agent:

During this period, diseases with low temperature and high humidity were the main diseases. If it is prevention, smoke can be considered. Because the smoke agent is simple to use, does not increase humidity, and the drug is evenly dispersed, even on cloudy days, but we must pay attention to the weather forecast to ensure that the tuyere can be opened the next day. As for the types of smoke agents, chlorothalonil can be used to control most fungal diseases, and procymidone, iprodione and other smoke agents can also be considered to control gray mold and Sclerotinia sclerotiorum. It also has a certain effect on some leaf spot diseases.

Preparation of organic copper:

Because of the high humidity, leaves will have problems such as water film, which will lead to bacterial angular leaf spot of cucumber, tomato canker and bacterial rash. Therefore, we can consider using copper clothianidin (Longke), copper succinate (DT), copper rosin, copper nitrohumate and other organic copper preparations to prevent bacterial diseases, and copper can also prevent fungal diseases. Remind everyone here that it is best not to use inorganic copper preparation, because

Choosing the right drugs for high and low fungi;

Among the common vegetable diseases, cucumber downy mildew, tomato late blight, pepper blight, eggplant cotton blight and other diseases caused by lower fungi can be selected. Manganese-zinc, frost urea? Manganese zinc, propamocarb hydrochloride, flupirone? Propamocarb (Yinfali), etc.

Leaf spot diseases such as tomato early blight are caused by higher fungi, so azoxystrobin+triazole can be considered for control. Of course, if it is serious, it is recommended to choose oxazole ether? Fluoroamide (Jianda), benzamide? Azoxystrobin (Amisi), flupirone? Oxime phthalein (Lunasen) and other agents, in order to achieve better control effect.

4, after a sunny day, pay attention to prevent flash seedlings and sunburn.

Continuous cloudy days, the plants themselves will have a certain adjustment ability to adapt to the adverse environment. However, if it is sunny after the rain, the light in the greenhouse will increase and the temperature will rise, but the soil temperature will rise relatively slowly, and it is easy to flash seedlings and burn in the sun. Therefore, it is suggested that you should pay attention to shading at noon after sunny days. You can use shading nets or reduce the grass felt by one third, so that crops can gradually adapt to this process.