After rain and snow turned green, the outside temperature dropped sharply, which caused the temperature in the greenhouse to decrease, and then the temperature dropped, affecting the growth of vegetable roots. When I visited the grassroots, I found that in the low-temperature and high-humidity greenhouse environment, gray mold, sclerotia, ulcer disease, disease, powdery mildew, leaf mold, bacterial spot disease, stem rot, bacterial Diseases such as soft rot and dead trees have high incidence. How can we effectively prevent the occurrence of diseases? These agricultural operations must be followed up in a timely manner. Early detection of diseases after the weather turns fine After the weather is fine, be sure to observe the plants in the greenhouse in time, especially the plants with high humidity and the front position of the greenhouse. The first time the diseased plants are found to be handled in a timely manner, this is the key period for disease prevention and control, to prevent the spread of pathogen spores. Cause a large area of ​​transmission harm and cause unnecessary losses. For Sclerotinia, Botrytis cinerea, leaf mold, and powdery mildew, we must first use the lighter to burn the diseased fruit and then burn the moldy layer and then wrap the diseased part in a plastic bag. Out of the shed, effective prevention and control of pathogenic spores spread a large area of ​​harm, and then symptomatic medication. For diseases such as epidemics, ulcers, and stem rot, the diseased area was found by first scraping the diseased area with a knife and then adjusting the agent (such as Garrinone + Mn-Zn flumorph or Greenhenge 6 + Captan). Paste on the affected area and kill pathogens in the first time to avoid transmission hazards. For sheds where sclerotinia, gray mold, leaf mold, powdery mildew, and ulcer disease are extremely severe, it is recommended to adopt a comprehensive plan that combines the use of aerosols for the prevention and control of smoke fog. There are no dead ends. However, special attention must be paid to the reasonable choice of aerosol dose and fog time to avoid the harmful side effects of damaging the leaves, affecting flower bud differentiation and pollination. After rain and snow, watering the greenhouse must be careful After continuous cloudy weather and clear rain and snow, the outside temperature dropped sharply, the resistance of the plants decreased, and the physiological and biochemical functions were temporarily in disorder. Therefore, it is not advisable to pour sheds immediately. The vegetable farmers can choose to continue for 2 to 3 days in a sunny day. First, raise the temperature of the greenhouse, and then raise the ground temperature before pouring the shed. After pouring the shed, we must immediately take a high-temperature air release dehumidification method, on the one hand is conducive to raising the ground temperature, on the other hand is conducive to quickly discharge the humidity inside the shed to avoid the spread of disease damage. The reason why the shack is not recommended immediately after the cloudy day is clear is that: First, the continuous cloudy weather and rain and snow conditions, coupled with the decline in the temperature outside the boundary, will cause a drop in the ground temperature. If water is immediately applied at this time, it will increase the decline in ground temperature. It has an adverse effect on the growth of the root system and can easily lead to the occurrence of physiological yellow leaves and other physiological problems. Second, the rapid decline in outside temperature will cause a decrease in the greenhouse, which will lead to a decrease in the ground temperature. Immediately pouring the shed will cause a slow rise in ground temperature. At the same time, we must remind everyone that this stage is at the coldest time of the year. When irrigating the shed, it must be accompanied with no hormones to protect the roots and roots, avoid falling ground temperature, low root activity, and poor absorption of mineral elements. Slow swelling, affecting flower bud differentiation, weak plant growth, and physiological yellow heading occur. Spring and Autumn Vegetables In view of the problem of dead trees caused by bacteria and pythium in the current spring chillies, after each successive rainy weather turns fine, it will show an outbreak trend. This is because spring pods and chillies are now in flowering and fruit setting period, and the demand for nutrition is increasing. The large, combined with the continuous cloudy and rainy weather, caused the humidity in the greenhouse to increase, creating powerful conditions for the infection of bacteria and pythium. After continuous cloudy weather and clear rain and snow, plant transpiration increased. Bacteria through the vascular bundle conduction speed up the speed, and thus speed up the pathogenesis, resulting in obvious symptoms of dead trees. In this regard, we reminded farmers in general that we must observe the lower leaves of the pepper plants at the sheds from 11am to 13:30pm on sunny days (that is, during the high temperature period of the greenhouses). If the lower leaves of the plant branches occur, the lower leaves appear. Weakness, and the phenomenon of normality in the upper part, can be initially determined to be the current high dead tree (bacteria and pyomyces are infective). At this time, we must dig out the root system for final confirmation, and then immediately apply the symptomatic medication; Timely detection and timely prevention and treatment, the sooner the disease is detected, the more timely and the lower the loss. For this, you can choose to spray chitin for remission, if the duration is not long, it will not cause great damage to the plant. Also need to remind everyone is that after the weather is fine, for the disease can not correctly determine the problem of shed vegetables, we must consult professional plant protection technicians, after correct identification and correct use of drugs, to avoid misdiagnosis and delay the best timing of prevention and control Unnecessary loss. Disclaimer: Some articles in this website have been transferred from the Internet. 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After the rain and snow, it is necessary to follow up on the management of these vegetables.