In summer, rainfall increases, because agricultural facilities appear to be exposed to rain in the aging market, or the terrain is relatively low. Many greenhouses have accumulated water and the humidity is too high. The generation of germs, first of all, the humidity requirements are relatively high, the humid rain is large, the humidity in the greenhouse may reach 100%, which is very beneficial to the germination of the spores; secondly, the rise in temperature is also very beneficial to the growth of the mycelium of the pathogens. Can quickly invade the host, causing disease. Continuous high temperature and rainy weather can continuously generate multiple infection cycles, which is very beneficial to a wide range of disease outbreaks.
   High temperatures cause the dispersibility of the biocolloids to decrease, the ester compounds become layered, the enzyme activity decreases, and in severe cases, the cell structure is destroyed. High temperature will also affect the respiration intensity of plants, causing the carbohydrate synthesis in plants to be hindered, and the dissimilation effect is greater than the assimilation, especially under the condition that the illumination is not enough and the temperature is too high, the plant reverse growth is the most serious. . When producers are in production management, they should take precautionary measures to prevent problems before they occur.
   In order to prevent large-scale outbreaks of greenhouse horticultural plant diseases, producers need to do two things: one pair of environmental disinfection treatments, and the other is to apply the medicine without losing the opportunity.
   Some practitioners believe that the disease is not significant, as long as the ventilation work is done, it will not cause harm to the crop. In fact, it is not that the overall growth environment is deteriorating and the plants are becoming weak. The combination of the two is a period in which flowers are seriously ill.
   For example, if the environment for flower growth is not thoroughly sterilized, the breeding bacteria will be transmitted through the following ways: First, the temperature in the lower part of the night will be slightly reduced, and the water droplets on the leaves of the plant will be invaded by the bacteria from the stomata; For mechanical damage to the plant, the pathogen will invade from the wound. When it encounters a high temperature of 28 degrees Celsius to 35 degrees Celsius, it is not well ventilated. The bacteria in the greenhouse are clustered and the disease will be very fast. Third, the substrate humidity is constant. Increase, root activity declines, and soil-borne diseases will increase.
   Therefore, you should pay attention to the management:
   1. Disinfect the ground after draining the water, spraying lime powder, carbendazim, etc. under the seedbed and on the walkway on the ground;
   2 , need to increase ventilation, especially at night, the intensity of ventilation, internal circulation should be increased;
   3. Increase the proportion of potassium and calcium fertilizers, cultivate robust plants, and improve the plant's own resistance to disease;
   4. Spray the systemic and preventive pesticides without losing the opportunity to eliminate the pests and diseases before they are harmed;
   5. When the diseased plants are found, they should be removed in time and removed from the greenhouse for deep burial or burning.
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