Pay attention to prevention of Botrytis cinerea in greenhouse

Tomato gray mold occurs mainly in greenhouse cultivation facilities, leaves, flowers and fruits are affected. The incidence of leaf blade was more inward than the tip of the leaf. The lesion was light-colored to yellow-brown. The diseased part of the disease was dry and brown-brown mildew. When the flower was onset, it caused burnout; , First from the residual rancidity and stigma first dip dyeing, and then to the fruit development, resulting in soft rot of young fruit, mature lesions on the green fruit stains, gray, gray fruit on the surface after the dense moldy material. In recent days, more rain, less light, resulting in continuous low temperature and humidity in the shed, extremely unfavorable to the growth of tomatoes, will lead to the occurrence of gray mold, hope all local farmers attach great importance to strengthen the prevention of gray flowers and fruits of gray mold.

Prevention advice: 1, choose sunny and timely to do a good job in greenhouse ventilation, ventilation management, reduce the humidity within the greenhouse. The relative humidity of the air in the shelter shall not exceed 65%, which is one of the effective measures to control and prevent the occurrence of Botrytis cinerea. At the same time, take care to remove dust from the film and ensure that there is sufficient light in the shed. 2, removal of diseased leaves, diseased fruit, diseased branches, brought out of the shed to focus on deep buried or burned to reduce the source of bacteria. At the same time, sprinkle a little lime around the diseased plants to prevent disease, use potassium dihydrogen phosphate and other efficient foliar fertilizers for extra-root fertilizer, promote healthy growth of plants and improve resistance to disease. 3. Chemical control: Adding 0.2% quick-drying wettable powder when preparing plant growth regulators can effectively prevent Botrytis cinerea from infecting flowers and reducing the incidence of disease. It is also possible to use 65% jebumycin 1000 times, 50% polymyosmolone 1000 times, 50% fluocinonide 1000 times, etc., spray control every 7 days or so, 2-3 times in a row, pay attention to the use of the above medicaments alternately, the leaves are positive Both sides must be sprayed.