Botrytis cinerea is a major disease in greenhouse tomatoes in recent years. It can occur in both seedling and adult stages. Flowers, fruits, leaves and stems can be harmed, especially green fruits are the most seriously affected, affecting tomato yield and quality. Very big. Several methods of prevention are described below. Agricultural control strengthens cultivation and management, appropriately increases the application of phosphorus and potassium fertilizer, and improves the disease resistance of plants. Promote drip irrigation and submerged dark irrigation technology to prevent flooding. In the early stage of the disease, the residual petals and stigma were removed in time, the diseased leaves and diseased fruits were removed, and the diseased plants were removed. The whole shed was sprayed with the general guard to prevent the spread of the disease.
Ecological control aims to increase temperature and moisture, and strengthen ventilation management. The specific method is: close the shed in the morning on sunny days, when the temperature reaches 28 ° C -30 ° C for 1 hour, start to put the top wind, continue to release air at noon, the temperature is maintained at 20 ° C -25 ° C. When the temperature reaches 18 °C-20 °C in the afternoon, the vents are closed, the night temperature is maintained at 14 °C-16 °C, and the relative humidity is maintained at 70%-80%. On a cloudy day, you should also ventilate at noon for a short time.
Before the planting and controlling, the new high-fat film 600 times liquid was mixed with carbendazim WP 500 times to spray the seedlings to prevent the bacteria from entering the shed. In the early stage of the disease, the new high-fat film 600 times liquid was used together with the targeted agent for spraying prevention and control. Spray once every 7-10 days, even spray 3-4 times. Botrytis cinerea is easy to produce drug resistance, and the dosage and the number of application should be minimized during the prevention and treatment, and attention should be paid to the rotation and alternate use.
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