Leaf mould is an important disease in greenhouse tomato, and the epidemic period is from November to May of the next year. The temperature in the greenhouse is 20-25 degrees, and the relative humidity is more than 90%. The pathogenic bacteria are parasitized on the remnants of the disease and spread by airflow. Once onset, the epidemics are very rapid. In the short-term, the outbreaks occur within 7-15 days, and the general losses are 20%-30% and 50%-80% in severe cases. The pathogenic bacteria mainly invaded the leaves. At the initial stage, chlorotic spots appeared on the back of the leaves, and later became brownish-brown irregular mold layers. The corresponding parts of the leaf's front surface turned green and yellow. In severe cases, the leaves of the whole plant were curled, showing brown and dry. The prevention and control points are as follows:
Ecological control: Strengthen ventilation and disperse moisture, promptly remove old leaves and diseased leaves in order to facilitate ventilation and light transmission; strengthen cultivation and management, apply more phosphorus and potassium fertilizers, promote plant robustness and enhance disease resistance; choose sunny closed at noon to make greenhouse temperature Raise the temperature to 30-36 degrees for about 2 hours, then cool the ventilation to 25 degrees and close the tuyere. 7-10 days again.
Chemical control; from the initial fruit stage, spraying once every 10-15 days carbendazim 800 times solution, at the beginning of the disease, alternately spraying 75% chlorothalonil 600 times solution, 50% carbendazim 1000 times solution, 5 to Sprayed once a day for 7 days and sprayed for 3 to 4 times with good control effect.
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