First, the harm symptoms
Bacterial leaf blight mainly damages the leaves, petioles, stems, tendrils, and fruits of cucumber. The leaves were infected, and the initial leaf margins produced water-soaked spots. After the enlargement, the lesions were irregularly shaped. The edges were yellow halo rings, and the center was light brown and expanded toward the middle of the leaves. In severe cases, large watery lesions develop. Bacterial pus is not easy to see on the back of diseased leaves and can be distinguished from bacterial angular spot disease. Petiole, stem, tendril infected, lesions were brown, water-immersed. The fruit is infected, starting from the pedicel and initially producing water-soaked spots on the pedicel. The resulting handle is brown, yellowing, and dehydrated. When the humidity in the field is high, the diseased part produces milky opaque mucus, that is, bacilli.
Second, control methods
1. Seed and seed treatment. Harvest seeds from disease-free plants and use disease-free seeds. When introducing commercial seeds, seed treatment should be done before sowing. It can be soaked in warm water at 50°C for 20 minutes, then removed by drying and germination.
2. Strengthen field management. For cultivation in protected areas, trenches should be cleared in time to prevent accumulation of water after rain, timely ventilation and ventilation. The management of fertilizers and waters should be lightly poured. The watering and fertilizing should be on a sunny morning, and the greenhouse film should be promptly opened for ventilation and dehumidification.
3. Rotation. It is advisable to implement a year round rotation with non-cucurbit crops in order to reduce the source of field germs.
4. Clean the pastoral. In the event of disease, timely removal of the old leaves, clean the pastoral after harvest, remove the body of the disease, and bring deep outside the field or burned, deep-sweeping the soil and accelerate the decay of the sick body.
5. Chemical control. At the beginning of the onset of spraying, spraying once every 7-10 days, spraying 2-3 times. Pharmacy can be used: 47% Garrinone WP, 72.2% Precic water-soluble liquid, 77% rotatable WP, etc. It can also spray 72% agricultural Streptomycin wettable powder +75% 100% Bacterial strain wettable powder for prevention and treatment.
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