Tomato bacterial wilt disease and prevention

Disease symptoms: Tomato seedlings generally do not show symptoms. After entering the fruiting stage, the top leaves are wilting and drooping, then the lower leaves are wilting, and the middle leaves are wilted. In the early stage of the disease, the diseased plants wilted during the day, recovered in the evening, the disease became light green, the diseased stems were rough, and the roots and lower parts of the stems proliferated with adventitious roots or adventitious buds. When the humidity was high, the diameter of the diseased stems became brown after being initially immersed. 1 to 2 cm of plaque, the vascular bundle is brown, and the stalk is cut by hand. It can be seen that the white bacterium pus overflows from the vascular bundle of the cut surface; the disease rate is faster, and the plant with heavier incidence is 7-8 days. It can die, and it will remain green after death.

Control methods: 1. Strengthen cultivation management, adopt formula fertilization to avoid flooding. 2. When a sporadic diseased plant is found, it should be removed immediately and disinfected with lime in the hole. 3. Chemical control: In the early stage of the disease, 72% of agricultural streptomycin sulfate wettable powder 4000 times liquid can be used for root irrigation, each plant is filled with 0.5 kg of good liquid, every 10 to 15 days, once every 2 to 3 times. .

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