Tomato Bacterial Diseases and Prevention

In the investigation, the science and technology personnel in the park discovered that the current occurrence of tomato bacterial wilt is serious, which has a certain impact on production. Disease Symptoms: Tomatoes generally do not exhibit symptoms at the seedling stage. When the infected plants enter the diseased period, the top leaves are wilted and droop, then the lower leaves wither, and the middle leaves finally withering, while in others, one leaf is wilting or the whole leaf is wilt at the same time. At the early stage of disease, the diseased plants are wilted during the day and recover in the evening. The disease is called light green. The epidermis of the diseased stem is rough. The adventitious roots or adventitious buds are proliferated in the lower part of the stem. When the humidity is high, the diseased stems can be seen as brown in diameter after initial immersion. One to two centimeters in the plaque, the vascular bundle is brownish as seen through the epidermis, and the stem is squeezed across the diseased stem. It can be seen that the vascular bundles overflow from the white pyomema septum; the onset rate is rapid and the onset of severe plants is 7-8 days. You can die and remain green after death. Control methods: 1. Strengthen cultivation management, use formula fertilization, avoid flood irrigation. 2. When a sporadic diseased plant is found, it should be immediately removed and the lime be sterilized. 3. Chemical control: At the beginning of the disease, 72% of agricultural streptomycin sulfate WP can be used to irrigate the roots at a rate of 4000 times. Each tube is filled with 0.5 kg of good liquid, every 10 to 15 days, once per irrigation, and 2 to 3 times of irrigation. .

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