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Tomato canker disease is a vascular disease caused by bacteria that can develop from tomato seedlings to fruiting. Seedling disease begins at the margin of the leaf, gradually wilting from the lower part, and the stem is ulcerated. When the seedling is severe, the seedlings die. Plants infected, the initial lower leaves withered or curled, appear to lack of water, one or part of the leaflets withered, the inside of the stem became brown, expanded upwards and downwards, finally sagged or cracked, gave birth to many adventitious roots, later in the stem turned brown Even hollow, the last plant died. When the diseased plant was cut, brown rot was found in the middle, and when the humidity was high, the white fungal pus was also spilled in the stem. There are necrotic spots on the surface of the fruit, with slightly raised white dots on the fruit surface. The diameter of a single lesion is about 3 mm. The center is a brown corked process called the "bird's eye spot." This is a special symptom of the disease, sometimes Together form an amorphous ward. Control methods: l. Strictly quarantine the species used for tomato production to prevent its spread. 2. After soaking in warm water of 55°C for 30 minutes, rinse and dry to germinate. 3. Use a new seedbed or nursery with nutrients. The old seedbed is sterilized with 40% formalin (30 ml) plus 3 to 4 liters of water, covered with a plastic film for 5 days, and then sowed after 15 days. 4. Implement non-sorbaceous crops for more than 3 years of rotation, timely weeding, to avoid dew operation. 5. Strengthen field management to avoid farm operations such as squashing and pruning when the dew is dry. 6. The diseased plants were found to be removed in a timely manner, and 14% of ammonia solution was used as a 300-fold solution, 50% of copper chloride was used as a wettable powder 500 times solution, and 77% was used as a wettable particulate powder 500 times, 72% for agricultural use. Streptomycin sulfate wettable powder 4000 times, 47% Garnett 600-800 times, 50% DT500 times and other spray control.