Nearly expect the County County Plant Protection Station to carry out a systematic survey of the tomato greenhouse in the county and found that the tomato shed disease rate reached more than 75%. It is hoped that the farmers can prevent and control the damage earlier to reduce losses.
symptom
The disease is a vascular disease that is caused by bacteria. It can occur in tomato seedlings until the end of the disease. 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 lower leaves wilted or curled, like water-deficient, 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, and turned brown in later stems. 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. To strengthen field management, it is necessary to avoid pounding and pruning when the dew is dry, and to carry out agricultural operations.
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.
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