Ulcer disease is a bacterial vascular disease. Tomato seedlings can develop ulcers during the fruiting period. Leaves, stems, flowers, and fruits can be affected. The seedling stage started from the leaf margins of the lower leaves of the plant. The diseased leaves increased upwards, and the upper and lower parts gradually wilted and drooped. It looked like water shortage. The edges and veins of diseased leaves turned yellow, and the leaves turned brown and died. Some seedlings in the hypocotyl or petiole produce ulcer-shaped depression stripe spots, pathogenic seedlings dwarfed or withered. The adult pathogenic bacteria invade from the stem, expanding from the phloem to the pith. Sometimes many bird eyes form an amorphous ward together. The bird's eye spot is a specific symptom of the fruit of tomato ulcer disease. It is caused by re-dyeing, and it does not necessarily occur with a stem system infection.
The cause of the disease can be overwintering on the inside and outside of the seed and on the diseased body, and can live for 2-3 years with the diseased body in the soil. The disease is mainly invaded by a variety of wounds, but also from the plant stem or pedicel invade, into the fruit of the vascular bundle of embryos, invade the seed umbilical or seed coat, causing seed bacteria. When diseased and healthy fruits are mixed and harvested, the bacteria will contaminate the seeds and cause the seeds to carry bacteria. The seeding rate of the seeds is generally 1%-5%, and the seriousness may reach 53.4%. In addition, pathogens can also invade directly from the epidermis of the trichomes and young fruit of the leaves. The long-distance transmission of the disease mainly depends on the transport of seeds, seedlings and unprocessed fruits. Near-distance transmission mainly depends on rainwater and irrigation water, especially continuous rain and storm, and agricultural operations spread and spread. Warm and humid, long duration of heavy condensation.
Control method In the early stage of tomato canker disease, use the plant cell membrane stabilizer (Laccarum tianda 2116) 25 g + veterinary florfenicol 2 bottles (10 ml/3.6 g) + veterinary norfloxacin ( 50g / 1.25g) + 2.5g of silicone mixed with 15kg of water sprayed. After spraying, the greenhouse film was wiped to increase the light transmittance in the shed, and the temperature was increased to 40°C for 3-5 hours. In order to prevent the seedlings from being exposed to high temperature hazards, spray the tomatoes with water and spray before spraying. Field investigation confirmed that 48 hours after spraying, the lesions on the fruits began to decline, and the lesions disappeared at 72 hours. After 48 hours of supplemental spraying, the ulcer lesions were healed and no longer relapsed. The control effect was very satisfactory. According to statistics, the application of this method to control tomato canker disease can recover economic losses of 7,000 yuan per 667 tons. The tomato pesticide residues produced are extremely low or no pesticide residues can be detected, which fully meets the quality requirements of class A green agricultural products.
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