Recently, shed vegetable growers in Wangtun Village, Lintoutun Township, Yutian County, reported that the planting of tomato disease was heavy, the leaves had long black moldy spots, and the lesions were irregular, and the farmers were not even treated several times according to leaf mold. Effective. The technical staff of the Liangjiadian Agricultural Technology Station immediately went to the shed to check the condition and diagnosed it as Tomato BPH. Coal-mildew disease is one of the common diseases of tomato, and the field sometimes mixes with leaf mold, and the symptoms are easily confused with leaf mold.
The main difference between the two is that tomato leaves have an irregular pale yellowish green spot on the leaf surface, a white, moldy white back, and a grayish brown or dark brown color on the back. With the development of the disease, the leaves gradually curled from the lower to the upper, and the plants were yellow-brown and dry. In the case of B. hyodysenteriae, yellowish green patches were produced on the back of the leaves, near-circular or irregularly shaped lesions, and the edges were not obvious. On the surface of the lesions, villous villous fungi were found. When the conditions were appropriate, the mold layer expanded rapidly and covered the entire leaf. The leaf appeared light to yellow-green spots on the front, the edges were not obvious, and the lesions gradually turned brown in the late stage. When the disease was severe, the diseased leaves withered. Stems and petioles were infected, and green spots were formed and covered with a thick layer of brown mold.
Both can be spread by air currents and people's agricultural activities. Appropriate onset temperatures are around 25°C, and indoor air is relatively susceptible to high relative humidity.
Tomato Bacillosis control methods: selection of disease-resistant varieties. More than 3 years of rotation with non-sweet potato vegetables were implemented in the plots to reduce the source of field bacteria. Promote the cultivation of deep sorghum sorghum, rational close planting, drainage drainage system, drainage in time after rain, reduce the groundwater level, apply sufficient basal fertilizer, increase phosphorus, potash fertilizer, promote plant growth robust, improve plant disease resistance. Remove diseased bodies in time, buried or burned outside the shed. In the early stage of onset of spraying, 50% of thiophanate-methyl WP can be used as an agent, 500% of thiophanate-methyl WP can be used, 500% of 50% Sulphur Suspension Mixture, or 800-900 times of 65% Metalaxyl WP. Spray once every 7-10 days, spray 2-3 times continuously.
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