Tomato spot blotch often occurs in tomato cultivation. At the time of onset, the leaves near the ground start old leaves and spread upwards. The back of the leaves has water-spotted small round spots, and the edges appear dark brown on the front and back sides and the center is gray. Circular or near-circular, slightly concave lesions, scattered on the top of a small amount of small black spots, serious when the sink into a large spot, so that leaves gradually yellow, premature aging of plants, causing early defoliation; stem and fruit disease, lesions near Round or oval, slightly concave, brown, with small black spots scattered on it.
Prevention
1, a reasonable rotation, the cultivation of disease-free strong seedlings. The seeds were collected from the disease-free healthy plants and soaked for 30 minutes at a temperature of 52°C with a new high-fat film at 800°C for 30 minutes before sowing and then germination. Seedbed seedlings were planted with new soil or two years without planting solanaceous vegetables. The seedlings were immediately sprayed with 800 times the new high-fat lipid film on the surface after sowing to protect the soil, prevent soil knots, and increase seedling emergence rate.
2, strengthen the cultivation and management, increase phosphorus and potassium fertilizers, improve disease resistance, pay attention to the field, timely pruning, drainage and dehumidification, remove the sick, remove old leaves, promote air and light. At the same time, the timely spraying of Huawang 3 inhibited the growth of the main tip and promoted flower bud differentiation. Spraying Zhuang Ti Ling before flowering enhanced pollen quality, enhanced the rate of fruit set in circulation, and resulted in continuous and stable production of high quality tomatoes.
3, chemical control, the initial stage of disease should be sprayed according to the requirements of plant protection 70% mancozeb, 75% chlorothalonil, 70% thiophanate-methyl and other targeted agents for prevention and treatment, every 7-10 days, continuous 2- 3 times, and with the spraying of new high-fat membrane 800 times liquid to enhance efficacy, improve the utilization of effective pharmaceutical ingredients, consolidate the control effect.

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