Tomato spot disease is mainly harmful to the leaves, the initial onset of brown ring-like spots, after expansion to near-circular or long elliptical-shaped yellow-brown lesions, ranging from 0.3 to 1.5 mm in diameter, with yellow halo circles on the outer edge of the lesion. The middle part has a distinct chamomile brown pattern. When the humidity is high, the surface of the lesion is dark gray mold. In severe cases, the leaves die and fall.
Control measures: 1. Agricultural control. Reasonable close planting, ventilation and dehumidification; avoid partial application of nitrogen fertilizer, increase application of organic fertilizer and phosphorus and potassium fertilizer; timely drainage; clean the pastoral, remove sick and residual. 2. Chemical control. In the early stage of the disease, medication. 50% carbendazim WP 1000 times solution + 75% chlorothalonil WP 1000 times solution, 36% thiophanate-methyl suspension dose 500 times solution spray. Every 10 days ~ times, 2 to 3 times in a row, can effectively prevent tomato spot disease.
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