This is tomato bacterial brown spot, also known as bacterial spot disease or bacterial leaf spot. In the seedling stage and other growth period can be harmful. The leaves were affected and were initially spotted as water-stained spots. They expanded into irregular spots, black or dark brown, and had no ridges. When the humidity was low, the membrane-like and invented spores were found on the lesions on the back of the leaves.
Control methods: pay attention to controlling the humidity of the seedbed and the field. In the early stage of disease, use 20% Yezizole for 500 times or 3% for 500 times for Zhongshengmycin or 20% for TCB 600 times.
Note: The use of drugs at seedling stage, for the sake of safety, the dosage can be halved, and when spraying, it can be even and detailed.
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