Bacterial spotting of tomatoes mainly damages the leaves of tomatoes, stems, fruits, and stalks can also be infected. Diseases can be found at the seedling stage and adult plant stage. When the leaves become infected, the lower old leaves first develop disease, and they spread upward with the development of the disease. Leaves produce water spotted small dot spots, expanded lesions dark brown, round or irregular shaped lesions, the diseased leaves when the light perspective, visible lesions around the yellow halo, the disease in the late stage of the disease becomes Brown or black, if the lesions occur on the veins, multiple lesions can be continuously strung along the veins, resulting in deformed leaves. The germs are suitable for a warm and humid environment. The suitable temperature for germs is 18-28°C; the optimal temperature for disease is 20-25°C and the relative humidity is above 90%; basically, no disease occurs below 15°C or above 30°C.
Control methods: 72% of streptomycin 3000-4000 times or 20% of Yekutizole 800-1000 times (add 10% difenoconazole 1500 times), spraying once every 5-7 days, when serious Can be sprayed 3-5 days, can effectively control the occurrence.
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