Cabbage black spot, also known as black mold, has a tendency to expand and increase in the southwestern region in recent years. It can reduce production by 20% to 50% in the epidemic year and has become one of the major diseases in cabbage production. In addition to cabbage, black spot disease also harms cruciferous vegetables such as cabbage, cauliflower, celery, mandarin, and radish. Symptoms: Onset begins with the outer leaves. Both sides of the leaves are long lesions, round or nearly round, the color is light brown or brown, with obvious concentric ring pattern, there are often yellow halo around the lesion, the lesion has a long black mildew. Due to the expansion of the lesions, they formed a large number of dead spots, resulting in the dead leaves of the whole plant. Petiole lesions are fusiform, dark brown. The lesions on the pods are nearly circular with a pale gray center, a brownish rim, and a light brownish brownish rim. The stalk stems are more densely spotted, and the leaves are dead when severe, and the seed pods are distressed and lean. Control methods 1. Seed treatment: Use 75% chlorothalonil or 50% thiram for wet dressing, the dosage is 0.4% of the seed weight; use 50% acetaminophen wettable powder, seed weight, seed weight 0.2% to 0.3%. Second, the cultivation and management: 2 to 3 years of rotation for dumping, remove the sick plants, drainage ditch drainage, and in the Mushi 75 to 100 kg of nitrogen fertilizer on the basis of increased application of 40 kg of phosphate fertilizer, 18 kg of potash to increase cabbage disease resistance. Third, the chemical control: the initial incidence of the following wettable powder pesticide spraying: 75% mancozeb 500 times, 75% chlorothalonil 600 times, 58% metalaxyl zinc 500 times, 50% 500 times of mycotoxin, 50% of thiophanate-methyl 500 times, 64% of antiviral 500 times, 50% of acetaminophen 1500 times. The above drugs are all wettable powders. Spray it once every 7 days or so. After the rain, make up the spray and spray it 2 or 3 times.
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