Cabbage, cabbage, radish, rape, cauliflower, etc. are cruciferous vegetables. Its common disease characteristics and control methods: 1, black spot lesions occur on both sides of the leaf, round to nearly circular, diameter 2-10 mm, light brown, with obvious concentric ring pattern, often surrounded by yellow halo, its Microscopic fine black mold, the pathogen. Petiole long rhabdomorphous lesions, dark brown, a black ring turns black mold, causing leaves to fall off when severe. The leaves, stems, peduncles, and seed pods of the planting strains can be killed. The lesions on the stem and pedicel appear oval and dark brown. Control methods: Use 75% chlorothalonil wettable powder 500-600 times, or 70% mancozeb wettable powder 400-500 times, or 58% metalaxyl manganese zinc wettable powder 500 times, in Spray before onset. Use liquid 50-60 kg per 667 square meters, once every 10 days, continuous control 2-3 times. 2, white spot disease Cabbage, radish disease leaves early scattered white round spots, after the expansion of the light gray round to near-round lesions, diameter 6-18 mm, lesions around the edge of dark green halo. The margins of the lesions on the back of the leaves are sometimes inconspicuous. When the disease is severe, the lesions form a continuum and the leaves die. The lesions are not easy to perforate. Control method: Spray 25% carbendazim WP 400-500 times, or 40% carbendazim suspension 800-1000 times, or 50% carbendazim 800-1000 times in the early stage of disease. , Or 50% thiophanate-methyl wettable powder 500 times, or 70% mancozeb wettable powder 400-500 times. Spray 50-60 kilograms per 667 square meters, every 15-20 days, spray 2-4 times. 3. Sclerotinia mostly occurs at the base of the stems and stems of planted vegetables, sometimes with petiole and pods. The lesions were yellowish-brown at the beginning of the lesion, and turned gray afterwards. Finally, they all rancid. The black worm-like sclerotia or the white mycelial sclerotia were seen in the diseased part. Control methods: spraying 5% speed Keling WP 2000 times, or 50% TOPZONE 500 times, or 50% carbendazim 600-800 times, or 40% Nuclear net wettable powder 1000-1500 times. Spray liquid 50-60 kg per 667 square meters, once every 10 days, continuous control 2-3 times. 4. White rust mainly damages the leaves. The lesions are mainly on the back of the leaves, with a pale yellow color at the beginning, and no obvious margins. There are small uplifted small borers in the lesions, with a size of about 1-4 mm. The mature epidermis ruptures and a white powdery substance is distributed, that is, the pathogenic bacteria. Conidia, lesions for a long time, diseased leaves withered yellow, only a green circle around the lesion, when the pedicels of the seedlings were killed, the flower axis was swollen and deformed. Control methods: spraying 25% metalaxyl wettable powder 1000 times, 58% metalaxyl manganese wettable powder 500 times, or 64% poisonous M8 wettable powder 500 times. Spray 40-50 kg per 667 square meters, once every 7-10 days, continuous prevention and treatment 1-2 times.
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