I. Main Diseases of Chinese Cabbage Nutritional Products ,Nutrition Supplement,Health Supplement Vitajoy Biotech Co., Ltd. , http://www.suaminoacids.com
1. Cabbage Downy Mildew: Polygonal or irregular shaped lesions appear on diseased leaves, white moldy material on the back, and yellowish leaves when heavy.
Control methods: At the beginning of the disease, spray 25% metalaxyl WP 800 times, or 75% chlorothalonil wettable powder, 70% Mancozeb WP, 64% WP WP 400 to 500 times Liquid, or 40% EB aluminum wettable powder 200 to 300 times liquid.
2. Cabbage virus disease: When the disease occurs, the leaves appear mosaic, shrinkage, necrotic spots, streaky streaks and other symptoms, from the seedling stage to the heart of the package can be susceptible. In particular, 6 to 7 leaves of the seedlings are sensitive to the disease.
Control methods: In the early stage of disease, spray 20% virus A WP 500 times solution or 15% plant disease Ling emulsion 1000 times, spray once every 10 days, and spray 2~3 times.
3, cabbage soft rot disease: generally wounded by the invasion of the base of the vegetables, the initial water stains, after the expansion and turned light brown, the organization was soft rot, with a foul odor.
Control methods: In the early stage of disease, spray 100-150PPM of agricultural streptomycin, spray once every 7-10 days, and spray 2 or 3 times. Or spray neomycin with 3000 times solution.
Second, the main diseases of radish
1, radish virus disease: general manifestations of mosaic, shrinkage and deformity, the main methods of prevention and control is the selection of disease-resistant varieties and timely control of aphids.
2, radish soft rot disease: diseased leaves were water-like, the central part of the root was a white soft rot, there is a foul odor, often brown juice oozing. The control method refers to cabbage soft rot.
Third, late cabbage main disease
1. Cabbage black rot: The adult stage causes leaf spot or yellow veins. The leaf spot develops inward from the leaf margin, forming a "V"-shaped yellow-brown spot. The veins become darker, the cortex of the roots and stems decay, and the vascular bundles turn black and dry.
Control methods: 2 to 3 years of rotation with non-cruciferous vegetables; seed disinfection, soaking in water at 50°C for 20 minutes before sowing, or immersing in water at 55°C for 10 minutes, or using 55% U.S. .
2. Cabbage soft rot disease: In the ball stage, watery stains often appear on the outer leaves or the base of the leaf bulbs. The outer leaves recover from wilting at noon and soon afterwards, and then the leaf bulbs rot at the base, showing a dirty white mud and smelly. The control method is basically the same as that of cabbage soft rot.