1. Cabbage downy mildew: Polygonal or irregular shaped lesions appear on the diseased leaves, white mold on the back, and yellow leaves on heavy leaves.
Control method: In the early stage of the disease, spray 25% metalaxyl WP 800 times liquid, or 75% chlorothalonil WP, 70% mancoze WP, 64% antivirus WP WP 400-500 times Liquid, or 40% ethyl aluminum phosphate wettable powder 200-300 times solution.
2, cabbage virus disease: onset, the leaves appear mosaic, shrinkage, necrotic spots, streaking dwarf and other symptoms, from the seedling stage to the core period can be susceptible. In particular, 6-7 leaves of seedlings are sensitive to the disease.
Control method: In the early stage of the disease, spray 20% virus A wettable powder 500 times liquid or 15% phytopathogenic emulsion 1000 times liquid, spray once every 10 days, even spray 2-3 times.
3, cabbage soft rot: generally invaded by the roots of the vegetable roots, initially water-stained, then enlarged and turned into light brown, the tissue is soft and rot, with a foul smell.
Control method: In the early stage of the disease, spray 100-150PPM agricultural streptomycin, spray once every 7-10 days, even spray 2-3 times. Or spray 3000 times solution of neomycin.
Second, the main diseases of radish
1, radish virus disease: generally expressed as mosaic, shrinkage and deformity, the main control methods are to select resistant varieties and timely control of aphids.
2, radish soft rot: diseased leaves are water-stained, the center of the root is stained with white soft rot, there is a foul smell, often brown juice oozing. The control method refers to cabbage soft rot.
Third, the main disease of late cabbage
1. Cabbage black rot: The leaf spot or yellow vein is caused by the onset of adult stage, and the leaf spot develops inward from the leaf edge to form a “V†shaped yellow-brown spot. Black veins, roots rot incidence cortex, vascular black dry rot.
Control methods: with non cruciferous vegetables 2--3 as rings; seed disinfection, 50 deg.] C or 20 minutes water Soaking 55 ℃ 10 minutes before sowing seed soaking water, or in 55% methylene-bis-fu amount of 0.4% by seed dressing .
2, cabbage soft rot: constant outer leaves of cabbage leaves or water-soaked spots appear ball base, an outer leaf wilting noon and evening recovery, and thus decay base leaves the ball, as a dirty white sludge, bad smell.
The basic control methods and cabbage soft rot same.
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