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Rhizoctonia solani seedling stem base produces oval-shaped brown lesions, the seedling stems become brown after expansion, and contracture and thinning. Stems and leaves are wilted during the day and they can return to normal sooner or later, and die a few days later, but they are not as easy to fall as lodging. Cause of the disease: sowing too dense, too much water, stuffy and wet inside the bed. Prevention and control technology: choose a high-lying, well-drained place to build a seedbed; 2 to 3 weeks before sowing, per square meter of seedbed with 40% formaldehyde, 50 ml of water, 6 to 12 kg of water poured on bed soil, closed stuffy for 4 to 5 days; found disease When using the strain, use 75% chlorothalonil 1000 times solution or 55% bleomycin 800 times solution; when the humidity is too high, use the above-mentioned agent to mix with dry fine soil, or apply it with proper amount of hay ash.
The gray mold disease department was light brown with a gray moldy layer on the surface. Control methods: Strengthen ventilation management, control watering, remove diseased bodies in time, spray 50% Botulinwettable powder 600 times, or 50% Pentazoin WP 1000 times, or 50% speed Ke Ling WP 2000 times, 7 to 10 days spray 1, spray a total of 2 or 3 times.
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