The S. sclerotiorum disease starts from the middle and lower branches of the main stem of the plant. The lesions are water-stained, irregularly shaped, light brown or nearly white. They can spread around the stem and spread upwards and downwards. The stalks are broken and the diseased part produces a flocculent white hyphae, which produces black murine urea nucleus. The pith marrow becomes empty and the sclerotia occupy its space. The stem cortex is longitudinally torn at a later stage of drying. When the leaves are damaged, they appear as dark blue water stains, rot, and sometimes flocculent mycelium.
Control methods:
1, the ward must avoid continuous cropping of soybeans or sunflower or rape rotation or neighboring. More than one year of rotation with grass crops has a significant effect.
2. The sick field should be deep-rooted after harvesting, turning the sclerotia of the topsoil into the soil, and removing or burning the remaining stems in time to reduce the source of bacteria. Soybeans should be cultivated and cultivated in time before soybeans are sealed to prevent sclerotia from sprouting and unearthing or forming apium discs. Pay attention to draining silt, smoothing the land, and preventing the spread of water and water.
3. Remove the mixed sclerotia in the seeds.
4, sclerotia germination of soil to the ascendant plate formation period, in the soil surface spray 50% fast-king WP, about 30 grams per mu ~ 60 grams, add water, 40 kg to 50 kg spray. Or with 50% carbendazim WP 100 g per mu or 30% sclerotinable WP 50 g, plus 50 kg of water also has good results, but spraying the plant surface after the onset of poor results.
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