The symptoms are also known as sheath blight. At the end of the 1970s, the mustard rape in Shandong and Henan provinces in China were serious. The petiole was infected with a pitted spot near the ground. When the humidity was high, a light brown spider silky hyphae appeared on the spot. The stem base was infected with primary yellow patches, which gradually turned into brownish water stains, then turned into gray-black depression spots, and some invaded stems and formed numerous sclerotia.

The pathogen Phizoctonia solani Kuhn described the mycelial fusion group of Rhizoctonia solani AG2-1 and AG-4, belonging to the fungus Subgeronia spp. The bacterium does not produce spores, and it spreads and reproduces mainly by mycelia. The primary mycelium is colorless, followed by yellow-brown, septum, and 8-12 μm thick, and the branches are contracted at the base. The old mycelium often presents a series of barrel-shaped cells. Sclerotia are nearly spherical or amorphous, 0.1-0.5 mm, colorless or light brown to dark brown. The spores are nearly round and the size is 6-95-7 (μm). The sexual state is Thanatephorus cucumeris (Frank) Donk. Membrane is a basidiomycotina fungus.

Transmission routes and pathogenic conditions The pathogens are dormant in the soil with sclerotia or chlamydospores. In the following year, the ground temperature began to germinate at a temperature higher than 10°C and entered the saprophytic stage. Rapeseed sowing was subject to suitable conditions for disease. The pathogens directly invaded from the stomata, wounds or epidermis of the roots, causing morbidity. After the disease minister hyphae continue to expand around. There are also fruiting bodies that produce spores that scatter at night and fall into the leaves of the plants and cause lesions. In addition, the disease can spread through rain, irrigation water, fertilizers or seeds. Soil temperature 11-30 °C, soil moisture 20% -60% can infect. High temperature, continuous rainy days, lack of light, poor seedling resistance are easily infected.

Control methods (1) According to the local climate, determine the appropriate sowing date according to local conditions, not too early sowing. (2) In case of continuous high temperature for several days after sowing, it should be timely watered to reduce the temperature and control the occurrence of the disease. (3) Do not use rice sheaths with sheath blight in southern rapeseed, and do not plant rapeseed in rice fields with severe blight. (4) The application of compost produced from Japanese enzyme strains can also use pig manure compost and cultivating antagonistic bacteria Bacillus cereas for soil or seed treatment, which can effectively inhibit Rhizoctonia solani and achieve the purpose of preventing and curing blight. (5) Conditional rotation may be performed for more than 3 years. (6) Spray 70% Duckesson WP 600-800 times if necessary. The enemy is easy to photolysis, and it must be used now. Can also be sprayed with 20% methyl-rhodium phosphate EC 1200 times.

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