Symptomatic strains were slightly dwarfed, stems were thinner, leaves were slightly narrower, subalgae slightly increased, and earings were slightly earlier than sharp panicles. Plants are often damaged flower plants, ovary filled with black powder, the fungal winter spores. Before the rupture of the diseased granules, there was a layer of white to grayish white film. After the spores matured, the membranes ruptured and the black powder was scattered. The black column appeared and was the residual tissue of the host vascular bundle.
The pathogen, Sphacelotheca cruenta (Kuhn) Potter, is known as sorghum axis turfgrass and is a basidiomycotina fungus. The phosporus heap has an off-white coat composed of mycelium. The winter spores are dark brown, spherical to ovoid, 5–10 μm in size, and the surface has a faintly visible pattern. The bacteria can germinate in water and nutrient solution. In the wort nutrient solution, a large amount of spores can be produced. Succulum can not be formed at high temperatures and in distilled water, and mycelial hyphae can be produced. The fungus has physiological differentiation or heterozonation.
Transmission routes and conditions The disease is a disease that invades systemic infection at the bud stage. Both seeds and soil can be transmitted diseases, mainly seed-borne diseases.
Winter spores attached to the seed surface can survive for 3 to 4 years under indoor conditions, and winter spores scattered in the soil can survive for 1 year, and the survival rate is about 20%. According to the test, the soil containing the chlamydospora sp. Upper sorghum, the incidence rate is very low. Chlamydospore can germinate at the temperature of 12-36°C, and the infection temperature is 20-25°C. Generally suitable for sorghum seed germination conditions, also suitable for the bacteria infection. Early sowing on the production, low soil temperature, long time from the germination to the emergence of sorghum, pathogen infection time elongated, increased the chance of infection, the incidence of heavy.
See sorghum head smut for control methods.
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