Sorghum seedling blight - symptoms
When sorghum grows to 4-5 leaves, it can develop. Start with the lower leaves and expand backwards. The diseased leaves had purple streak and gradually merged, causing the leaves to gradually die from the top, and the seeds became brown.
Sorghum seedling blight - pathogen
Fusarium moniliforme Sheld. Fusarium moniliformis is a fungus known as the fungus. It grows fast on PDA medium, with yellow to brown sub-beds, airy white to light pink, with two size conidia. The large conidiophore crescents were slightly curved, tapering toward the ends, slightly blunt at the top, sharper at the other end, with 3-4 membranes, and 3-diaphragm size 22-392.5-3.5 (um). Small conidia spores globose, unit cells, colorless, oblong or spindle-shaped, size 4-30l. 5-5 (um). No thick clam spores. The sexual state is Gibberella fujikuroi (Saw.) Wr., known as Fusarium sibiricum, belonging to the fungus Ascomycotina. The optimum temperature for the development of the bacteria is 25°C, and the lethal temperature of 54°C is 6 minutes, which is strong against sunlight. Transmission pathways and onset conditions were overwintering with nosomy and chlamydial spores in sick or dead soils.
In the following year, conidia are produced and spread by rainwater splashing to invade the wound. Conidia continue to be produced on the diseased part for reinfection. In early spring and early summer, the weather is favorable for the onset of cold weather. The low incidence of water in the field, the high humidity in the field, or the application of under-mature compost will increase the incidence.
Sorghum seedling blight - control methods
(1) Three years or more of rotation is implemented. (2) Strengthen management, appropriate density, use high ridge or sorghum cultivation, do not plant sorghum in low-lying areas. (3) Apply compost that has been thoroughly decomposed organic fertilizer or Japanese enzyme bacteria, and drainage should be timely after rain, and flooding is prohibited.
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