Loose kernel smut of sorghum

Loose kernel smut is a significant plant disease caused by the fungus Sporisorium cruentum. This pathogen is a systemic parasite that infects sorghum crops, leading to the transformation of floral organs into structures filled with fungal spores rather than healthy grains.

The primary host for this fungus is the sorghum plant (Sorghum bicolor). The life cycle of the pathogen typically begins with seed contamination or soil-borne spores. Once the seed germinates, the fungus enters the seedling tissue and grows systemically along with the plant throughout the entire growing season.

Symptoms become visible during the heading stage. The infected panicles exhibit distinctive abnormalities, often appearing as long, galls-like structures that eventually rupture to release a powdery mass of teliospores. In addition to panicle damage, affected plants may show stunted growth, leaf chlorosis, and excessive tillering.

Environmental conditions play a crucial role in disease development, particularly soil moisture and temperature during the germination phase. Temperatures between +20 °C and +28 °C are optimal for the fungus to penetrate the seedling. Environmental factors that delay germination can increase the likelihood of successful infection.

The economic impact of loose kernel smut is substantial, as it leads to the complete loss of yield in infected heads. Beyond grain loss, the presence of smut galls can contaminate the grain harvest, reducing its overall quality and commercial value for both food and livestock feed applications.

• Cultivation of resistant sorghum cultivars.
• Rigorous seed treatment with systemic fungicides.
• Crop rotation to reduce pathogen load in the soil.
• Optimizing planting times to ensure rapid and uniform seedling emergence.