Eragrostis smut

The disease is caused by the fungus Tilletia eragrostidis, a member of the Basidiomycota phylum. This pathogen is a specialized agent that specifically targets plants within the Eragrostis genus, commonly known as lovegrass, impacting their reproductive structures during the plant's life cycle.

In affected crops, the fungus disrupts the development of the inflorescence. Instead of producing fertile seeds, the plant tissues are colonized by the fungal mycelium, which eventually transforms the spikelets into masses of black, powdery teliospores, effectively causing sterility in the infected grass stems.

The symptoms become apparent during the heading stage of the plants. The infected panicles appear distorted and blackened. When the protective glumes are ruptured, the internal mass of spores is exposed, which can then be easily dispersed by wind, water splashes, or harvesting machinery to neighboring healthy plants.

Disease progression is heavily influenced by environmental conditions, particularly moisture levels during the flowering period. The spores can remain dormant in the soil or adhere to the surface of seeds, waiting for the right conditions to germinate and infect the next generation of host plants.

Managing Tilletia eragrostidis requires a combination of agricultural best practices. Key prevention strategies include the selection of certified disease-free seeds and the treatment of seeds with appropriate fungicides before planting. Additionally, practicing proper crop rotation helps reduce the accumulation of fungal spores in the soil, minimizing the risk of infection for future seasons.