Sedge smut

Pathogen and disease type. The pathogen responsible for this disease is Anthracoidea capillaris, a basidiomycetous fungus classified within the smut fungi. It acts as a biotrophic parasite, specializing in infecting the reproductive organs of its host. The disease is characterized by the systemic colonization of the sedge inflorescence, where the fungus eventually replaces healthy tissue with a mass of teliospores.

Affected crops. The disease primarily affects plants belonging to the Carex genus, specifically those within the Carex capillaris group. While not a primary pathogen of major row crops, it significantly impacts biodiversity and productivity in natural grasslands and pastures where sedges serve as a major component of the forage ecosystem.

Symptoms and signs. The infection becomes visible during the heading stage of the host plant. Instead of healthy utricles, infected plants develop darkened, swollen structures filled with the soot-like spores of the fungus. As the disease progresses, these structures rupture, releasing masses of spores into the environment, which facilitates further dissemination by wind and rain.

Development and spread conditions. The life cycle of Anthracoidea capillaris is highly dependent on meteorological conditions, favoring periods of high humidity and moderate temperatures during the host's flowering phase. The teliospores are highly resilient and can persist in the soil or on dormant plant tissue, serving as a primary inoculum source for subsequent seasons.

Protection and prevention measures. Managing sedge smut relies heavily on integrated preventive techniques, as chemical control is rarely economical in natural habitats. Essential practices include:

• Timely mowing of meadows before the spore-releasing phase.
• Cultural practices that promote vigorous plant growth.
• Removal and proper disposal of heavily infected plant clusters.
• Monitoring natural plant populations to prevent the spread of the pathogen to managed areas.