What is take-all root rot?

Take-all root rot is a soil-borne fungal disease that attacks the root system and rhizomes of turfgrass. The pathogen, Gaeumannomyces graminis, causes roots to rot and prevents water and nutrient uptake, leading to visible decline above ground. In Texas, this disease most commonly affects St. Augustine grass, which dominates residential and commercial lawns across the state.

Affected areas show circular to irregular patches of yellowing or light-colored grass that thin out and may die. Symptoms often appear in late spring or early summer as soils warm. Homeowners may notice the damage spreading slowly across the lawn, with affected grass pulling up easily from the soil because the root system has deteriorated.

The disease thrives in warm, moist soils and is favored by poor drainage, compacted soil, and high nitrogen fertilization. Acidic soils with pH below 6.5 tend to support fungal activity more readily. Extended wet conditions from rain or overwatering increase pressure. The fungus persists in soil and plant debris, making it difficult to eliminate once established.

Prevention and management focus on cultural practices: improving drainage, reducing thatch, avoiding excessive fertilizer, and maintaining proper irrigation. Affected lawns may require aeration and soil amendment to restore health. Professional lawn care services can identify the disease early and recommend targeted management strategies.