Large Patch Brown Patch

Large Patch Brown Patch

Identification

A soft, dark rot occurs at the base of the leaf and leaves can easily be pulled off the stem. The base of a pulled leaf has a rotted odor. Roots are not affected by this pathogen.

Environment

This disease is most likely to be observed from November through May when temperatures are below 80F. It is normally not observed in the summer months. Infection is triggered by rainfall, excessive irrigation, or extended periods of high humidity resulting in the leaves being continuously wet for 48 hours or more.

Threats

Zoysia Grass St. Augustine Grass Warm-season turfgrasses

Treatment

Fungicides to treat and prevent spreading. Fertilization to encourage new growth and simulate recovery. Preventative fungicides applied to turf that have routine problems.