Photo: Peter Landschoot, Penn Stateįigure 4. Circular patch of dead bentgrass with the center colonized by Chewings fescue and annual bluegrass. Photo: Peter Landschoot, Penn Stateįigure 3. Take-all patch symptoms on a creeping bentgrass tee. In rare instances, spore-producing structures called perithecia may be observed on infected crowns and leaf sheaths.įigure 2. Infected roots often show dark brown coloration of the vascular cylinder, whereas cortical tissues remain clear and intact. When examining dead or dying roots, crowns, and stem bases with a microscope, trained diagnosticians frequently observe dark brown hyphal strands (ectotrophic runner hyphae) and mats of fungal mycelium on the surface of take-all patch-affected tissues. Roots and crowns of affected plants are generally brown or black. Symptoms are most conspicuous after turf has been stressed during periods of hot, dry weather. In stands of mixed species affected by take-all patch, bentgrass is killed or injured while other grasses remain unaffected. Patches range from a few inches to over 3 feet in diameter and older patches are often slightly sunken relative to surrounding turf. Disease symptoms appear as rings, crescents, or large spots, with centers often colonized by annual bluegrass, fine fescues, or weeds. Take-all patch usually appears during late spring or summer as reddish-brown, yellow, or tan areas of dead bentgrass. Photo: Peter Landschoot, Penn State Symptoms and signs Patches of take-all patch on a colonial bentgrass fairway. ![]() Patches of dead turf are frequently colonized by resistant plant species, such as annual bluegrass, fine fescues, and broadleaf weeds.įigure 1. Because take-all patch is a root and crown disease, infected plants are usually killed, and turf is slow to recover. avenae, this disease is most often observed on relatively young (1 to 5-year-old) bentgrass turf but can occasionally damage older stands. Caused by the fungus Gaeumannomyces graminis var.
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