Take-all root rot, also known as take-all patch, is a common turfgrass disease in Louisiana caused by the soilborne fungus Gaeumannomyces graminis var. graminis, which is often abbreviated to Ggg. The initial symptoms of take-all root rot generally are visible as an overall yellowing and thinning of the turfgrass, which later turns into brown, irregular patches. Diseased roots are often short, dark in color and somewhat brittle. The overall density of the root system is also greatly reduced. Affected stolons can be easily removed from the lawn. Careful examination of stolons and the base of the leaf sheaths with a good hand lens may reveal the presence of the black strands of fungal mycelium of Ggg on their surfaces. The appearance of symptoms generally coincides with periods of several abiotic stresses, especially heat and drought stress. The disease commonly affects St. Augustine grass as well as bermudagrass.When affecting bermudagrass, the disease is often referred to as bermudagrass decline.
Initial yellowing of turf due to take-all root rot
Large, irregularly-shaped areas of turf may die and patches of bare ground appear
Root systems of affected turfgrass
Presence of the black strands of fungal mycelium on affected stolons
One way to reduce disease incidence and accelerate turfgrass recovery is to maintain a healthy lawn through balanced fertilization, irrigation and regular mowing. Some simple guidelines:
In addition to cultural practices, fungicide applications may be required to achieve effective disease control. Always check fungicide labels for site application restrictions. When selecting products, homeowners must purchase fungicides that are labelled and recommended for residential lawns. When using fungicides, always remember to follow the label rates and frequency of application. Fungicides used to manage take-all root rot are sold under various trade names. They contain these active ingredients.
|Fungicide Active Ingredients|
For information on sample collection and submission guidelines please visit the Plant Diagnostic Center.
Download here: Louisiana Home Lawn Series: Take-all Root Rot 3624-BB