Take-all Root Rot first shows as areas of yellowed grass in May and June. If this disease progresses, it kills the stolon’s and produces patches of dead grass during summer. This fungus causes a severe root rot that destroys the roots of St. Augustine grass. Eventually, the roots become completely rotted and non-functional. The stolons often can be lifted easily from the soil because of the poor root system.
To prevent take all root rot, the best approach is to take proper care of your grass. Encourage healthy root development by watering deeply and infrequently. Reduce thatch. Too much nitrogen will make your turfgrass vulnerable to disease. Use a slow release 3-1-2 fertilizer. In May or June use a top dressing of sphagnum peat moss which will suppress the fungus.
If you suspect you have TARR, you can bring a sample of the grass to our extension center at 9020 Airport Road in Conroe. We can examine the sample under the microscope.
Once the root rot has infested your lawn, apply a fungicide for turf. More specific information can be found here ( Take-all Root Rot ).