There's no gray leaf spots. I don't like the fact it has those brown tips.
I think I may have called this disease TARR. YAY A NEW ONE.
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Nigrospora Stolon Rot
Richard L. Duble, Turfgrass Specialist
Texas Cooperative Extension Text and images copyright © Richard Duble.
A relatively new disease of St. Augustinegrass, Nigrospora stolon rot, has resulted in serious deterioration of St. Augustinegrass. The disease appears to girdle the stolon (stem or runner) of St. Augustinegrass and deprive the stolon of water and nutrients. Leaves and stolons appear to be under severe moisture stress and soon become totally desiccated.
The disease has been especially severe during dry spring and summer months. High temperatures and drought conditions favor development of stolon rot in St. Augustinegrass. Symptoms of the disease include dark brown lesions on stolons. As conditions favor the fungus, the lesions enlarge and eventually girdle the stolon. The girdling of the stolon stops the movement of water and nutrients to the leaves. The leaves soon wilt, turn yellow and die. New growth on the terminal end of diseased stolons is typically thin and yellow reflecting a limited supply of nutrients to the growing point. Overall symptoms are similar to those caused by chinch bugs on St. Augustinegrass.
Laboratory observations of stolons from diseased areas may show the presence of Nigrospora as well as Curvularia. Both fungal organisms are weak pathogens and usually only attack plants under stress. Environmental conditions such as unusually low winter temperatures, extreme drought and extremely high temperatures during spring and summer contribute to the occurrence of stolon rot. Providing adequate moisture, raising the mowing height and two applications of Daconil 2787 at 8 oz. per 1,000 sq. ft. at 14- to 21-day intervals has provided good control of the disease. Looking for the official turfgrass site? Click here
I'm sticking with the original rec. Some kind of fungicide.
I'm getting wilder about trying out stuff. I wouldn't be opposed to trying the woo woo recipes of Listerine. The risk on getting wild is there's a chance it could be too strong for the plants.
I guess I should mention that if you do feel you have nuked something with too much juice the remedial treatment is carbon. Same principle as charcoal slurry or pills for us and the critters.
Consan 20 is another old school one. You can get it off the shelf at some hardware or nurseries. It's a soap. I think it's 2tsp per gallon. A pint lasts for a long while