Last week, we checked into some centipedegrass sod that was showing some odd symptoms. The patches of dying grass were shaped irregular and could see obvious wilting signs on the boarder. We checked for disease under the microscope and did find some however, with these symptoms, we decided to check nematodes. Here is the report below:
UGA Extension Pathologist, Dr. Alfredo Martinez, said centipedegrass can easily be colonized by nematodes compared to other species. The report showed both Ring and Sting nematodes being above thresholds. UGA Extension Turf Agronomist Dr. Clint Waltz says at this stage it would be best to increase irrigation and fertility. When ready, harvest this grass then consider a nematode treatment prior to reestablishment.
Also, the soil test showed pH to be 4.9. Centipedegrass can take a lower pH than bermudagrass, but below 5.5 is pushing it. Research shows a pH of closer to 6.0 is better for centipede establishment. The liming will raise the pH and take effect next year. This will help increase overall fertility. Dr. Martinez also suggested using an all purpose systemic fungicides (fungicides containing thiophanate methyl, propiconazole or an strobilurin). This might help to control any facultative pathogen/saprophyte that might be lingering.