Fairy Ring and associated lawn diseases

Asked May 11, 2018, 6:49 AM EDT

Last fall I had a analysis done on my lawn and was determined that I had fairy ring. Since then I have treated my lawn accordingly using fungicides geared at controlling fairy ring. However, this spring I see these brown spots and was wondering what type of lawn disease is it? The areas seem to have moisture and not the decay dry brown spots. I have also put down insecticide as well. I am not sure what the issues are. Any suggestions on moving forward with this problem

Prince George's County Maryland brown spots lawn

1 Response

Fungicides only suppress fairy rings. They do not control them. We cannot say that that is what you are dealing with. We do not recommend chemical controls unless the pest or disease has been identified. It is difficult for homeowners to manage possible diseases with fungicides and we do not recommend it. Here is our website. https://extension.umd.edu/hgic/fairy-rings-lawns

A lawn insecticide is only recommended if you have a grub problem and they are feeding on your turfgrass roots. Make sure you have a grub problem.
Reasons to apply a grub control include - a past history of grubs, if you have a sprinkler system that keeps the soil moist for egg laying, and if we have weather conditions like wet summers and lush lawns while the adult beetles are active in June. See our publication on japanese beetles for more information
http://extension.umd.edu/sites/default/files/_images/programs/hgic/Publications/HG78%20Japanese%20Be...

We do not have enough information how the turf has been managed. Turf type tall fescue is the recommended grass species and grows best in full sun to part shade. If you planted a contractors mix of different species at some point, some of the grasses may be dying out such as annual bluegrass, perennial, or annual rye grass. Also, Some grass species can go dormant at different rates during hot, dry weather. You may also be dealing with close mowing, poor soils, etc. See our website for cultural and environmental issues http://extension.umd.edu/hgic/cultural-environmental-problems-lawns

If you have not had your soil tested within the last several years, it is recommended. Results give pH, liming, and nutrient deficiencies. See our soil testing information http://extension.umd.edu/hgic/soils/soil-testing

You can rake the dead areas up and reseed now. See our website on lawn care https://extension.umd.edu/hgic/plants/lawns


mh