It’s in the soil. It grows from old tree or bush roots. It shows up when conditions include high temperatures combined with high humidity. Fungus is a fact of life. If you hear the word “tropics” on the news, look for your grass to start showing signs of fungus. Here’s a quick way to figure out if the weather is tropical: If the average temperature and humidity add up to 150 or more, then it’s tropical. Dew points above 65 also are considered tropical weather. Right now, when we’ve had plenty of rain and the temperatures are high, there’s a good chance fungus will appear.
There are some three-step products to treat for fungus, but no product is perfect in warding it off. If you plan to treat for fungus, start treating from the spring season on. You can hire professionals for the treatments or you can try a self-contained treatment product.
Or you can let it take over a little, and then aerate and plant some grass seed. Fescue is more resistant to fungus than bluegrass. There are lots of nice, new, thin blade grasses or fescues that mimic bluegrass. Grass seed has come a long way, so look around to see what might work best in your lawn. It’s really a good idea to mix both a fescue and bluegrass to get a lush lawn that is resistant to problems. Pay a little bit more for a good fescue seed. Grass seeds allow for a certain amount of weed seeds mixed in with the grass. You don’t want to have to kill your grass and start over again because the seed you got has a ton of weed seeds in the mix.
Mother Nature put the fungus there, so don’t get too concerned about having a fungus-free lawn. Plant the right grass, treat it if the problem really bothers you, and then let Mother Nature do the rest.