Nematodes (turf-parasitic)

What it looks like

Irregular, diffuse patches of yellowing, thinning, or wilting grass that can look a lot like drought or a nutrient problem. It tends to be worse in sandy soil and won't improve with extra water or fertilizer. Because the above-ground symptoms mimic so many other issues, you really can't tell it's nematodes just by looking — a soil sample sent to a lab is the only way to confirm.

Often mistaken for: Drought stress, nutrient deficiency, or other root/soil issues

When it shows up in the Triangle

Symptoms show up worst during the heat and dry stretches of summer, especially in sandy soils. Late summer is the best time to pull a soil sample for the most accurate count.

Where you’ll see it

Affects home lawns of bermudagrass, St. Augustinegrass, zoysiagrass, and tall fescue, particularly in sandy soil.

What you can do

• Keep up with regular watering and fertility to help the lawn tolerate the damage (this won't get rid of nematodes, just ease symptoms)
• Avoid mowing too short and reduce foot traffic to limit added stress
• Get a soil sample tested through a lab before assuming nematodes are the cause
• Don't treat based on symptoms alone since several other problems look identical