Sod webworm is a name homeowners use for a lawn that looks chewed. The page that sets our limit on insect damage is thin St. Augustine and chinch bugs. We see thin and chewed turf on mowing visits. We do not automatically spray, and we do not sell a webworm treatment. This site does not publish a life cycle, a bait, or a spray interval for it.
The same sunny patch can be insects, a dry zone, a scalp, or more than one of those. Webworm damage and chinch damage are not something we separate from the sidewalk. Naming the moth from the truck would be a guess. A specialist can make that call. Our call is whether the grass is still there.
What it looks like here
People describe notches, chewed blades, or patches that thin after a hot stretch. We do not treat that description as a lab result. If stolons still cross the ground, the first moves are the mowing height and the water. St. Augustine cut below 3.5 inches opens the lawn and makes every later problem look worse. Evening water that leaves the leaf wet overnight is a fungus invitation, which is a different word and still not a product we sell.
If the area is already sand, the chewing story does not put grass back. Replacement is sod, after the old mat is out and the grade is right. Sod is not a pesticide. Putting Floratam on a corner that never gets water repeats the patch. Putting it in all-day shade repeats a different failure. A photo that parts the grass down to the soil is more useful than a species guess typed into a text.
What we do about it
On the visit we flag what we see and we keep mowing the living lawn at the right height for the grass that is actually growing. We do not add a chemical line to the mowing ticket. We do not promise the next week will be green because we identified a moth. If you want a treatment, that is another company. If they clear the turf as dead, call us for the piece that has to be replaced.
Bring a daylight photo of the patch and a photo of the grass next to it. That is enough for us to say mow, wait, or replace. It is not enough for us to name the insect. Read the limit on thin St. Augustine and chinch bugs.