A lawn can be green on Friday and half gone by Monday. People don’t believe that until it happens to them, and then they’re standing in the yard on a Tuesday morning trying to figure out who poisoned the grass.
Nobody poisoned it. Late summer is when a couple of pests get busy on Charlotte fescue, and at least one of them works fast enough to ruin a weekend.
The annoying thing is how little warning you get. By August everybody’s lawn looks a little beat up from the heat, so when a patch starts to thin or go off-color, the natural assumption is more of the same. You water it. You wait for fall. Meanwhile something is eating the lawn and you’ve handed it a head start.
So late summer is the season to look a little closer at the rough spots instead of writing them all off.
The damage you can’t see until it’s done
Grubs are the slow version. They’re beetle larvae, fat little white things curled up like the letter C, living a few inches down where you’ll never run across them by accident. All through late summer and into fall they sit there eating grass roots.
That’s what makes them such a problem. The top of the lawn looks alright for a good while because the plant is running on what it already had, and underneath, the roots are quietly getting chewed off. By the time the grass actually browns, the worst of it has happened.
When it does show, it shows as brown patches that won’t green back up no matter how much you water, and the grass in them lifts right off the dirt. That’s the giveaway. Grab a handful at the edge of a dead spot and pull. If it peels back like old carpet with nothing holding it down, you’ve got grubs, because the roots that used to anchor it are gone.
There’s an earlier sign too, and it fools almost everybody. Skunks and raccoons and birds dig grubs up to eat them. So when something’s been tearing little holes in the yard overnight, the animals didn’t wreck your lawn. They found out about the grubs before you did. Most people spend a week being furious at the raccoons.
If you want to be sure, slice out a square foot of turf and fold it back like a flap. One or two grubs under there is just life, nothing to spray for. Six, eight, a dozen, that’s a lawn that’s going to keep thinning into fall and come back worse next year.
Armyworms don’t give you a week
Armyworms are the other one, and they’re nothing like grubs except for the part where they eat your grass.
They aren’t worms at all. They’re caterpillars, the larvae of a moth, and instead of working the roots they go after the blades up top. What makes them so bad is that there are so many of them and they move together. One moth drops hundreds of eggs, the eggs hatch around the same time, and the whole crowd of caterpillars crawls across the lawn eating everything as it goes. That’s the name. They march through like an army.
A heavy infestation can take a healthy lawn down to brown stubble in two or three days. Two or three days. People leave for a long weekend and come home to a yard that looks like it was scalped with a mower set too low, and the first thought is always chemical, something in a fertilizer bag or the irrigation, when it was really just a few thousand mouths that all showed up at once.
If you catch them early the sign is faint. The lawn looks a little ragged, the tips chewed, almost like a bad haircut. Birds hammering one area is worth noticing, same as with grubs. And they feed in the cool of the morning and around dusk, so if you get down and part the grass at the right time of day you can usually see them near the soil line, an inch or so long, green going to brown, a stripe down the side.
Here’s what nobody tells you about armyworms, though. You can’t really prevent them. They blow in. Some years Charlotte hardly gets any and some years they’re all over the place, and it rides on weather coming up from the south that no one sees coming. You can run a perfect lawn and still get hit because a storm carried the moths in. So the job isn’t prevention, it’s catching them in time and not dragging your feet once you do.
Spraying the wrong week is the same as not spraying
With both of these, when you treat matters more than what you treat with, and that catches a lot of people off guard.
Grub products do their work when the grubs are young and feeding up near the surface, which is the back half of summer. If you wait until the brown patches are staring at you, you’re usually treating big old grubs that are nearly finished anyway. You’ll kill them, sure, but the lawn’s already torn up and you spent the money a month too late. The treatment still pays off for next year. It just won’t save what you’re looking at.
Armyworms are the same idea crammed into a few days instead of a few weeks. Once you know they’re there, it has to happen now. The weekend you spend reading reviews and comparing products is the weekend they finish the lawn. This is the rare situation where moving slow actually costs you the whole yard.
And then there’s the stuff people buy off the shelf, which is its own headache. Half the time it’s the wrong product for the pest, or it’s the right product put down at the wrong time, or it’s a grub product that never got watered in the way it has to be to reach the grubs. Folks spread it, feel like they took care of it, and the lawn keeps going downhill because nothing ever got where it needed to go. That last part, the watering-in, trips up more people than the product choice does.
What to do in August
Not every tired-looking patch in August is a pest. A lot of it really is just heat, and fescue dulls down in the worst of the summer and bounces back on its own once things cool off. So don’t go pulling up the whole lawn looking for caterpillars.
But when a spot looks off, give it a second look before you blame the weather. Tug the edge and see if it lifts. Notice whether the wildlife has been digging. Get down at dusk and check the soil line. It takes about a minute, and a minute of looking in August is what stands between a quick treatment and reseeding half the yard in October.
Honestly, this is the kind of thing that’s easy to stay ahead of when somebody’s watching for it and hard to stay ahead of when you’re not. A managed lawn program means grub control going down on schedule, before the damage, and somebody who knows what armyworm chew looks like the first week it appears instead of the third. On your own it’s a guessing game with a short clock.
If your lawn has thin or browning spots that don’t quite read as ordinary heat, or you’d just rather have someone keeping watch before the pests get going, keep Hyatt Landscaping in mind. Hyatt is a family-owned Charlotte area company that’s spent decades keeping local lawns ahead of exactly this kind of trouble. You can read more at hyattlandscaping.com, or look at the grub control and armyworm control pages to see how it works.