Grubs are the larvae of beetles that live in your soil and feed on grass roots, causing brown patches, dead spots, and lawn damage that can appear seemingly overnight. In Oklahoma, grub damage typically shows up in late summer and early fall. Prevention is far more effective than treatment; apply grub preventive products in late spring to early summer before grubs hatch and start feeding. If you already have damage, you’ll need both grub control AND lawn repair.
Here’s the frustrating thing about grubs: by the time you see the damage, the worst has already happened. Those white, C-shaped larvae have been quietly munching on your grass roots for weeks. At Complete Lawn Care, we’ve seen too many Tulsa homeowners discover grub problems too late. Let’s make sure that doesn’t happen to you.
What Exactly Are Grubs?
Grubs are the larval (baby) stage of various beetles, including June bugs, Japanese beetles, and masked chafers. Adult beetles lay eggs in your lawn during summer. When those eggs hatch, the larvae (grubs) burrow into the soil and start eating grass roots.
What do they look like? White or cream-colored, about the size of your fingertip, with a brown head and six small legs near the head. They curl into a C-shape when disturbed. If you dig in a brown patch and find these guys, you’ve confirmed your grub problem.
Here’s the irony: grubs actually prefer healthy, well-watered lawns. That beautiful green grass you’ve been maintaining? It’s prime real estate for beetle egg-laying. Being a good lawn owner doesn’t prevent grubs; it just means you have more to lose.
What Damage Do Grubs Cause?
Grubs eat grass roots. Without roots, your grass can’t absorb water or nutrients, so it wilts, turns brown, and dies. But the damage goes beyond just dead grass:
• Dead patches that expand over time as grubs feed and grow
• Grass that rolls up like carpet because there are no roots holding it down
• Secondary damage from animals (raccoons, skunks, armadillos, birds) digging up your lawn to eat the grubs
• Weakened turf that’s more susceptible to disease and weeds
• Expensive repair costs if damage is severe enough to require re-sodding
That secondary animal damage is often what homeowners notice first. You wake up to find your lawn torn apart, with chunks of turf scattered everywhere. The animals are just hunting grubs, but they destroy your lawn in the process. It’s adding insult to injury.
How Do You Know If You Have Grubs?
Warning signs to watch for:
• Brown patches appearing in late summer or early fall that don’t respond to watering
• Grass that feels spongy or loose underfoot
• Turf that rolls back easily when you pull on it (the roots are gone)
• Increased bird activity on your lawn (they’re hunting grubs)
• Animal digging, especially at night (skunks, raccoons, and armadillos love grubs)
• Patches that look drought-stressed even though you’re watering properly
The tug test: Grab a handful of grass at the edge of a brown area and tug. If it pulls up easily with no resistance, like lifting a piece of carpet, you likely have grubs. Healthy grass with intact roots won’t come up without a fight.
The dig test: Cut a 1-square-foot section of turf about 3 inches deep and peel it back. Count the grubs you see. More than 5-10 grubs per square foot indicates a problem that needs treatment. A few grubs are normal and won’t cause visible damage.
When Should You Treat for Grubs?
This is the most important thing to understand: PREVENTION is far more effective than treatment. Here’s the Oklahoma grub timeline:
Late Spring to Early Summer (May-June): Apply preventive grub control. Products containing imidacloprid, chlorantraniliprole, or similar active ingredients create a barrier in your soil that kills grubs as they hatch. This is the ideal window. The grubs haven’t hatched yet, so you’re stopping the problem before it starts.
Summer (June-July): Adult beetles are flying around, mating, and laying eggs in your lawn. You’ll see June bugs bumping into your porch lights. Eggs are hatching, and tiny grubs begin feeding.
Late Summer to Early Fall (August-September): Grubs are now larger and feeding heavily. This is when damage becomes visible. If you missed preventive treatment, curative products (like those containing trichlorfon or carbaryl) can kill existing grubs, but they’re less effective than prevention, and you’ll still need to repair the damage.
Fall to Winter: Grubs burrow deeper as soil cools, becoming harder to reach with treatments. They’ll overwinter in your soil and resume feeding briefly in spring before becoming adult beetles and starting the cycle again.
Complete Lawn Care’s program includes properly timed grub prevention so you don’t have to remember this timeline yourself. We apply preventive treatments during the optimal window for Oklahoma conditions.
What’s the Best Grub Killer for Oklahoma Lawns?
For prevention (applied before grubs hatch):
Products containing imidacloprid, clothianidin, or chlorantraniliprole work well when applied in late spring to early summer. These create a barrier in the soil that kills young grubs as they hatch and begin feeding. Professional-grade products used by Complete Lawn Care typically provide more consistent results than consumer products.
For treatment (killing existing grubs):
If you already have grub damage, products containing trichlorfon or carbaryl work faster but have a shorter residual effect. These are best applied in late summer when grubs are actively feeding near the surface. Water the product in immediately after application.
Important: All grub control products need to be watered into the soil to reach the grubs. Apply before rain or water in with at least 1/2 inch of irrigation immediately after application. Product sitting on dry grass won’t reach the grubs below.
How to Repair Grub Damage
If grubs have already damaged your lawn, you’ll need to both eliminate the grubs AND repair the turf. Here’s the process:
1. Confirm grubs are the problem using the tug test and dig test described above. Don’t assume grubs. Other issues (disease, drought, dog urine) can cause similar symptoms.
2. Apply curative grub treatment and water it in thoroughly. You need to kill the grubs before repairing the lawn, or they’ll just destroy the new grass too.
3. Wait 1-2 weeks to confirm the treatment worked. Check for live grubs by digging again.
4. Repair the lawn. For small areas, rake out dead grass and overseed (Fescue) or let Bermuda spread naturally with proper care. For large areas, sodding may be faster and more practical.
5. Apply preventive treatment next year to avoid repeating this expensive cycle.
Don’t Let Grubs Destroy Your Lawn
Complete Lawn Care’s 7-step program includes properly timed grub prevention so you’re protected before problems start. We apply professional-grade products during the optimal window for Oklahoma’s grub lifecycle, taking the guesswork out of timing.
Already seeing damage? Contact us for an assessment. We can confirm whether grubs are the cause and recommend the right treatment and repair approach for your specific situation.
Call: (918) 605-4646
Email: [email protected]
Online: completelawncaretulsa.com/get-a-quote
Serving Tulsa, Broken Arrow, Bixby, Jenks, Owasso, Sand Springs, and surrounding communities.