How to Control Lawn Grubs
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My name’s Stuart, I’m an associate with the Scotts company, I'm a research scientist in R&D and today I’m going to talk to you about controlling grubs. So, when you’re talking about controlling grubs, it’s important to understand something about the life cycle. The grubs that cause damage in turf grass come from beetles, so I’m standing in the vegetable garden here where we have Japanese beetles that are feeding on eggplant. They’re feeding and mating and they will go back to the turf grass and lay eggs. So, to control these, you need to have a product like GrubEx® down in the spring so that the insecticide is in the soil, ready to control the grubs when they are very, very small. Like a lot of insecticides, GrubEx® does not control the grubs in the fall when you see damage, you have control them with a preventative application. So, the damage that the grubs cause is visible in the late summer and in the fall, especially when conditions are dry. Because what the grubs are doing is they are eating roots, if there's a lot of moisture the turf grass will look like it’s fine because there’s enough moisture there for the roots. But, if it’s dry and later in the year when more of the roots are being consumed, the turf will die, turn brown and you can pull it up in sheets and underneath you’ll find the grubs. Thanks watching and if you have any questions, leave them below. For more information, go to Scotts.com. I’m Stuart and I’m Scotts Miracle-Gro.
If you’ve had problems in early summer with beetles, and by late summer dead patches of grass have appeared in your lawn, you probably have grubs. Grubs are the larvae of Japanese beetles, June beetles, chafers, and others. These white, C-shaped grubs feast on organic matter in the soil, including grass roots.
Signs of Grub Problems
There are several easy-to-spot signs that you may have grubs in your lawn:
- Raccoons, skunks, armadillos, or birds are digging up your yard. These animals all love to dine
on large, mature grubs.
- You can pull back the dead patches on your lawn like pieces of loose carpet. This happens
because grubs eat the roots holding the turf firmly in place on the soil.
- Before the dead patches even appear, your lawn feels spongy when stepped on, as it it were freshly laid sod.
To check if you have a grub problem, peel back a square foot of green turf in each of several areas of your lawn. If you see 6 or more grubs in each area, it may be time for action.
Controlling Grubs in the Lawn
Beetles, like Japanese and chafer beetles, emerge in early summer, feed on plants in the garden, and lay their eggs in the soil in the lawn. Later in the summer, the grubs hatch and immediately begin to feed. They will continue to eat and grow until mid-fall, when they move deeper in the soil so they can survive through the winter. When the soil warms up again in the spring, the large, mature grubs move back into the upper soil levels, where they transform into adult beetles that emerge in early summer and start the whole process over again.
The key to controlling grubs is to kill them before they hatch and begin to cause damage to your lawn. In spring or early summer, apply a preventative grub control product, such as Scotts® GrubEx®1 to your lawn, following label directions. This is especially important if you’ve had problems with grubs in the past. One application of Scotts® GrubEx®1 can kill and prevent grubs for up to 4 months.
Prevention & Maintenance Tips
- Applying a preventative grub control product in the spring or early summer will provide much better grub control than waiting until after the damage has occurred.
- Use a spreader to apply Scotts® GrubEx®1. Be sure to follow application directions.
- To activate the product, water immediately after applying.
- A drought-stressed, underfed lawn will show grub damage faster, and with fewer grubs per
square foot, than a properly-fed, well-maintained lawn.
- A properly maintained lawn can tolerate more grubs per square foot than a stressed lawn.
- Repair dead patches caused by grubs with Scotts® EZ Seed®.