Eliminate and Prevent Armyworms, Grubs and Billbugs in Your Lawn

Armyworms, white grubs and billbugs are among the worst pests to have in your residential or commercial lawn. The damage they cause is often difficult to diagnose and can take several months to recover from. In this article, you’ll learn how to prevent and eliminate lawn-damaging insects in your lawn while posing less risk to the environment.

Army worm lawn damage


These lawn-damaging insects attack grass roots resulting in brown dry spots that don't seem to get better regardless of how much water or fertilizer you throw at them. Depending how long it takes to diagnose the problem, it could be several months before your lawn recovers. This short video shows an active armyworm infestation in a lawn.


If you've been following our content for a while, you know we often mention a product called Caravan G. It’s a combination insecticide and fungicide that's effective for both use cases. But what about situations where you need an insecticide that's effective against armyworms, or you're concerned about negatively impacting insects and invertebrates that we value such as bees and earthworms? Enter Acelepryn. Acelepryn is a selective insecticide that targets common lawn pests like white grubs, annual bluegrass weevils, various turf caterpillars, billbugs, and more. It is one of the best insecticides to eliminate and prevent armyworms in your lawn.

Acelepryn G Bag

A single application provides season long coverage on both warm and cool season lawns. The active ingredient in Acelepryn is called chlorantraniliprole. It is very effective for eliminating harmful insects while not targeting bees and other pollinators.

If you're interested in learning more about chlorantraniliprole, here’s a research paper by the International Society of Arboriculture that explains how the active ingredient functions in detail. It also discusses the environmental benefits that chlorantraniliprole has over other insecticides. Acelepryn is available in both liquid and granular forms. Both are equally effective with the granular being easier to apply. For this reason, we’ll focus on the granular version called Acelepryn G. If liquid insecticide is more your preference, Acelepryn SC 4 oz. is also available.

Pouring Acelepryn G into Spreader

As far as application rates, Acelepryn G can be applied at rates ranging from 1.15 pounds per 1,000 square feet to 2.3 pounds per 1,000 square feet. What this means is a single 25-pound bag will cover lawns between 11,000 square feet to 21,000 square feet.

So, the question you’re probably asking yourself is “which rate should I use?” Well, the short answer is it depends on which lawn pest you're targeting. That said, if you want a single rate that's effective against white grubs, armyworms, annual bluegrass weevils, and billbugs, we recommend applying Acelepryn G at a rate of 1.8 pounds per 1,000 square feet. This rate provides great control while covering lawns up to 14,000 square feet.

For the broadest insect control, the best times of the year to apply Acelepryn G are the months of April and May. Though April and May are ideal, the product can also be applied successfully as late as September. For additional application options, consult the Acelepryn product label.

A great benefit of choosing the granular version of Acelepryn is the only tool required for application is a broadcast spreader. 

Our spreader of choice is the EarthWay 2050p. When configured with a setting of 12, you’ll get coverage up to 12,000 square feet. If you're not using an EarthWay, check the Acelepryn G product description for common spreader settings.

As with any granular product, lightly overlap passes to ensure even coverage.

Acelepryn G Application with Broadcast Spreader

As far as recommended personal protective equipment (PPE), the Acelepryn G product label recommends wearing a long sleeve shirt, long pants and shoes with socks.

Long Pants and Boots PPE

Out of an abundance of caution, it’s also good to wear protective gloves and eyewear whenever applying insecticides to your lawn.

Upper Body Personal Protective Equipment Once finished, be sure to sweep or blow any excess product that gets on driveways and sidewalks back into the lawn. Also take this time to thoroughly clean your spreader.

Rinsing Broadcast Spreader If you're interested in trying out Acelepryn G, you can pick it up here at the Golf Course Lawn Store. The product description also contains a video that provides even more detail than this article.

We wish you an insect-free lawn 😎

Golf Course Lawn