Effective Grubworm and Armyworm Control in Austin Lawns: Why We Choose Acelepryn

Understanding Grubworms and Armyworms in Central Texas Lawns

A white grub (scarab beetle larva) curled in soil. White grubs feed on grassroots and can cause dead patches in lawns.

Grubworms (white grubs) are the subterranean, C-shaped larvae of scarab beetles (like June beetles and Japanese beetles) that voraciously feed on turfgrass roots. When large numbers of grubs chew off the roots just below the soil surface, grass can wilt, turn brown, and lift up easily “like a loose carpet” due to the root damage. Grub damage often becomes evident in late summer or early fall, when the nearly full-grown larvae cause expansive dead patches in lawns. In the Austin area (including Bee Cave and Georgetown), grub infestations typically result from eggs laid in mid-summer that hatch into hungry larvae by late July or August. Lawns with a history of grub problems are especially at risk each year if preventative measures are not taken.

A fall armyworm caterpillar feeding on turfgrass blades. Armyworms are surface feeders that can defoliate lawns rapidly.

Armyworms, by contrast, are above-ground caterpillar pests (the larvae of moths) that chew on grass blades. The fall armyworm (Spodoptera frugiperda), in particular, is a notorious late-summer pest in Texas lawns. These striped, brownish caterpillars feed aggressively on grass foliage, often moving across yards in large “armies” and devouring entire patches of turf overnightturffiles.ncsu.eduturffiles.ncsu.edu. Fall armyworm damage appears as scorched brown areas of turf, sometimes with a distinct line between eaten and untouched grass. Armyworms don’t eat roots like grubs do – instead, they skeletonize and consume the leaves, which can ruin a lawn’s appearance almost instantly. Because Austin’s warm climate allows multiple generations of armyworms (especially after mild winters), late summer and early fall often bring outbreaks of these pests in our region.

Both grubworms and armyworms are significant lawn destroyers in Central Texas. An effective lawn care program in Austin must control both types of pests to prevent ugly damage. At Century Outdoor Services, we approach this challenge with an integrated strategy and carefully chosen products that protect your lawn while also safeguarding the environment. Below, we explain which grub control products we use and why, highlighting how our agronomic expertise led us to favor Acelepryn for grubworm (and caterpillar) control over other options.

The Downside of Traditional Grub Control Products (Dylox and Others)

Homeowners facing a grub infestation often turn to traditional insecticides like Dylox (active ingredient: trichlorfon). Dylox is a fast-acting, curative grub killer that has been used for years. Does Dylox work? Yes – it can kill exposed grubs within a day or two of application under ideal conditions. In fact, Dylox is sometimes marketed as a “24-hour grub control” solution. However, as professional agronomists, we recognize several drawbacks with Dylox and similar older insecticides that make them less desirable for routine lawn care in Austin:

• Harsh on the Environment and Beneficial Insects: Dylox (trichlorfon) is an organophosphate insecticide and a cholinesterase inhibitor, which means it’s inherently more toxic. It can harm non-target organisms. For example, trichlorfon-based products carry a “Caution” signal word due to hazards (e.g. harmful if swallowed, eye irritant). Such chemicals can reduce populations of beneficial insects and organisms in your yard. By contrast, modern chemistry like Acelepryn is designed to spare beneficial arthropods (like ladybugs, lacewings, and predatory mites) and has no known adverse effects on bees or earthworms.
• Immediate Watering Requirement: Products like Dylox must be watered in immediately and thoroughly after application to be effective and to reduce risk to people and wildlife. The granules need to penetrate into the soil where grubs reside, and leaving them on the surface is unsafe for birds, pets, and can even degrade the product quickly. In fact, Dylox is ineffective unless watered in the same day – the manufacturer explicitly notes the product will not work properly without prompt irrigation. With Central Texas’s frequent watering restrictions and busy homeowners, it’s not always feasible to water the lawn heavily right after a treatment. This creates a risk that the chemical sits on the grass, potentially affecting non-target insects or animals, until it finally rains or is watered-in. (For safety, no one should walk on a Dylox-treated lawn until after watering and the grass has dried.)
• Short Residual and Narrow Window: Trichlorfon (Dylox) works quickly but breaks down rapidly, providing only a short period of control in the soil. It’s considered a “rescue” treatment for active grubs, not a season-long solution. It only kills the grubs present at the time of application and remains active for perhaps a week or two at most. There’s little to no ongoing protection against new grubs that might hatch later. Other older curative insecticides like carbaryl (Sevin) share these limitations – they are short-lived and not as effective as preventive treatments in reducing grub populations long-term.
• Higher Toxicity Category: From an applicator and homeowner safety standpoint, products like Dylox necessitate more precautions. The label carries a CAUTION warning and recommends PPE (gloves, etc.) during application. One has to be mindful of children or pets contacting the treated area before it’s watered-in and dried. We also consider wildlife – for instance, many birds feed on insects in lawns; ingesting pesticide-laden grubs or granules could harm them. In short, these older chemicals are not as gentle on the ecosystem surrounding your home.

Given these issues, our team sought out a better approach – one that would effectively control grubworms (and other pests) while minimizing environmental impact and safety concerns. This search led us to a modern solution: Acelepryn.

Why We Use Acelepryn: A Better, Safer Insecticide for Grub Control

When it comes to grubworm control in lawns, Acelepryn® has become our go-to choice at Century Outdoor Services. Acelepryn (active ingredient chlorantraniliprole) is a newer generation insecticide that provides outstanding efficacy against grubs and is notably safer for people, pets, and beneficial creatures than traditional products. Here’s why an agronomist would recommend Acelepryn for your lawn:

• Unmatched Season-Long Control: Acelepryn delivers excellent, season-long grub control with a single application in late spring. One treatment in April or May can protect your lawn all the way through the grub season. Unlike older products that might need reapplication or only tackle current larvae, Acelepryn applied preventatively will kill grubs as they hatch in mid-summer before they can cause damage. This preventive approach means your lawn’s roots are guarded proactively, rather than scrambling to curatively kill grubs after they’ve already torn up your turf.
• Broad Spectrum – Grubs and Caterpillars: Acelepryn doesn’t just stop grubs. The same application that targets grubs will also control turf-feeding caterpillars like sod webworms, cutworms, and fall armyworms. This is a huge bonus for Austin lawns, where armyworm outbreaks can coincide with late summer months. By using Acelepryn, we essentially get a two-in-one protection – your lawn’s roots are safe from grubs, and the grass blades are protected from foliar-feeding worms. In technical terms, Acelepryn is a systemic insecticide that is absorbed into the grass plant, so any armyworm that tries to chew your lawn later in the season will ingest the toxin and be controlled. Many customers who had an Acelepryn preventative treatment in spring sailed through the fall armyworm season unharmed, whereas neighbors without it suffered caterpillar damage. This broad-spectrum efficacy is one reason we stick to Acelepryn and rarely deviate.
• Reduced Risk Chemistry – Safe for Bees and Beneficials: Chlorantraniliprole (Acelepryn) was registered under the EPA’s Reduced Risk Pesticide Program due to its very low toxicity to humans and non-target wildlifeoregon.gov. It’s a remarkable product in that the EPA does not even require a signal word (Warning/Caution) on its label, because it passed all the acute toxicity tests with such favorable resultsoregon.gov. In practical terms, this means Acelepryn is extremely low in toxicity to people, pets, and mammals when used as directed. It also has no known adverse effects on beneficial organisms like earthworms and honeybees. University research confirms that even if bees forage on flowering weeds in Acelepryn-treated turf, there is no harm – chlorantraniliprole is safe for bees even when clover blossoms in the lawn are treated. Additionally, Acelepryn is recommended in integrated pest management (IPM) programs because it does not significantly impact natural predator insects or parasitoids that help keep pests in check. This selectivity is a big deal – we can control the target pests without disrupting the broader ecosystem in your yard.
• Lower Environmental Impact: Acelepryn’s chemistry is much more environmentally friendly for our local ecosystem. It’s not prone to leaching or runoff in the way some older insecticides are, and it has minimal impact on birds, fish, and other wildlifeoregon.gov. In fact, the Oregon Department of Agriculture noted that chlorantraniliprole has “low impact on human health and on the health of non-target organisms (e.g., birds, fish, plants)”, which is why it’s categorized as reduced-risk on turforegon.gov. As stewards of our customers’ landscapes, we feel better using a product that controls pests without poisoning the environment.
• Safety for Technicians and Family: From our professional applicators’ perspective, Acelepryn is much easier and safer to handle. There’s no harsh odor, no need for extensive protective gear beyond the basics, and no special re-entry restrictions once the product has dried on the lawn. For you as a homeowner, this means peace of mind – once the treated lawn has dried, your children and pets can resume use of the yard with no worry. (Of course, we always recommend letting any liquid treatment dry before re-entry.) This safety profile is backed by EPA evaluations: chlorantraniliprole is not carcinogenic, not neurotoxic, and not a skin irritant, and even if a toddler were to ingest some treated soil, the doses are far below any harmful leveloregon.govoregon.gov. Few lawn care products can claim such a margin of safety!
• Flexibility with Irrigation: While we always prefer to water in grub control products for optimal soil activation, Acelepryn offers more flexibility if immediate watering isn’t possible. It can be applied to dry turf and will wait for rainfall or the next irrigation event to move into the root zone. Once the spray dries on the grass, much of it binds to the leaf surface and some is absorbed, so it remains in place until watered in. In Austin’s hot summers, where watering schedules might be restricted to certain days, this is a tremendous advantage. You don’t have to panic if you can’t run sprinklers the same night after treatment (unlike with Dylox, which must be activated right away). Of course, timely watering will kickstart the grub control sooner, but Acelepryn is more forgiving to real-world constraints – it stays effective and doesn’t pose a hazard in the interim. We simply advise watering when you’re able to within a few days, and the product will do its job.
• Long Residual and “Extra” Protection: Acelepryn persists in the turf and soil for an extended period, providing long-lasting control. Even when we apply a specialized version like Acelepryn Xtra (more on that next), the chlorantraniliprole continues working for months. If we treat your lawn in mid-summer because you called about grub damage, that same application will keep protecting into fall. As mentioned, should an armyworm outbreak occur later in the season, your lawn is already protected as a bonus, without an extra treatment. This kind of residual activity simply isn’t achievable with older insecticides that break down quickly. Acelepryn essentially shields your lawn through the vulnerable period, so pests don’t get a second chance.

Preventative vs. Curative Treatments: Our Two-Product Approach

In an ideal world, we want to prevent grub infestations from ever causing damage. The best strategy – and our primary recommendation – is a preventative grub control application in spring using Acelepryn. By applying Acelepryn in April or May, we ensure the active ingredient is in the turf’s root zone by the time grub eggs hatch in summer. When the new grubs start feeding on your grassroots in July, they immediately ingest a lethal dose and die, often before you ever realize they hatched. This preventive approach has been proven the most effective: studies show that insecticides like chlorantraniliprole (Acelepryn) used preventatively in summer can virtually eliminate the next generation of grubs, whereas trying to kill large grubs in fall is much less reliable. We encourage all our clients in the Austin, Bee Cave, and Georgetown areas to opt for this annual preventive grub treatment as part of our Austin lawn care programs.

That said, what if you didn’t apply a preventative and now it’s August or September and you suddenly have a grub problem? This is where our second product comes in: Acelepryn Xtra. Acelepryn Xtra is a newer formulation that combines chlorantraniliprole with a second active ingredient (thiamethoxam, a systemic neonicotinoid) to broaden its spectrum and add some quick curative kick. With two modes of action, Acelepryn Xtra can knock down existing grubs even a bit later in their development (up to second instar) while still providing the same residual protection chlorantraniliprole is known for. Essentially, if you call us in late summer with visible grub damage, we will apply Acelepryn Xtra as a curative measure. The thiamethoxam in it starts working on those active grubs to stop further root feeding damage, and the chlorantraniliprole then remains in the turf to prevent any newly hatched grubs (or other pests) from surviving. One application of Acelepryn Xtra in July or August can rescue your lawn from current grub injury and protect it for the remainder of the season. As a bonus, Acelepryn Xtra also controls surface pests like ants and improves chinch bug control, thanks to that added ingredient – an “Xtra” benefit, pun intended.

It’s important to note that even the best curative treatment isn’t as ideal as preventing damage in the first place. By the time grubs have caused brown patches, your lawn has already suffered stress. We can kill the grubs to stop further harm, but the grass may need time and care to recover (and in severe cases of infestation, some patches might require reseeding or resodding). So, while we’re fully equipped to handle grub emergencies with Acelepryn Xtra, our agronomist-guided advice is: opt for the preventative Acelepryn treatment each spring. It’s the most cost-effective and worry-free approach to grubworm control – essentially an insurance policy for your turf. Preventative treatments are the cornerstone of our “lawn care near me” services for Austin and surrounding areas when it comes to grub and armyworm management.

A Note on Watering and Timing

Whether preventive or curative, we do still follow best practices to ensure the product works optimally. After applying Acelepryn (or Acelepryn Xtra), we aim to get it watered into the root zone within a reasonable timeframe (usually within a day or two) so it can contact feeding grubs. If Mother Nature cooperates with rainfall, great – otherwise, we advise running your irrigation system or sprinklers for a good soak (about 0.5 inches of water). This not only moves the insecticide into the soil where grubs reside, but also ensures any residue is washed off grass blades into the ground, making the lawn safely usable after it dries. Acelepryn’s flexibility means if immediate watering isn’t possible due to Austin’s watering schedules, the product will patiently sit on the turf until the next opportunity. Still, prompt watering yields faster results – and we want those grubs controlled as soon as possible to halt damage.

In terms of timing:

• Preventative (Acelepryn): We schedule this in mid-spring to early summer (roughly April through June). Chlorantraniliprole has a wide application window – it can be applied early and still be effective when grubs hatch weeks or months later. In fact, applying in spring allows plenty of time for the product to distribute in the soil. (Michigan State University Extension notes that chlorantraniliprole ideally should be applied by late May or June for best results, since it takes longer to fully position itself in the soil compared to faster-moving insecticides. Here in Texas, an April/May application is perfect to target fall grubs.)
• Curative (Acelepryn Xtra): If needed, this is applied at the first sign of grub activity in the lawn, typically mid-summer (July) through early fall. As soon as you notice grub damage (or we see it during a service visit), quick action is key. Thanks to the added thiamethoxam, Acelepryn Xtra gives some curative effect on smaller grubs present at application. However, if grubs are very large (late instar or nearly done feeding), any curative treatment is less effective – they may have already done most of their feeding. That’s why we stress prevention; but rest assured, if you call us and grubs are munching on your lawn in July/August, we have the tools to fight back immediately.

And don’t forget, that curative Acelepryn Xtra application will continue protecting your lawn afterward. For instance, as mentioned earlier, if armyworm moths lay eggs on your lawn in September, any hatching caterpillars will be controlled by the insecticide residue taken up in the grass. Many of our customers love hearing that the grub treatment we applied doubles as an armyworm preventative later on – it’s efficient and provides peace of mind during the unpredictable Central Texas fall pest season.

Conclusion: Professional Lawn Care that Prioritizes Efficacy and Safety

As a professional lawn care provider in the Austin area, Century Outdoor Services has evaluated many products and methods for pest control. Our choice to use Acelepryn (and its combination variant Acelepryn Xtra) for grubworm and armyworm control is backed by science and experience. In summary, we use Acelepryn because it works better and is safer than other options:

• It offers highly effective grubworm control — wiping out grubs before they destroy your lawn.
• It provides a long residual, continuing to shield your turf from pests for months.
• It protects against multiple pests (grubs, caterpillars, billbugs, etc.) with one treatment.
• It has a minimal environmental footprint – preserving beneficial insects, posing virtually no risk to pollinators, and qualifying as a reduced-risk pesticideoregon.gov.
• It is user-friendly and pet-friendly, with no strong odors or stringent re-entry restrictions once dry, and lacking the hazard warnings of older insecticidesoregon.gov.
• It fits our local needs, remaining effective even under Austin’s watering constraints and climatic conditions.

In short, Acelepryn allows us to solve our customers’ grub and armyworm problems without compromising safety or quality. We’ve been using it for the past few years with outstanding results – healthier lawns and happy clients, and we’ve been very happy with it ourselves. It’s the kind of product that lets us, as lawn care experts, sleep well at night knowing we’re doing right by both the turf and the environment.

If you have concerns about grubworms or armyworms in your lawn, or you want to get ahead of these pests with a preventive treatment, give us a call. Our team of knowledgeable technicians (with agronomy backgrounds) will assess your lawn and tailor a solution – likely involving Acelepryn for the reasons above – to protect your grass. Whether you’re in Austin, Bee Cave, Georgetown, or the surrounding area, we’re ready to help you achieve a pest-free, thriving lawn.

Don’t let grubs snack on your grassroots or armyworms march across your yard unchecked. With the right product and professional approach, you can enjoy a beautiful lawn year-round. Century Outdoor Services is committed to providing the safest and most effective lawn care solutions – and that’s why we choose Acelepryn for grubworm control, to deliver superior results for our customers and our environment. Here’s to a lush, green, grub-free lawn!

Sources: We base our program on extensive research and product data, including manufacturer information and university extension publications. Key references include Syngenta’s product labels and Greencast technical guides for Acelepryn, independent university studies on insecticide safety and efficacy (Michigan State University, University of Kentucky), and our own field experience in Austin’s unique conditions. All indicate that Acelepryn is a standout choice for keeping lawns free of grubworms and armyworms in a responsible way. (For further reading or inquiries about our sources, feel free to contact us!)