Army worms move in large groups and can strip a lawn of its green color in a single day. If you are searching for how to get rid of army worms, you have come to the right place. These pests are aggressive, fast-moving, and can ruin your grass before you even notice them. Acting quickly is the only way to save your yard.
In this guide, you will learn step-by-step methods to identify, control, and prevent army worm infestations. We cover natural remedies, chemical treatments, and long-term lawn care tips. By the end, you will have a clear plan to protect your turf.
What Are Army Worms And Why Are They Dangerous
Army worms are the larvae of a moth species. They get their name because they move in large groups, like an army. They feed on grass blades, leaves, and stems. In just 24 hours, a heavy infestation can turn a green lawn into a brown, dead mess.
These pests are most active in warm weather. They prefer well-watered, fertilized lawns. If you see small brown patches that grow quickly, army worms might be the cause.
How To Spot Army Worms Early
Early detection is key. Look for these signs:
- Small, irregular brown patches in your lawn
- Birds or wasps gathering on your grass (they eat army worms)
- Grass that looks like it has been cut at the base
- Greenish-brown caterpillars with stripes along their bodies
To confirm, mix a bucket of soapy water and pour it over a small patch of grass. If army worms are present, they will wiggle to the surface within minutes.
How To Get Rid Of Army Worms
Now let’s get into the main action. The exact phrase How To Get Rid Of Army Worms covers both natural and chemical methods. Below, we break down every effective strategy.
Natural Control Methods
If you prefer non-chemical solutions, start here. These methods are safe for pets, kids, and beneficial insects.
Beneficial Nematodes
These microscopic worms attack army worm larvae. They are harmless to plants and animals. Apply them in the evening when the soil is moist. Follow the package directions for mixing and coverage.
Neem Oil Spray
Neem oil disrupts the feeding and growth of army worms. Mix one teaspoon of neem oil with one quart of water and a few drops of dish soap. Spray directly on the affected grass. Repeat every 5-7 days until the infestation clears.
Diatomaceous Earth
This powder is made from fossilized algae. It cuts the worms’ bodies and dehydrates them. Sprinkle a thin layer over dry grass. Reapply after rain or watering. Be careful not to inhale the dust.
Soap And Water Drench
A simple solution of two tablespoons of liquid dish soap per gallon of water can kill army worms on contact. Pour it over the infested area. This method works best for small patches.
Chemical Control Options
For severe infestations, chemicals are often the fastest solution. Always read and follow label instructions. Wear gloves and protective gear.
Insecticides Containing Bifenthrin Or Cyfluthrin
These synthetic pyrethroids are very effective. Spray in the late afternoon or early evening when army worms are most active. Water the lawn lightly after application to help the product reach the soil.
Spinosad-Based Products
Spinosad is a natural substance from soil bacteria. It is less toxic to humans and pets but still kills army worms quickly. Apply as a spray and avoid direct sunlight to prevent breakdown.
Carbaryl (Sevin)
This is a broad-spectrum insecticide. It works fast but can also harm beneficial insects. Use it only as a last resort and spot-treat rather than covering the whole lawn.
When To Apply Treatments
Timing matters. Army worms feed mostly at night. Apply treatments in the late afternoon or early evening for best results. Also, treat when the grass is dry and there is no rain expected for 24 hours.
Preventing Future Army Worm Infestations
Stopping army worms before they arrive is easier than fighting them. Here are proven prevention tips.
Maintain A Healthy Lawn
Strong grass resists pests better. Mow at the correct height for your grass type. Water deeply but infrequently to encourage deep roots. Avoid over-fertilizing, which attracts moths.
Encourage Natural Predators
Birds, wasps, and ground beetles eat army worms. Install bird feeders or birdbaths. Plant flowers that attract beneficial insects like ladybugs and lacewings.
Use Milky Spore
This is a bacterial treatment that targets grubs and army worms. Apply it once in spring and once in fall. It stays in the soil for years and provides long-term protection.
Monitor Your Lawn Regularly
Walk your yard every few days during warm months. Look for brown patches or unusual bird activity. Early detection makes control much easier.
Step-By-Step Action Plan For Army Worm Control
Follow this plan if you have an active infestation. It combines detection, treatment, and recovery.
- Confirm the infestation. Use the soapy water test. If you see 3-5 worms per square foot, take action.
- Choose your treatment. For small areas, use nematodes or neem oil. For large areas, use a chemical insecticide.
- Apply in the evening. This is when worms are feeding and most vulnerable.
- Water lightly after treatment. This helps the product reach the worms hiding in the thatch.
- Reapply if needed. Check the lawn after 3-4 days. If you still see worms, apply again.
- Repair damaged grass. Rake out dead patches. Overseed with a fast-growing grass variety. Keep the area moist until new grass appears.
- Prevent future outbreaks. Follow the prevention tips above. Monitor your lawn weekly.
Common Mistakes To Avoid
Many homeowners make these errors when dealing with army worms. Avoid them for better results.
- Waiting too long. Army worms can destroy a lawn in days. Act as soon as you see signs.
- Using too much water. Overwatering can wash away treatments. Follow product instructions.
- Applying in direct sunlight. Many products break down in UV light. Apply in the evening.
- Ignoring the thatch layer. Army worms hide in thick thatch. Dethatch your lawn if needed.
- Not rotating treatments. Army worms can develop resistance. Alternate between different active ingredients.
How To Get Rid Of Army Worms In Specific Grass Types
Different grasses have different tolerances. Here is how to handle army worms in common lawn types.
Bermuda Grass
Bermuda is tough but can be damaged quickly. Use a fast-acting insecticide like bifenthrin. Overseed with Bermuda seed after treatment.
Fescue Grass
Fescue is more sensitive. Start with natural methods like nematodes. If chemicals are needed, use spinosad to minimize stress on the grass.
Zoysia Grass
Zoysia grows slowly and takes longer to recover. Prevent infestations with regular monitoring. Treat early with neem oil or beneficial nematodes.
St. Augustine Grass
This grass is prone to fungus after stress. Avoid overwatering after treatment. Use a fungicide if you see signs of disease.
Frequently Asked Questions About Army Worms
How Long Does It Take To Get Rid Of Army Worms?
With proper treatment, you can see results in 24-48 hours. Complete elimination may take 1-2 weeks. Reapply if needed.
Can Army Worms Kill My Lawn?
Yes, they can kill grass if left untreated. However, most lawns recover with proper care and reseeding.
Are Army Worms Harmful To Pets Or Humans?
No, army worms are not poisonous. They do not bite or sting. However, some insecticides can be harmful, so keep pets away during treatment.
What Is The Best Time Of Year To Treat Army Worms?
Late summer and early fall are peak seasons. Treat as soon as you see signs, regardless of the month.
How To Get Rid Of Army Worms Naturally Without Chemicals?
Use beneficial nematodes, neem oil, diatomaceous earth, or a soapy water drench. These methods are effective for small to moderate infestations.
Final Thoughts On Army Worm Control
Army worms are a serious threat to your lawn, but you can beat them. The key is speed and consistency. Use the methods in this guide to identify, treat, and prevent infestations. Remember to monitor your yard regularly and act at the first sign of trouble.
Your lawn can recover. With the right care, it will be green and healthy again in a few weeks. Stay proactive, and you will keep army worms away for good.
If you have a severe infestation that does not respond to home treatments, consider calling a professional lawn care service. They have access to stronger products and equipment. But for most homeowners, the steps above will work just fine.
Take action today. Your grass will thank you.