How to Get Rid of Armyworms: 11 Effective Strategies for Pest Control

Discover powerful strategies to eliminate armyworm infestations in your garden. Learn how to get rid of armyworms effectively and protect your crops from damage.

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Armyworms are destructive pests that can wreak havoc on your garden and crops if left unchecked. These voracious insects can quickly strip your plants of their foliage, leading to significant yield losses. In this comprehensive guide, we’ll delve into the various methods to effectively combat armyworm infestations and safeguard your plants. From natural remedies to chemical interventions, you’ll find a range of strategies that cater to different preferences and situations.


How to Get Rid of Armyworms: 11 Proven Strategies


1. Early Detection and Monitoring

Spotting armyworms early is crucial for effective control. Regularly inspect your plants for signs of damage, such as chewed leaves and frass (insect waste). Set up pheromone traps to monitor adult armyworm activity, allowing you to take action at the right time.

2. Handpicking

For smaller infestations, manually removing armyworms from your plants can be surprisingly effective. Wear gloves and drop the caterpillars into a bucket of soapy water. This method is environmentally friendly and minimizes the use of chemicals.

3. Beneficial Insects

Beneficial insects play a crucial role in maintaining a balanced ecosystem in your garden and can be powerful allies in your battle against armyworms. These insects act as natural predators, keeping pest populations in check and reducing the need for chemical interventions. Here’s how you can leverage the power of beneficial insects to effectively control armyworm infestations:

Parasitic Wasps:

Parasitic wasps are small insects that lay their eggs inside armyworm caterpillars. As the eggs hatch, the wasp larvae consume the caterpillar from the inside, eventually killing it. These wasps are highly effective at reducing armyworm numbers without causing harm to other beneficial insects or the environment. To attract parasitic wasps to your garden:

  • Plant Nectar-Rich Flowers: Parasitic wasps feed on nectar, so planting a variety of nectar-rich flowers like marigolds, sunflowers, and zinnias can attract them to your garden.
  • Provide Shelter: Parasitic wasps need shelter to thrive. Create suitable habitat by leaving some patches of wild vegetation or providing small shelters for them to rest and reproduce.
  • Avoid Broad-Spectrum Pesticides: Refrain from using pesticides that indiscriminately target all insects. These pesticides can harm beneficial insects and disrupt the natural balance in your garden.

Birds as Predators:

Many bird species are natural predators of armyworms and can significantly contribute to pest control. Birds like sparrows, swallows, and bluebirds feed on adult moths, caterpillars, and pupae. Attracting these feathered allies involves:

  • Bird Feeders: Set up bird feeders with seeds that attract insect-eating birds. These feeders can provide an additional food source that encourages birds to stay in your garden.
  • Provide Water: A bird bath or shallow container of water can attract birds seeking hydration. Birds are more likely to frequent areas with a readily available water source.
  • Plant Native Plants: Native plants provide birds with familiar food sources and habitat. Research native plant species in your region that can help attract insect-eating birds.

Beneficial Nematodes:

Beneficial nematodes are microscopic roundworms that can effectively control armyworm larvae in the soil. These nematodes enter the caterpillars’ bodies, releasing bacteria that kill the larvae. To introduce beneficial nematodes:

  • Choose the Right Species: Different species of beneficial nematodes target different pests. Make sure to select nematodes that are effective against armyworm larvae.
  • Follow Application Instructions: Beneficial nematodes are usually applied as a soil drench or through irrigation. Follow the package instructions carefully to ensure proper application.
  • Maintain Moisture: Beneficial nematodes require moisture to move through the soil and find their target. Water the soil before and after application to ensure their effectiveness.

By creating a welcoming environment for these beneficial insects, you can establish a natural balance in your garden that helps keep armyworm populations in check. Remember that it might take some time for these allies to establish themselves, so patience is key. With a combination of natural predators, beneficial nematodes, and other integrated pest management strategies, you can achieve effective and sustainable armyworm control while minimizing the need for chemical interventions.

4. Neem Oil Spray

Neem oil is a natural insecticide that disrupts the armyworms’ life cycle and feeding patterns. Mix neem oil with water and apply it to your plants, focusing on the undersides of leaves. Reapply after rain and as needed.

5. Bacillus Thuringiensis (BT)

BT is a microbial insecticide that targets armyworm larvae without harming beneficial insects. Spray the solution on your plants, and as the caterpillars ingest it, they’ll stop feeding and eventually die.

6. Diatomaceous Earth

Diatomaceous earth is a powdery substance that damages the armyworms’ outer shells, leading to dehydration and death. Sprinkle a thin layer on plant foliage and around the base.

7. Intercropping and Crop Rotation

Armyworms often prefer certain plants. By diversifying your garden with intercropping and rotating crops annually, you can disrupt their life cycle and reduce infestation risks.

8. Floating Row Covers

Covering vulnerable plants with lightweight fabric barriers prevents adult moths from laying eggs on them. Ensure the covers are securely anchored to prevent pests from sneaking underneath.

9. Chemical Insecticides

As a last resort, consider using chemical insecticides labeled for armyworm control. Follow instructions carefully and avoid harming beneficial insects, pollinators, and other non-target organisms.

10. Traps and Attractants

Aside from pheromone traps, you can also use light traps at night to attract and capture adult moths. Additionally, placing saucers of sugary water in your garden can attract and drown adult moths.

11. High-pressure Water Spray

A forceful stream of water can dislodge armyworms from plants. Regularly spray your plants, focusing on the undersides of leaves where the caterpillars often hide.


How to Get Rid of Armyworms: FAQs

Can armyworms destroy an entire crop?

Yes, armyworms have the potential to cause significant damage to crops if their population goes unchecked. These voracious caterpillars feed on leaves and foliage, and in large numbers, they can strip plants of their vegetation, leading to reduced yields and even complete crop loss. It’s essential to implement effective control measures to prevent such devastating outcomes.

What are the signs of an armyworm infestation?

Detecting an armyworm infestation early is crucial for effective control. Look out for chewed leaves, irregular holes in foliage, and the presence of green or brown caterpillars on your plants. You might also notice dark pellets of insect waste, known as frass, around the plants. Regular monitoring of your garden can help you identify these signs promptly.

Can I use natural methods to control armyworms?

Absolutely, there are several natural methods that you can employ to control armyworm populations. Neem oil, for instance, is a popular organic option. Neem oil disrupts the armyworms’ feeding patterns and life cycle, eventually leading to their demise. Additionally, introducing beneficial insects such as parasitic wasps and birds that feed on armyworms can help maintain a balanced ecosystem and control their numbers naturally.

How do chemical insecticides work against armyworms?

Chemical insecticides designed for armyworm control work by targeting the nervous system or other physiological processes of the caterpillars. One such example is Bacillus thuringiensis (BT), a microbial insecticide. When armyworm larvae consume plants treated with BT, the bacteria disrupt their digestive systems, causing them to stop feeding and eventually die. It’s crucial to follow the instructions on the insecticide label and use them responsibly.

Are there any risks associated with chemical insecticides?

While chemical insecticides can effectively control armyworm populations, they should be used with caution. These chemicals can harm not only the targeted pests but also beneficial insects, pollinators, and other non-target organisms. It’s important to consider the potential impact on the environment and opt for chemical interventions only when other methods have proven ineffective or when infestations are severe.

How can I prevent armyworm infestations in the future?

Preventing armyworm infestations involves a combination of proactive measures. Good garden hygiene is essential—remove weeds, debris, and other potential hiding spots for the pests. Implement crop rotation and intercropping to disrupt their life cycle and make it harder for them to find suitable hosts. Regularly monitor your plants for signs of infestation so you can take action early if needed.

Can armyworms be harmful to humans?

No, armyworms are not harmful to humans. They do not bite, sting, or transmit diseases. Their primary focus is on consuming plant material, making them a threat mainly to crops and vegetation.

Are there specific plants that are more susceptible to armyworm infestations?

Yes, certain plants are more attractive to armyworms than others. For instance, grasses, corn, wheat, and various vegetables are commonly targeted by these pests. However, armyworms can also feed on a wide range of other plants. By diversifying your garden with a variety of plants, you can potentially reduce the risk of large-scale infestations.

Can I use traps to control armyworm populations?

Yes, traps can be a valuable tool in controlling armyworm populations. Pheromone traps, for example, use synthetic versions of the insects’ mating pheromones to attract and trap adult moths. Light traps placed in the garden at night can also help capture adult moths. While traps might not eliminate infestations entirely, they can help reduce the number of adult moths, thereby limiting future infestations.

How does crop rotation help with armyworm control?

Crop rotation is a practice that involves planting different crops in the same area each growing season. This strategy disrupts the armyworms’ life cycle, as they often prefer specific plants. By planting different crops in succession, you make it challenging for armyworms to locate suitable host plants, thereby reducing the likelihood of infestations and helping maintain healthier soil.

What is the role of beneficial nematodes in armyworm control?

Beneficial nematodes are microscopic roundworms that can help control armyworm populations. These nematodes are parasitic to insects, including armyworm larvae. When introduced to the soil, they seek out and infect the caterpillars, ultimately causing their death. Beneficial nematodes provide a natural and environmentally friendly method of reducing armyworm numbers.

How do I apply neem oil for armyworm control?

Neem oil is a versatile and natural insecticide that can be effective against armyworms. To apply neem oil, dilute it according to the instructions on the product label and spray it onto the plants. Make sure to cover both the upper and lower surfaces of the leaves, as armyworms often feed on the undersides. Reapply the neem oil as needed, especially after rain or heavy irrigation.

Can high-pressure water spray help with armyworm control?

Yes, using a high-pressure water spray can help dislodge armyworms from your plants. Caterpillars often hide on the undersides of leaves, making them challenging to spot. A forceful stream of water can knock them off the plants, making it difficult for them to return. Regularly spraying your plants with water is an eco-friendly approach to managing armyworm infestations.

How do floating row covers protect plants from armyworms?

Floating row covers are lightweight fabrics that create a physical barrier between your plants and potential pests. When properly secured, these covers prevent adult moths from laying their eggs on the plants. This, in turn, reduces the number of armyworm larvae that hatch and feed on your crops. Floating row covers are especially useful for protecting young plants from infestations.

What should I do if chemical insecticides are my last resort?

If you’ve exhausted natural and organic methods and are considering chemical insecticides as a last resort, it’s essential to choose products labeled specifically for armyworm control. Read and follow the manufacturer’s instructions meticulously to ensure safe and effective application. Consider the potential impact on non-target organisms and apply the chemicals responsibly to minimize risks.

Are there any risks to using diatomaceous earth?

Diatomaceous earth, a natural powdery substance, can be effective against armyworms by damaging their exoskeletons. However, it can also harm beneficial insects if not used carefully. It’s important to apply diatomaceous earth only to the areas where armyworms are present and avoid dispersing it too broadly. Additionally, wear protective gear to prevent inhaling the fine particles.

Can I use multiple strategies simultaneously for better results?

Absolutely, using a combination of strategies can often yield the best results in controlling armyworm infestations. For example, integrating natural methods like introducing beneficial insects with targeted interventions like neem oil application can create a more comprehensive and effective approach. Just remember to monitor the impact of each strategy and adjust your tactics accordingly.

What can I do to attract natural predators of armyworms?

To attract natural predators like parasitic wasps and birds to your garden, consider planting nectar-rich flowers and providing suitable habitat. Flowers like marigolds, alyssum, and daisies can entice beneficial insects, while providing bird feeders, bird baths, and nesting sites can encourage birds that feed on armyworms and other garden pests.

Can I use traps to target adult armyworm moths?

Yes, traps designed to target adult armyworm moths can help reduce their population. Pheromone traps release synthetic versions of the female moth’s mating pheromones, luring male moths into the trap. This interrupts their reproductive cycle and can lead to a decrease in the number of eggs laid, ultimately lowering the overall armyworm population.

How do I ensure the success of intercropping?

Intercropping involves planting different crops together in the same area. To ensure success, consider the growth habits, nutrient requirements, and pest susceptibility of the crops you’re interplanting. Choose plant combinations that complement each other and avoid planting crops that are susceptible to the same pests. Proper spacing and regular monitoring are also essential to maximize the benefits of intercropping.

Can I use homemade remedies for armyworm control?

While there are various homemade remedies suggested for armyworm control, their effectiveness can vary. Some common options include garlic or onion sprays, chili pepper solutions, and soap-water mixtures. While these may have limited impact, they might not provide comprehensive control, especially in the case of severe infestations. It’s advisable to combine homemade remedies with other proven methods for better results.

How do I create a favorable environment for beneficial insects?

To create a favorable environment for beneficial insects that prey on armyworms, focus on providing food, water, and shelter. Plant a diverse range of flowering plants that produce nectar and pollen, which attract these insects. Avoid using broad-spectrum pesticides that might harm beneficial species. Additionally, consider leaving some undisturbed areas in your garden for shelter and nesting.

Can I use companion planting to deter armyworms?

Yes, companion planting involves growing specific plants alongside each other to provide mutual benefits. Certain plants, like marigolds, garlic, and chives, are believed to repel armyworms and other pests. Integrating these plants into your garden can help deter infestations. However, it’s important to note that companion planting is just one aspect of an integrated pest management strategy and may not be entirely effective on its own.

How can I prevent armyworms from becoming resistant to control methods?

To prevent armyworms from developing resistance to control methods, it’s crucial to rotate and diversify your pest management strategies. Relying solely on a single method, such as chemical insecticides, can lead to resistance over time. By alternating between different approaches—like natural predators, biological controls, and targeted interventions—you make it harder for armyworms to adapt and develop resistance.

What is the life cycle of an armyworm?

The life cycle of an armyworm consists of several stages: egg, larva (caterpillar), pupa, and adult. Adult moths lay eggs on host plants, which hatch into hungry caterpillars. The caterpillars go through several molts as they grow, consuming plant material along the way. Once fully grown, they pupate in the soil, eventually emerging as adult moths to begin the cycle anew.

Can armyworms overwinter and return in the spring?

Yes, some species of armyworms can overwinter in the pupal stage and emerge as adult moths in the spring. These moths can lay eggs on plants, initiating new infestations. To prevent overwintering armyworms from causing future problems, it’s essential to remove and dispose of crop debris and maintain proper garden hygiene during the fall and winter months.

Are there any cultural practices that deter armyworms?

Cultural practices that promote healthy plant growth and discourage armyworm infestations include proper watering, fertilization, and pruning. Well-maintained plants are often more resilient to pest attacks. Additionally, removing weeds and other vegetation around your garden can eliminate potential hiding spots and reduce the chances of armyworms finding suitable hosts.

Can weather conditions impact armyworm infestations?

Yes, weather conditions can influence the prevalence of armyworm infestations. Warm and humid weather can favor their reproduction and development, leading to more rapid population growth. Conversely, cold or dry conditions can slow down their life cycle. Monitoring weather patterns can provide insights into when armyworms might become more active, allowing you to adjust your control strategies accordingly.

What is the role of natural predators in armyworm control?

Natural predators play a vital role in maintaining ecological balance and controlling armyworm populations. Birds, parasitic wasps, predatory beetles, and spiders are among the many creatures that feed on armyworms at different life stages. Creating an environment that attracts and supports these predators can contribute to effective long-term pest management.

Are there any DIY traps I can make to catch armyworm moths?

Yes, you can create DIY traps to catch adult armyworm moths. A simple trap can be made using a light source, like a lamp or lantern, placed near a white sheet. At night, moths are attracted to the light and will gather on the sheet. You can then carefully collect and dispose of the trapped moths. While this method may not eliminate all moths, it can help reduce their numbers.

How can I differentiate armyworms from other caterpillars?

Armyworms can be identified by their distinctive behavior and appearance. They often move in a group, resembling an “army” as they march together across plants. Additionally, armyworms have a smooth body with distinct stripes along their sides. Their head capsule is darker in color, and they typically have a more prominent “Y” or “V” shape on their face compared to other caterpillar species.

Are there any armyworm-resistant plant varieties?

Yes, some plant varieties are more resistant to armyworm infestations than others. For example, certain types of corn, soybeans, and wheat have been bred to have increased tolerance to armyworm feeding. Research and choose plant varieties that are known to exhibit resistance to armyworm damage, as this can be a proactive approach to reducing the risk of infestations.

How long can an armyworm infestation last?

The duration of an armyworm infestation can vary based on factors such as weather conditions, available food sources, and control methods employed. Some infestations may last only a few weeks, while others can persist for several months. Swift and effective action, along with consistent monitoring, can help bring infestations under control and limit their duration.

What should I do if I suspect an armyworm infestation?

If you suspect an armyworm infestation in your garden or crops, take immediate action. Begin by inspecting your plants for signs of damage and the presence of caterpillars. Consider using natural methods like handpicking, introducing beneficial insects, or applying neem oil. If the infestation is severe or not responding to natural methods, consult local gardening resources or professionals for guidance on appropriate chemical interventions.

Can I use biological controls as a long-term solution?

Yes, biological controls, such as beneficial insects and nematodes, can be used as part of a long-term integrated pest management strategy. These methods can help maintain a balanced ecosystem and provide ongoing control of armyworm populations. By creating a habitat that supports natural predators, you can establish a more sustainable approach to managing armyworms over the long term.

How can I attract birds to my garden for armyworm control?

To attract birds that prey on armyworms and other pests, offer a variety of bird-friendly features in your garden. Plant native trees and shrubs that provide shelter and nesting sites. Install bird feeders filled with seeds that attract insect-eating birds. Providing a water source like a birdbath can also entice birds to visit and help keep pest populations in check.

Are there any armyworm-specific pesticides available?

Yes, there are insecticides specifically formulated for controlling armyworm infestations. These products target armyworms without harming beneficial insects and other non-target organisms. Look for insecticides labeled for armyworm control and follow the instructions carefully to ensure effective and safe application. Remember that using targeted pesticides should be a last resort after considering other eco-friendly methods.

Can I prevent armyworms through proper watering?

While proper watering won’t entirely prevent armyworm infestations, it can contribute to overall plant health, making them less susceptible to pests. Consistent and adequate watering helps plants tolerate stress and recover more effectively from pest damage. However, using only proper watering practices might not be sufficient to prevent or control armyworm infestations on their own.

How does the timing of control measures impact effectiveness?

The timing of control measures is critical for their effectiveness against armyworms. Many methods are most effective when applied during the early stages of the caterpillars’ life cycle. For instance, applying Bacillus thuringiensis (BT) or other insecticides when the caterpillars are small and actively feeding can yield better results. Regular monitoring and early intervention are key to maximizing the impact of control measures.

How do I ensure that my chosen control method is working?

Regular monitoring is essential to ensure the success of your chosen control method. Keep a close eye on your plants and look for signs of reduced damage or fewer caterpillars. Compare the condition of your plants before and after implementing the control method. If you’re using traps or biological controls, observe the number of trapped moths or the presence of beneficial insects. Adjust your approach as needed based on your observations.

What is the role of soil health in armyworm management?

Healthy soil can indirectly contribute to armyworm management by promoting plant vigor and resilience. Well-nourished plants are better equipped to withstand pest attacks and recover from damage. Consider enriching your soil with organic matter and appropriate nutrients to create a favorable growing environment for your plants. This can indirectly support your efforts to manage armyworm infestations.

Can I use compost to deter armyworms?

Compost can enhance soil health and plant vigor, which can indirectly deter armyworms. Healthy plants are less vulnerable to pest attacks, making them less appealing to armyworms. Incorporating compost into your soil can improve its structure, water retention, and nutrient content, leading to stronger and more resilient plants that are better equipped to fend off pests.

How can I prevent armyworms from spreading to other areas?

To prevent the spread of armyworms to other areas, take precautions when working in infested areas. Avoid carrying caterpillars or eggs on your clothing or gardening tools. If you need to move plants from an infested area to another part of your garden, inspect them thoroughly and shake them to dislodge any hiding insects. Implement proper sanitation practices to minimize the risk of unintentional spread.


When faced with an armyworm infestation, swift and strategic action is key to preventing significant damage to your garden and crops. By incorporating a combination of the strategies outlined in this guide, you can effectively control and eliminate these destructive pests. Remember that a balanced approach that integrates natural solutions and targeted interventions will lead to the best results for both your plants and the environment.