Bagworms are one of those yard problems that look minor until an arborvitae hedge or row of junipers suddenly turns brown. The fix is not complicated, but the timing matters. If you remove bags in winter or treat young larvae in late spring, you can usually stop the damage. If you wait until late summer when the bags are 1 to 2 inches long, sprays become much less reliable and replacement may be the better investment.
On our job sites, we treat bagworms as a plant health and property-value issue, not just a bug problem. A mature evergreen screen can cost thousands of dollars to replace, and bare brown sections on arborvitae, juniper, cedar, spruce, pine, or cypress often do not fill back in the way homeowners expect. The right plan is seasonal: remove what you can reach, monitor hatch, spray only when larvae are feeding, and bring in a pro when height, access, or plant value makes DIY work risky.
Here are the 8 practical ways to get rid of bagworms from your yard, with realistic 2026 costs, safety notes, and decision points.
1. Handpick Bagworms in Fall, Winter, and Early Spring
The most reliable low-cost control is also the least glamorous: physically remove the bags before eggs hatch. Bagworms have one generation per year in most U.S. landscapes. The eggs overwinter inside the female’s old bag, then hatch in late spring to early summer depending on your region.
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A single female bagworm can produce roughly 500 to 1,000 eggs. That means a hedge with 30 old bags can carry the potential for a serious infestation the next season. If you see dry, brown, cone-shaped bags hanging from twigs in fall or winter, do not leave them there.
For small shrubs and reachable evergreens, DIY handpicking usually costs $0 to $25. You need gloves, a bucket, pruning snips, and soapy water. Pull or clip the bags from the branches, then destroy them or submerge them in soapy water. Do not toss bags on the ground beside the shrub. Eggs inside intact bags can still hatch.
How to Handpick Correctly
Work from the top down and open the foliage by hand as you go. Arborvitae hedges are especially deceptive because the outside face may look clean while the shaded interior is loaded with bags. Check the back side, the property-line side, and the lower interior branches.
Use pruning snips when a bag is tightly wrapped with silk around a twig. Pulling hard can strip foliage or break small branches. For a 6-foot arborvitae, expect 5 to 15 minutes per plant if the infestation is moderate. For a dense 30-foot hedge, this can become a half-day job.
2. Prune Out Infested Tips and Dead Sections
Pruning helps when bagworms are concentrated on branch tips or when sections are already dead. It is not a substitute for monitoring and treatment, but it reduces the number of overwintering bags and improves the look of the plant.
Use bypass pruners or loppers and cut back to live foliage where possible. On many evergreens, especially arborvitae and juniper, cutting deep into old brown wood will not produce new green growth. That is why aggressive shaping can make the plant look worse. Prune the dead material you can remove cleanly, but do not assume a brown wall of arborvitae will grow back after being sheared.
DIY pruning costs are usually $0 to $50 if you already own hand tools. A pair of decent hand pruners often runs $15 to $35, and loppers can run $25 to $60. For tall hedges, pruning becomes an access and ladder-safety issue. If you cannot keep both feet stable and work at chest height, the job is moving out of normal homeowner territory.
When Pruning Is Not Enough
If more than 30% to 40% of an evergreen’s visible canopy is brown, especially on arborvitae, cedar, juniper, pine, or spruce, do not count on a full cosmetic recovery. Deciduous trees can often refoliate after defoliation. Evergreens are less forgiving. They may survive, but the bare sections can remain visible for years.
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Spraying too early is one of the most common ways homeowners waste money on bagworms. Most sprays work only after the eggs hatch and the young larvae begin feeding. In much of the U.S., that window is late May through June, but the exact timing shifts with climate, spring temperatures, and local conditions.
The practical rule is simple: look for tiny moving bags. Newly hatched larvae build small silk bags covered with bits of foliage. Early bags may be only about 1/8 to 1/4 inch long. If the bags are moving and the larvae are feeding, treatment can work. If you only see old brown bags in April, you are probably too early for spray. If you see large 1- to 2-inch bags in late summer, you are probably late.
Check susceptible plants every 7 to 10 days from mid-May through June. Inspect arborvitae, juniper, cedar, spruce, pine, cypress, and nearby deciduous trees. Bagworms spread by crawling and by young larvae ballooning on silk strands, so one untreated shrub row can keep reseeding nearby plants.
The Bag Size Rule
Tiny moving bags are treatable. Small larvae are feeding actively and are easier to control. Large bags in late summer are much harder to kill because mature larvae feed less, are better protected, and may be close to pupating. At that stage, shift your effort toward hand-removal, documenting the hot spots, and preparing for next year’s hatch.
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4. Use Bt on Small, Actively Feeding Larvae
Bt, short for Bacillus thuringiensis, is often the best first spray option when bagworms are young. It is a caterpillar-targeted material that must be eaten by the larvae, so coverage matters. It is not a contact spray that solves the problem just by touching the outside of the bag.
Bt works best when larvae are small, usually during the early hatch period in late May or June for many regions. Once bagworms get larger, control drops off. That is why calendar timing and inspection matter more than simply buying a product labeled for caterpillars.
In 2026, Bt concentrate commonly costs about $10 to $35 per bottle. A basic 1- to 2-gallon pump sprayer typically costs about $18 to $60 at big-box stores. Larger battery backpack sprayers can push setup cost above $100, but they make sense if you have a long hedge or multiple plantings.
Spray Coverage Technique
Spray on a calm, dry day when rain is not imminent and the product label allows the current temperature and plant conditions. Avoid treating drought-stressed plants in high heat unless the label specifically permits it. For valuable ornamentals, use a small test spray on a hidden section if the label allows, then watch for phytotoxicity before treating the entire hedge.
Dense arborvitae requires more than a light mist on the outside face. Open the foliage and target the inner canopy where larvae feed. Wet the foliage enough for even coverage without runoff. If the product label calls for repeat application, follow the interval exactly. The label is the law, and it controls mixing rate, protective equipment, reentry timing, plant restrictions, and environmental precautions.
5. Use Spinosad When Larvae Are Somewhat Larger
Spinosad is another common bagworm option, especially when larvae are past the ideal Bt window but still feeding. Like Bt, it must be ingested, so full foliage coverage is still the job. It is not a magic late-summer rescue for mature bags.
In 2026, spinosad concentrate commonly runs about $25 to $55 per bottle. Actual cost per treatment depends on label rate, plant height, canopy density, and whether repeat applications are required. A small row of young shrubs may use only part of a bottle. A tall, dense evergreen screen may require enough material and labor that a professional quote becomes worth comparing.
Spinosad can affect some beneficial insects if misused, so do not spray casually. Treat when bagworms are present and feeding, avoid open blooms where pollinators are active unless the label allows it, and apply during calm conditions to reduce drift. Keep children, pets, and foot traffic out of the treatment area until the label’s reentry instructions are satisfied.
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Carbaryl, permethrin, bifenthrin, and other labeled residual insecticides may be listed for bagworm control on some products. They can be useful for heavier infestations, larger larvae, or situations where lower-impact materials are no longer the best fit. But they also carry more risk to beneficial insects and non-target areas, so they should not be the first move for every yard.
Homeowner broad-spectrum concentrates often cost about $15 to $35 in 2026. The bigger cost is not the bottle; it is the consequence of poor application. Drift onto vegetables, flowers, water features, neighboring property, or hardscape can create problems. Overmixing does not improve control and can injure plants or violate the label.
Read the label before buying, then again before mixing. Confirm the product is labeled for the plant you are treating and the pest you are targeting. Follow the specified rate, protective equipment, application interval, and weather restrictions. If the label and a general online article disagree, the label wins.
Why Late Sprays Usually Disappoint
By late summer, visible brown bags often mean the effective spray window has passed. Mature larvae feed less and are protected inside larger bags. Spraying large 1- to 2-inch bags may make the homeowner feel like something is being done, but control is often poor. At that point, remove accessible bags, protect plant health, and plan for next spring’s monitoring window.
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7. Hire an Arborist or Licensed Applicator for Tall or Valuable Plants
DIY bagworm control makes sense for shrubs you can safely reach from the ground. It becomes a different job when the affected plant is 12, 20, or 40 feet tall, near a house, close to power lines, or part of an expensive landscape screen.
For high-value trees and mature evergreen rows, consider an ISA Certified Arborist, licensed pesticide applicator, or plant health care company. A good pro should confirm the insect, estimate severity, inspect nearby hosts, explain the treatment window, and tell you honestly whether treatment, pruning, trunk injection, or removal makes economic sense.
One-time general pest-control visits in 2026 commonly run around $100 to $300 nationally, with some pricing guides showing averages near $171 and others listing standard one-time treatments around $250 to $400. Tree and shrub canopy work can cost more than a perimeter pest service because it requires more material, better equipment, taller reach, and more careful coverage.
Arborist projects in 2026 commonly range from about $300 to $1,800, with national averages around $800 for many services. A small diagnosis-only visit may be less. Tall conifers, difficult access, bucket-truck work, repeat visits, and plant health programs can move the price higher.
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8. Replace Unrecoverable Shrubs and Prevent Reinfestation
Sometimes the right answer is replacement. This is especially true for arborvitae hedges with large bare brown panels, junipers stripped through the center, or evergreens that have lost major foliage during drought stress. Repeated treatments plus years of poor appearance can cost more than replacing the worst plants.
Tree and shrub removal costs vary widely. In 2026, national tree-removal ranges commonly fall around $200 to $2,000 or more, with averages roughly $750 to $906 depending on the source. Small ornamental shrubs may cost far less, especially if access is easy and stump grinding is not needed. Tall trees near structures, fences, utilities, or tight side yards can cost several thousand dollars.
Before removing regulated trees, check local rules. Many cities require permits for removing protected trees, street trees, heritage trees, or trees over a certain trunk diameter. Requirements vary by municipality. A small dead shrub in a private foundation bed may not need a permit, while a mature tree near the right-of-way might.
When replacing, do not plant the same vulnerable screen and ignore the source of reinfestation. Inspect neighboring shrubs, property-line hedges, and nearby conifers. If a shared hedge is infested, coordinate with the neighbor so one untreated side does not keep producing larvae.
Bagworm Control Cost Table for 2026
| Method | Typical 2026 Cost | Best Use | Limitations |
|---|---|---|---|
| Handpicking bags | $0 to $25 | Small shrubs, reachable arborvitae, fall through early spring | Labor-heavy; missed bags can hatch |
| Pruning infested tips | $0 to $60 for basic tools | Localized damage and reachable dead tips | Evergreens may not regrow from old brown wood |
| DIY pump sprayer | $18 to $60; backpack sprayers often $100+ | Low to medium shrubs and hedges | Requires safe access and full canopy coverage |
| Bt concentrate | $10 to $35 per bottle | Small larvae in late spring or early summer | Weak results on large larvae; must be eaten |
| Spinosad concentrate | $25 to $55 per bottle | Somewhat larger feeding larvae | Still timing-sensitive; label restrictions apply |
| Broad-spectrum concentrate | $15 to $35 per bottle | Heavier infestations when labeled and justified | Higher non-target risk; poor late-season results |
| Professional treatment | Often $100 to $400+ for smaller jobs; several hundred dollars or more for tall/dense canopy work | Tall shrubs, mature trees, repeat service, difficult access | Local pricing varies by height, density, and equipment |
| Removal and replacement | Small shrubs vary widely; tree removal often $200 to $2,000+ | Irreversible evergreen damage | May require permits; replacement plants add cost |
Seasonal Decision Guide
| Season | What You See | Best Move |
|---|---|---|
| Fall to early spring | Dry brown bags attached to twigs | Handpick or prune bags before eggs hatch |
| Mid-May to June | Tiny moving bags and fresh feeding damage | Use Bt or another labeled product with full coverage |
| June to early July | Small to medium feeding larvae | Consider spinosad or labeled residual products if needed |
| Late July to September | Large 1- to 2-inch bags, brown sections | Stop relying on sprays; remove bags and assess plant recovery |
| Any time | Tall trees, power-line proximity, major defoliation | Call an arborist or licensed applicator |
When to DIY and When to Hire a Pro
DIY is a good fit when the plants are under about 8 feet tall, the bags are reachable from the ground, the infestation is light to moderate, and you can spray without drift onto neighboring property, water, food crops, or play areas. It is also a good fit for winter handpicking, which is slow but straightforward.
Hire a pro when the plant is too tall to treat safely, when a ladder would be required on uneven ground, when the tree is near power lines, or when the plant is valuable enough that guessing is expensive. Also hire help if the infestation spans multiple mature trees or if you cannot get spray into the inner canopy of a dense hedge.
Ladder work deserves respect. Construction crews treat ladders as access equipment, not work platforms for awkward overhead spraying. If you are leaning, twisting, or reaching with a loaded sprayer, the job is already outside a safe homeowner setup. Professional tree care also has its own hazards, including falling limbs, rigging, traffic, utilities, and chemical handling.
If removal is on the table, ask about permits before work starts. Local rules can apply to street trees, protected species, large-diameter trunks, and trees in regulated zones. Permit requirements differ from city to city, so do not assume a contractor can legally remove a tree just because it is on private property.
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Help Damaged Evergreens Recover
Killing bagworms does not instantly restore a damaged evergreen. After treatment or hand-removal, support the plant without pushing it too hard. Water deeply during drought, especially for shallow-rooted shrubs near foundations, driveways, and reflected heat. A slow soak once or twice a week during dry periods is usually better than a quick daily splash.
Maintain a 2- to 3-inch mulch layer over the root zone, but keep mulch pulled several inches away from trunks and stems. Do not pile mulch against the bark. Avoid heavy fertilization on stressed evergreens unless a soil test or arborist recommendation supports it. Fertilizer does not replace missing foliage and can add stress when water is limited.
Wait before making final cosmetic cuts. Scratch small twigs lightly or bend branch tips to confirm what is alive. Prune clearly dead sections, but understand the limits: arborvitae, juniper, cedar, pine, and spruce often will not refill bare old wood. If the plant’s structure is permanently open, replacement may be the cleaner long-term decision.
The Bottom Line
The best way to get rid of bagworms is to match the method to the season. From fall through early spring, remove and destroy old bags. In late May and June, monitor closely for tiny moving bags and treat small feeding larvae with Bt or another labeled product. If larvae are larger but still feeding, spinosad or a properly labeled residual insecticide may help. By late summer, focus on hand-removal, plant recovery, and next year’s prevention instead of expecting sprays to fix mature bags.
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Frequently Asked Questions
What month should I spray for bagworms?
In much of the U.S., the best spray window is late May through June, after eggs hatch and while larvae are still small and feeding. Timing varies by region, so inspect for tiny moving bags instead of spraying by calendar alone.
Can I just pick bagworms off by hand?
Yes. Handpicking is very effective from fall through early spring before eggs hatch. Remove the bags and destroy them or soak them in soapy water. Do not drop intact bags on the ground.
Will arborvitae grow back after bagworm damage?
Light damage may recover, but large brown bare sections often do not fill back in. Arborvitae and many other evergreens do not reliably regrow from old brown wood.
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The usual reasons are poor timing, large mature larvae, incomplete coverage, rain too soon after application, or using a product not labeled for the plant and pest. Sprays work best on small feeding larvae.
How much does professional bagworm treatment cost?
Small shrub treatments may be similar to one-time pest-control visits, often around $100 to $400. Tall trees, dense hedges, repeat visits, and bucket or ladder access can push the cost into several hundred dollars or more.
Do I need a permit to remove a tree damaged by bagworms?
Possibly. Permit rules vary by city and may apply to protected trees, street trees, large trees, or trees in regulated areas. Check your local tree-removal rules before scheduling removal.
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