Box Tree Moth: What You Need to Know and What We Recommend
Share
Box Tree Moth in Ohio: What to Look For, What to Do Now, and What We Recommend
If you have boxwood in your landscape, now is the time to start checking it. Box Tree Moth has made its way to Ohio, and heavy infestations can severely damage or even kill boxwood plants. At Berns, we want to help you know what to look for, when to act, and how to make smart planting decisions moving forward.
Start checking now
Inspect your boxwoods now and continue checking weekly, especially new growth and interior foliage.
Look inside the plant
Early feeding can be hidden in the inner canopy, so part the branches instead of only viewing the outside.
Do not spray preventatively
Preventative applications are not recommended. Treat only when caterpillars or active feeding damage are clearly present.
Get help if needed
If you are unsure what you are seeing, bring photos to Berns and our team can help you decide whether treatment is warranted.
How to spot Box Tree Moth
Box Tree Moth damage is often easiest to catch early when you know exactly what to look for. Ohio State’s detection guide points homeowners to the caterpillars themselves, unusual chewing patterns, light silk webbing, and droppings in or under the plant.
Signs to look for
Caterpillars
Green to greenish-yellow caterpillars with black stripes, black dots, and a black head.
Leaf damage
Chewed leaves, browned foliage, skeletonized damage, or strange curled leaf remnants inside the canopy.
Webbing
Wispy silk inside the plant, often trapping debris and droppings.
Frass
Small green to greenish-brown droppings in the foliage or underneath the shrub.
Why regular inspection matters
Light infestations can be easy to miss at first. According to Ohio State’s detection material, early feeding often occurs on inner foliage, which means a plant may still look normal from the outside while damage is already building inside.
In heavier infestations, plants can brown quickly and severe defoliation can weaken or kill boxwoods over time.
Important: don’t spray “just in case”
Ohio State’s homeowner guidance is clear: preventative insecticide applications are not recommended. The better approach is to monitor, confirm active pests or damage, and treat only when needed.
When to treat
Recommended homeowner approach
Begin checking now. Look closely at both outer and inner foliage. If you find striped caterpillars or fresh chewing damage, that is the time to treat.
After treatment, continue monitoring so you can catch any new activity early.
Skip preventative spraying
Preventative spraying is not the recommended path. Unnecessary applications waste time and product and move attention away from the real solution: regular inspection and timely treatment only when there is something to treat.
Recommended treatment options
If treatment is needed, Berns carries two homeowner-friendly options that match the products highlighted in the current post and align with OSU Extension’s homeowner guidance.
Captain Jack’s BT
A homeowner option based on Bacillus thuringiensis that targets caterpillars. OSU Extension’s homeowner insecticide list includes Btk products among the treatment tools for Box Tree Moth caterpillars.
Shop Captain Jack’s BTCaptain Jack’s Deadbug Brew
Contains spinosad, another homeowner treatment option listed in OSU Extension’s guidance for Box Tree Moth caterpillars.
Shop Captain Jack’s Deadbug BrewThe Ohio State Extension resources
Part 1: Range and Spread
Explains where Box Tree Moth has been found, how it spreads, and why it matters for boxwoods in Ohio.
ReadPart 2: Detection
A visual guide to identifying caterpillars, chewing damage, silk webbing, and frass.
ReadPart 3: What Should You Do?
Homeowner guidance on monitoring, treatment timing, and avoiding preventative spraying.
ReadOur current stance on boxwood
Out of responsibility to our customers and the landscapes we help build, Berns is no longer recommending boxwood for most new plantings. We may still carry a limited supply for specific design situations, but we want customers to have the full picture before they plant.
Looking for a better long-term option?
If you want evergreen structure without the same level of concern, shop Berns’ recommended boxwood alternatives. Our team has curated options that deliver form, beauty, and more peace of mind.
Shop Recommended AlternativesBox Tree Moth FAQ
Should I spray my boxwoods now just in case?
No. Preventative spraying is not recommended. Start checking now and treat only if caterpillars or fresh feeding damage are present.
What are the easiest signs to spot?
Look for striped caterpillars, chewed or browned leaves, light silk webbing, and frass in or under the plant.
What part of the shrub should I inspect?
Check the inside of the canopy, not just the outer shell. Early feeding can be hidden on interior foliage.
What can homeowners use if treatment is needed?
Ohio State’s homeowner guidance includes Btk and spinosad among the treatment options for Box Tree Moth caterpillars.
Can damaged boxwoods recover?
Some can recover, especially when infestations are caught early. Heavy or repeated defoliation can weaken or kill plants over time.
Berns is committed to practical, research-backed horticulture. Need help identifying damage or deciding whether treatment is necessary? Stop in and talk with us.