Two invasive insects deserve fresh attention in 2026: box tree moth and spotted lanternfly. Both have spread since this article was first published, and both can hitchhike through ordinary human activity. One moves mainly with boxwood plants and plant material. The other can travel on vehicles, trailers, outdoor equipment, firewood, and other hard surfaces.
The useful response is not panic or blanket spraying. It is good scouting, accurate identification, careful plant movement, and treatment only when it is actually needed. That matters for homeowners, landscapers, garden centers, nurseries, vineyards, and anyone moving plants or outdoor equipment through affected areas.
Box Tree Moth Quarantines Expanded Again in 2026
Box tree moth, Cydalima perspectalis, is an invasive moth whose caterpillars feed on boxwood. Heavy infestations can strip a shrub of leaves and then damage bark, leaving a plant badly weakened or dead.
The federal quarantine map continued changing in 2026. USDA APHIS expanded Ohio quarantine areas in August, added counties in Maryland and Pennsylvania, and established a federal quarantine in Cape May County, New Jersey after a confirmed 2026 detection there. The current USDA APHIS box tree moth page is the best place to check the latest regulated areas before moving boxwood across state lines.
That last point matters. Quarantine rules are not just for large nurseries. They can affect the interstate movement of boxwood plants, cuttings, clippings, debris, and other regulated material. Commercial growers in quarantined areas may need compliance agreements and state-issued certificates before shipping plants interstate.
What Box Tree Moth Damage Looks Like
Do not wait for a hedge to turn brown before looking closely. Early box tree moth damage can hide inside dense foliage.
- Chewed or skeletonized boxwood leaves.
- Silky webbing around leaves and branch tips.
- Green-black frass caught inside the shrub.
- Green caterpillars with dark head capsules and dark longitudinal striping.
- Rapid thinning or browning when larval numbers are high.
Scout more than the outside shell of the plant. Pull branches apart and look into the middle. Dense boxwood can hide feeding for quite a while before the damage is obvious from the driveway.
A Simple Boxwood Scouting Routine
During the active growing season, inspect boxwood on a regular schedule. Commercial growers already understand the value of records, but the same habit works in a home landscape. Note the date, plant location, damage level, insect stage, and anything you did in response.
That kind of routine is one reason modern greenhouse technology and IPM recordkeeping matter. A pest log does not need to be complicated. Consistent notes can tell us whether damage is spreading, whether a treatment worked, and when the next generation appears.
What to Do if You Find Suspected Box Tree Moth
If box tree moth is new to your area, photograph the caterpillar and damage and report the suspected find through your state agriculture department, plant regulatory office, or Cooperative Extension service. Early reports help officials understand where the pest is established.
For light infestations, removing heavily infested branches can reduce the population. USDA guidance says infested boxwood debris should be double-bagged in plastic and placed in the trash. Do not casually move infested clippings to another property or across a quarantine boundary.
Insecticides can be useful, especially when small caterpillars are actively feeding, but product choice and timing matter. Homeowners should use a product labeled for the site and pest and follow the label exactly. Local Extension recommendations are especially useful because permitted products and timing can differ by state and situation.
Healthy Boxwood Still Needs Good Horticulture
Good plant care will not prevent an invasive caterpillar from arriving, but it can help boxwood recover from stress. Avoid chronic drought stress, water the root zone deeply when needed, keep mulch off the trunk and crown, and do not push soft growth with excessive fertilizer.
Also remember that not every brown boxwood has box tree moth. Boxwood blight, Volutella, winter injury, root problems, drought, spider mites, and other issues can produce decline. Identification comes before treatment.
Spotted Lanternfly Is Now Reported in 19 States and Washington, D.C.
Spotted lanternfly, Lycorma delicatula, has continued expanding its U.S. range. USDA APHIS currently lists established populations in 19 states plus the District of Columbia. That includes states from the Mid-Atlantic and Northeast as well as expanding populations farther west and south.
This insect feeds on sap from many woody plants. Grapes are among the crops of greatest concern. Large populations can also gather on tree-of-heaven, maples, black walnut, and other hosts.
How to Recognize Spotted Lanternfly
The insect changes appearance through the season, which is one reason people miss it.
- Egg masses: gray or tan patches laid on bark, stone, metal, trailers, patio furniture, vehicles, and many other hard surfaces.
- Young nymphs: black with white spots.
- Older nymphs: red and black with white spots.
- Adults: gray forewings with black spots and bright red hindwings visible when the insect opens its wings.
Large feeding groups produce sugary honeydew. That sticky material can coat plants, decks, vehicles, and outdoor furniture and support the growth of dark sooty mold.
The Biggest Spotted Lanternfly Risk Is Movement
Spotted lanternfly is an excellent hitchhiker. Egg masses can be laid on objects that later travel hundreds of miles. That makes vehicle and equipment checks one of the most practical things the public can do.
Before leaving an infested or quarantined area, inspect trailers, campers, outdoor furniture, pallets, grills, wheel wells, recreational equipment, firewood, and anything stored outside. Rules vary by state, so check the current quarantine requirements where you live and where you are going.
Tree-of-Heaven Deserves Special Attention
Tree-of-heaven, Ailanthus altissima, is a favored host of spotted lanternfly and is itself invasive in much of the United States. Removing it can make sense, but cutting one down without a control plan often triggers aggressive root suckering.
Identify the tree correctly first, then use a control method recommended for your region. Once an invasive tree is removed, replacing it with a suitable native species can improve the landscape rather than simply leaving an empty space. Our guide to lawn-to-native landscaping covers the larger idea of replacing high-input or invasive plants with species that better support local landscapes.
Be Careful With Sticky Bands
Exposed sticky bands can trap birds, beneficial insects, bats, and other small wildlife. If trapping is part of your local management recommendation, use a wildlife-safe design such as a properly constructed circle trap or a guarded sticky band.
Trapping also does not replace scouting. A trap on one tree can tell us insects are present, but it does not protect an entire property by itself.
Do Not Turn an Invasive-Pest Alert Into a Pollinator Problem
Broad insecticide use can kill far more than the target pest. Before treating, identify the insect, confirm that the plant needs protection, choose a labeled product, and pay attention to flowering plants and pollinator activity.
That is especially important in yards designed to support butterflies and other beneficial insects. Our butterfly garden guide explains why pesticide-aware care matters when we are trying to protect both ornamental plants and the insects we actually want.
Grapevines Need More Attention Than Most Landscape Plants
Spotted lanternfly can be a nuisance on many trees, but vineyards face a more serious production risk. Heavy feeding can weaken grapevines, reduce vigor, create honeydew problems, and add another management cost to an already intensive crop.
Backyard grape growers should scout trunks, cordons, posts, nearby tree-of-heaven, and other vertical surfaces where insects congregate. Commercial vineyards should follow state Extension and regulatory guidance rather than relying on general homeowner advice.
Do Not Spray Every Lanternfly You See
A few adults on a mature shade tree do not always justify an insecticide treatment. In areas where spotted lanternfly is already established, complete eradication from one residential yard may be unrealistic.
Focus treatment where the insect is threatening valuable plants, where populations are heavy, or where state guidance recommends control. Mechanical killing, egg-mass removal, host management, and careful movement practices may be enough in lower-risk situations.
The 2026 Lesson: Check the Map Before You Move the Plant
The most important change since the original 2025 article is geographic. Box tree moth quarantines have expanded again, including new 2026 federal actions in Ohio, Maryland, Pennsylvania, and New Jersey. Spotted lanternfly is now listed by USDA in 19 states and Washington, D.C.
That means old screenshots and last year’s county lists are not enough. Before shipping boxwood, moving nursery stock, hauling landscaping debris, transporting firewood, or taking outdoor equipment across state lines, check the current state and federal rules.
Steady Scouting Beats Panic
Invasive pests are frustrating because the map can change faster than our habits. But the basic response stays simple. Know what the pest looks like. Inspect plants before damage gets severe. Report new finds. Follow quarantine rules. Avoid moving suspect material. Use pesticides only when they are justified and labeled for the job.
That approach protects more than one hedge or grapevine. It helps nurseries keep shipping legally, gives regulators better information, reduces accidental spread, and keeps us from solving one insect problem by creating three new ones.