Invasive Moth Caterpillars Defoliating Cincinnati Boxwoods

Box tree moth larvae are rapidly stripping leaves from hedges, prompting calls for early detection and treatment.

Apr. 4, 2026 at 4:07pm

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Across Greater Cincinnati, an invasive pest called the box tree moth is chewing through boxwoods from the inside, leaving behind webbing and rapid defoliation that can turn a decade-old hedge into a bare frame in a matter of weeks. Local horticulture professionals say the best shot at saving many boxwoods is to catch the problem early and follow a targeted treatment plan.

Why it matters

The box tree moth was first confirmed in the region in 2023 and has since spread to multiple Ohio counties, triggering new restrictions to slow the insect's movement. Untreated infestations can quickly kill off valuable boxwood hedges, prompting homeowners and landscapers to act fast to protect their greenery.

The details

Young box tree moth caterpillars are lime-green with dark stripes and tend to hide deep inside the shrub, making them easy to miss. They also spin protective webbing that can conceal heavy infestations. In warm weather, the insect can produce multiple generations in a single season, so populations can build rapidly if not detected early. After repeated defoliation, the insects may strip bark as well, which can kill boxwoods that were otherwise healthy.

  • The box tree moth was first confirmed near Loveland in June 2023.
  • Pupation and adult moth flights often start in April and May in this region.
  • Experts recommend beginning weekly checks in late spring, with mid-May as a baseline for regular monitoring.

The players

Ohio Department of Agriculture

Plant-health teams have been setting traps and surveying landscapes, while asking residents to report anything that looks suspicious.

OSU Extension

Provides detailed fact sheets and county-level maps on the box tree moth situation for homeowners and landscapers.

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What’s next

Plant-health teams are asking residents to report any suspected box tree moth infestations so inspectors can map and contain outbreaks.

The takeaway

This invasive pest poses a serious threat to boxwood hedges across the Cincinnati region, requiring vigilant monitoring and prompt treatment to save valuable greenery before it's too late.