Invasive box tree moth found in Delaware: Immediate action required

DOVER, DE – The U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (USDA-APHIS) has confirmed the presence of the box tree moth (Cydalima perspectalis) in a private residence in Kent County, Delaware.

The box tree moth is a serious pest that primarily affects boxwood species, popular evergreen ornamental shrubs. If left unchecked, this pest can cause serious damage and even kill the plants. The discovery in Delaware is surprising, as it comes long after previous discoveries in states such as New York, Michigan, Ohio and Massachusetts.

“The box tree moth is an unexpected discovery in Delaware because it is so far from the only known discoveries in the United States,” said Jessica Munski, plant industry manager for the Delaware Department of Agriculture. “We are working closely with the USDA and the University of Delaware Extension to map the infestation. Only one property in Kent County has a confirmed infestation and control measures have been implemented.”

Why the box tree moth poses a threat

The box tree moth can spread naturally, traveling 5 to 10 kilometers annually and can fly up to 32 kilometers. The caterpillars are particularly destructive and can defoliate a plant in ten days. They are initially light green with black stripes and white spots and later form an extensive web on the plant. In severe cases they can defoliate the plant and then feed on the bark, ultimately killing the plant.

Adult moths typically have white wings with a thick brown border and are most active at night, making them difficult to spot. They can sometimes be confused with the melonworm moth.

How to detect and report an infestation

Delaware residents can help prevent the spread of this invasive pest by monitoring their boxwood trees for signs of damage such as brown or skeletonized leaves, leaf loss, and caterpillar webs.

If you suspect an infestation, contact the Delaware Cooperative Extension Master Gardeners at the Garden Helpline:

• New Castle County: 302-831-8862
• Kent County: 302-730-4000
• Sussex County: 302-831-3389

Residents should allow agricultural authorities to inspect their boxwood plants and set up search traps if necessary.

Preventive and control measures

To control the spread of the box tree moth, Delaware residents should remove infested plant branches. In severe infestations, it may be necessary to cut the plant off at the base; the plant should regrow from the roots. All debris should be double-bagged in plastic bags and disposed of in the trash. Homeowners are advised to follow Delaware Cooperative Extension pesticide recommendations.

Nursery owners should also monitor their boxwoods and take protective measures to limit pest risk. Any detections should be reported to the Delaware Department of Agriculture at [email protected].

The rapid response to this discovery is designed to protect Delaware’s landscape from the destructive potential of the box tree moth. By taking immediate action, residents can help protect their yards and the environment.

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