Ohio Implements Quarantine in Southwest Ohio for Invasive Box Tree Moth

By Andi Anderson

The Ohio Department of Agriculture (ODA) has taken proactive measures to safeguard boxwood plantings and the horticulture industry. Effective April 11, 2024, ODA has implemented a quarantine in six counties of southwest Ohio to prevent the further spread of this destructive insect.

The counties affected by the quarantine include Butler, Clermont, Hamilton, Greene, Montgomery, and Warren. Residents and landscapers in these areas are urged to adhere to the regulations outlined by ODA, which restrict the movement of boxwood shrubs out of the designated quarantine zone. It is essential for individuals within the quarantine area to familiarize themselves with the boundaries and refrain from transporting boxwood plants beyond these limits.

The box tree moth, originating from East Asia, was first detected in Ohio near the border of Hamilton and Clermont counties in June 2023. Since then, additional sightings have been confirmed in the aforementioned quarantined counties. Recognized as an invasive pest, the box tree moth poses a significant threat to boxwood plantings, which are integral to Ohio's nursery stock economy and the horticulture industry as a whole.

To aid in the detection and monitoring of box tree moth populations, ODA, in collaboration with the United States Department of Agriculture, will conduct inspections and deploy traps throughout the affected regions. Residents are encouraged to remain vigilant and report any suspected sightings of the box tree moth using ODA's reporting tool.

Identifying characteristics of the box tree moth include green and yellow striped caterpillars and nocturnal adults with white wings bordered by brown irregular markings. Signs of infestation on boxwood shrubs may include chewed or missing leaves, yellowing foliage, white webbing, and the presence of green-black excrement.

For landscape professionals, nurseries, and individuals in the green industry seeking guidance or clarification regarding the new regulations, the Plant Pest Control Section of ODA can be contacted at 614-728-6400.

It is imperative for residents to remain vigilant and promptly report any sightings or signs of infestation to ODA's Division of Plant Health. By working together, Ohioans can help mitigate the threat posed by the invasive box tree moth and protect the state's valuable horticultural resources.

Photo Credit: ohio-department-of-agriculture