Box Tree Moth

The Box Tree Moth (Cydalima perspectalis) is a devastating invasive pest that threatens boxwood plants across West Bloomfield and Farmington. Originally native to Asia, specifically North China and Korea, this moth has rapidly spread to Europe and North America, causing significant damage to boxwood hedges and gardens.

Appearance and Lifecycle

Adult box tree moths are distinctive, typically featuring white wings with dark brown borders and a wingspan of about 4-5 cm. The moths lay eggs on boxwood leaves, which hatch into caterpillars within three days. These caterpillars are visually striking, with green bodies adorned with white, yellow, and black stripes.

Box Tree moth caterpillar. Photo: Dave Kidd, Owen Tree Service

Destructive Impact

The most critical threat posed by box tree moths is their voracious feeding behavior. Caterpillars consume boxwood leaves and stems, often stripping plants down to their midribs. In severe infestations, entire boxwood plantings can be decimated.

Detection and Control

Owen Tree or yourself can identify an infestation by looking for:
•    White webbing in shrub interiors
•    "Peeled" leaf appearances
•    Green-black caterpillar droppings
•    Brown or scorched-looking shrubs

Control methods include:
•    Pruning infested plant parts
•    Using pheromone traps
•    Applying biological control products like BT (Bacillus thuringiensis) as well as contact and systemic insecticides.

Importantly, box tree moths can survive extreme temperatures down to -22°F and produce multiple generations between May and October, making early detection crucial for managing their spread. Call Owen Tree and have one of our  Certified Arborists get you on a plan to protect you’re boxwoods investment today.