The Invasive Box Tree Moth

The invasive box tree moth (Cydalima perspectalis) has become a significant concern for Owen Tree and its 100’s of Oakland County homeowners who have boxwood shrubs in their landscape. This past summer we have seen quite a few boxwood shrubs damaged in the Farmington, Farmington Hills and West Bloomfield areas.
 
Originally from East Asia, this pest has established itself in several counties across southeastern and central Michigan, prompting the Michigan Department of Agriculture and Rural Development (MDARD) to implement a quarantine.

As of December 2023, the quarantine covers 12 counties: Clinton, Eaton, Ingham, Jackson, Lenawee, Livingston, Macomb, Monroe, Oakland, St. Clair, Washtenaw, and Wayne. This measure restricts the movement of boxwood plants and plant parts outside the quarantined area to prevent further spread of the moth.
The box tree moth's life cycle in Michigan is still being studied, but it's expected to have two to three generations per year in the Oakland County area. The caterpillars, which can be green and yellow with white, yellow, and black stripes, feed voraciously on boxwood leaves and bark, potentially leading to plant death.

Homeowners within the quarantine zone should be vigilant and avoid moving any boxwood material outside the area. Those outside the box tree moth quarantine zone should still monitor their boxwood plants for signs of infestation, such as damaged leaves, loose webbing, or the presence of caterpillars on their boxwood shrubs.

If you suspect a box tree moth infestation, it's crucial to report it to Owen Tree. Early detection and reporting can help contain the spread of this invasive species and protect Michigan's boxwood plants.
As Owen Tree moves into 2025, MDARD and other agencies continue to monitor and trap for box tree moths across the state. By staying informed and taking appropriate action, Michigan residents can play a vital role in managing this invasive pest and preserving our local ecosystems.