By Andi Anderson
Michigan is facing an escalating issue with the box tree moth, an invasive pest that threatens boxwood shrubs. These shrubs, popular for their evergreen foliage and deer resistance, have been widely used in Michigan’s landscapes.
However, in 2021, the pest made its first appearance in New York and quickly spread to Michigan, leading to immediate action by the Michigan Department of Agriculture and Rural Development (MDARD).
To prevent further damage, MDARD imposed a quarantine in 13 counties in Southeast Michigan, up from 11 counties just two years ago. This quarantine includes Clinton, Lapeer, St. Clair, Eaton, and several other counties.
It mandates that all boxwood plants entering nurseries in these counties undergo insecticide treatments and inspections.
Andria McCubbin, a nursery and seed specialist with MDARD, explains that eradication is not an option due to the pest’s prolific nature and strong flight capabilities. The primary way the box tree moth spreads is through human movement, making it vital for people to be aware and proactive.
Michigan State University Extension is closely monitoring the situation and advises homeowners to handle infested plants carefully.
Caitlin Splawski, a greenhouse educator at MSU, suggests that heavily infested plants should be double-bagged and disposed of in municipal waste, not yard waste. Homeowners are also urged to report any infestations outside the quarantine zones.
The moth’s larvae feed aggressively on the leaves of boxwoods, causing noticeable defoliation. Homeowners should watch for brown leaves, leaf loss, caterpillar droppings, and webbing, particularly during the moth’s active feeding months from June through September.
If infestations are caught early, trimming and regrowing the affected plants can often control the pest. However, experts are still learning how to best combat this threat.
Photo Credit: gettyimages-ian-redding
Categories: Michigan, Rural Lifestyle, Farm Safety