A fast-spreading invasive species has arrived in Metro Detroit.
The Box Tree Moth Caterpillar is causing damage to boxwood plants across the region, according to English Gardens.
The family-owned Metro Detroit business urges homeowners to inspect their landscapes and take action if signs of infestation appear.
What to look out for
English Gardens said early detection is key to saving plants. Here’s what to look for:
- Stripped bark and chewed leaf debris
- White webbing between branches
- Pale yellow eggs on the undersides of leaves
- Green or yellow caterpillars with black heads (some may have dark stripes)
- Adult moths with white wings bordered in dark brown
Treatment plan
If you suspect an infestation, the business recommends doing the following:
Take photos of the damage and pests
You can bring the photos to the Garden Pharmacy at English Gardens for identification and help with a plan of action.
Remove caterpillars and prune damaged areas
Handpick caterpillars and remove heavily infested stems and leaves. Throw away the debris in sealed bags. Do not compost it.
Apply Bacillus thuringiensis (BT)
According to English Gardens, BT is an organic treatment that is safe for pollinators, yet deadly to caterpillars. It’s recommended to reapply every seven to 10 days as needed during the active feeding cycle.
Support plant recovery
After the infestation is under control, English Gardens recommends applying Turbo Grow to help strengthen the boxwood and promote healthy regrowth.