Box Tree Moth
The box tree moth is a serious threat to boxwood plants in Canada. Although it doesn't harm humans, it can devastate boxwood shrubs, which are vital for Canada's nursery trade and landscapes. The moth spreads mainly through infested shrubs' movement and can fly short distances each year.
Image from the Government of Canada Website
Initially found in Ontario, it has now been confirmed in other provinces like Quebec, Nova Scotia, and New Brunswick. Signs of infestation include damaged leaves, larvae, webbing, and debris. Monitoring and control involve inspecting boxwoods regularly, removing and destroying moth stages, and using biological pesticides for larvae.
Image from the Government of Canada Website
You can use a spray containing Bacillus thuringiensis subsp. kurstaki (Btk) on boxwood plants when you spot the black-headed green caterpillars. Btk works by targeting and killing caterpillars that have ingested leaves treated with it. For best results, apply the spray on days with no expected rainfall for at least 24 hours.
At Shades of Green, we carry BTK and can also provide a spraying service. Please contact our team if you require our services, BTK can be purchased in store or online.
