Heather from Sudbury Ontario writes
Permethrin SFR 36.8% can be used around the perimeter and edges of the patio to kill those that contact a treated surface but there is not a true repellent that could be used to keep them away. Since sawyer beetles bore into dead or dying trees you should inspect trees, especially conifers, for any damage and have those infested cut down and the wood chipped or burned to eliminate areas that can draw them in.
Answer last updated on: 07/17/2018
