Victoria in Port Hope, ON., asks: How do I eradicate rose slug sawflies? Each year they devastate my roses, and this year they added mountain ash to their menu. I try to keep up by picking them off daily, and I spray with the appropriate bug spray. Even so, I cannot keep up. The mountain ash is now a skeleton, except for a few of the lower branches! Judith Adam, horticultural … [Read more...] about How to eradicate rose slug sawflies?