I believe my 100 yr old lilac has borer. I understand that the treatment requires hiring a technician with a license to use the required toxic chemicals. I am a senior and concerned about the cost, although I really don’t want to lose the bush. Can you give me some idea of what such a treatment costs?
Toronto Master Gardeners is unable to provide cost estimates on plant care services. A licensed tree and shrub care service will generally provide a free written estimate. You can find a qualified firm in your area, by using the search tool at the Tree Care Industry Association https://www.tcia.org/TCIA/Directories/FindQualifiedTreeCare.aspx?Country=Canada&State=ON&Accreditation=0