Oak-wilt timing guide
When Can TCCP Work Be Completed on an Oak Tree?
For the 2026 program, London defers work on oak trees to November through March. That program condition is distinct from a blanket municipal pruning prohibition.
Do not schedule routine TCCP oak work
London’s program defers oak work outside this period. CFIA also advises Canadians not to prune oaks between April and November.
Program work window
Approved TCCP work on oaks is scheduled during these months, subject to the Offer of Award and arborist availability.
Why timing matters
Fresh pruning wounds can attract beetles that spread oak wilt
Oak wilt is caused by Bretziella fagacearum. Red oaks are particularly susceptible, and the disease can spread through root grafts or beetles carrying fungal spores.
For suspected infection, sudden upper-crown browning or early leaf drop, contact the Canadian Food Inspection Agency and a qualified arborist rather than treating the tree as a normal pruning job.
Planning sequence
- 1Inspect and measure
Confirm species, approximate DBH and the problem being addressed.
- 2Obtain a qualified quote
Keep the assessment and quote within the City’s six-month guideline.
- 3Apply before work
Wait for the City’s decision and Offer of Award.
- 4Schedule within the window
Complete approved oak work between November and March.
Primary sources
Check the official rules
Program decisions are made by the City of London. These sources were reviewed on July 29, 2026.