Proudly serving Sarnia and Lambton County since 1996.
24/7 Emergency Service? Call us at (519) 337-9563
Contact us today for all your tree care needs.

Oak Wilt

What is it?

Oak wilt is a vascular disease of oak trees, caused by the fungus Ceratocystis fagacearum.  The fungus grows on the outer sapwood of oak trees restricting the flow of water and nutrients through the tree.

Signs & Symptoms

  • Leaves turn dull green, brown or yellow
  • Discoloration of leaves progressing from the edge of the leaf to the middle
  • Wilting and bronzing of foliage starting at top of the tree and moving downwards
  • Premature leaf fall (including green leaves)
  • White, grey, or black fungal mats just under the bark that emit a fruity smell
  • Vertical bark cracks in the trunk and large branches as a result of the fungal spore mats (also referred to as pressure pads) exerting outward pressure on the bark.

If you are concerned about your oak tree(s), please call Guardian Tree Systems Inc. for a free estimate @ 519-337-9563

City of Sarnia – Oak wilt warning

Seasonal mulch and wood chips available.
Call 519-337-9563 for more information.
Our office hours are
Mon to Thurs: 9a.m. - 4p.m. but we’re available by phone 24/7, 365 days a year.
T. 519-337-9563


1701 Michigan Line Sarnia,
ON N7T 7H4