Emerald Ash Borer (EAB)
Emerald ash borer (EAB) is an invasive wood-boring insect that was introduced into North America from China and eastern Asia. EAB attacks and kills healthy and stressed ash trees. All ash species are susceptible in varying degrees. EAB was recently detected in Winnipeg. Once detected, it cannot be eradicated.
Long-term, it is recommended the City of Winnipeg use the "Slow Ash Mortality," or SLAM, approach to EAB management which is the approach being applied in most Canadian cities dealing with EAB. A percentage of eligible ash trees on public properties will be injected with an approved pesticide to preserve them as long as possible. The remaining ash trees on public properties will be removed as they die and possibly replaced over time.
Over the next year, the City will be focusing on a survey to determine the current extent of the infestation, creation of a temporary Supervisor of Forestry Technical Services position to plan and implement our EAB response, removal and disposal of infested ash trees growing on public property, treatment of some public ash trees, expanded EAB monitoring, and public awareness and education. For more information about the City’s Emerald Ash Borer Emergency Response Plan for 2018, please see the Emerald Ash Borer Preparedness, Response and Management Options report.
Emerald Ash Borer Regulated Areas Expanded to include City of Winnipeg
To slow the spread of emerald ash borer into new parts of Canada, the Canadian Food Inspection Agency (CFIA) has updated its regulated areas for emerald ash borer (EAB) to include the City of Winnipeg. Effective immediately, the movement of ash materials, including logs, branches, woodchips, ash nursery stock/trees, and all species of firewood out of Winnipeg is restricted. Because emerald ash borer can spread across long distances, the public plays a key role in helping to control the spread of emerald ash borer by not moving potentially infested materials. For more information, please see the CFIA website.
The goal is to spread out the mortality of ash trees over time to allow more proactive management of tree removals and replacements, and to preserve our healthy ash trees for as long as possible.
For more information about hiring an arborist, please visit the Trees Winnipeg website. Trees Winnipeg also provides support to property owners for tree planting on private properties through the Winnipeg ReLeaf Program.
- hire a qualified, licensed and insured professional arborist to remove their affected ash trees and chip them on site,
- take their ash tree material directly to Brady Road Resource Management Facility (without leaving the Regulated Area) for disposal, or
- burn ash material on site (outdoor burning requires a burn permit).
Please note that no untreated ash material can leave the Regulated Area/City of Winnipeg - this includes ash logs, branches, woodchips, nursery stock/trees, and all species of firewood. For more information about transportation of ash material or firewood outside the Regulated Area visit the CFIA website.
- creating a public tree inventory and private ash tree inventory,
- initiating discussion within industry including working with the nursery industry to increase the diversity of nursery stock,
- educating and training staff and industry,
- monitoring for EAB in partnership with Trees Winnipeg and CFIA using green sticky prism traps,
- establishing diversity guidelines for the City's reforestation program and new developments,
- partnering with the Province of Manitoba and CFIA to develop a Manitoba EAB Preparedness Plan, and
- removing ash species from its reforestation program.
- Don't move firewood,
- Burn firewood where you buy it,
- Plant a variety of tree species to increase diversity,
- Learn how to identify an ash tree, and
- Learn how to identify the signs and symptoms of EAB.
- D-shaped exit holes in the bark,
- excessive wood pecker feeding.
- foliar feeding by the adult beetles during the summer, creating irregular notches in the leaves,
- "S"-shaped larval tunnels underneath the bark (cannot be readily seen on the exterior of the tree),
- presence of larvae underneath the bark, and
- bark splitting where larval tunnels occur underneath the bark.
Trees infested with EAB may not show symptoms for two to four years upon initial infestation. Symptoms include:
- general decline and dieback in the tree crown, and
- suckering of shoots on the trunk of the tree.
- Record the location of the tree,
- Record the signs and symptoms you observed,
- Collect an adult specimen (beetle), keep it in a container in a freezer to preserve it, and
- Contact 311 or contact the Canadian Food Inspection Agency or call the Emerald Ash Borer hotline at 1-866-463-6017.
More detailed information on EAB is available on the following websites:
- Canadian Food Inspection Agency - Emerald Ash Borer
- Emerald Ash Borer Information Network
- US Forest Service - Forest Health Protection - Emerald Ash Borer
Canadian Forest Service (CFS) has also released a publication entitled "A Visual Guide to Detecting Emerald Ash Borer Damage." This publication is available at no charge by calling CFS, Great Lakes Forestry Centre at 705-949-9461. It can also be ordered online from the CFS website and is available in English or French.