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Invasive Pests are Threatening Manitoba’s Trees

Posted: April 26, 2019


Invasive Pests are Threatening Manitoba’s Trees

Trees are a valuable source of shade during Manitoba’s hot summers.  Not only that, but trees help reduce pollutants and dust in the air, reduce run-off during rain storms, and provide recreational opportunities. Manitoba’s trees are threatened by invasive forest pests like the emerald ash borer (EAB), which was recently discovered in Winnipeg.  These are diseases and insects that are not native to Manitoba and can be highly destructive, because the natural controls from their native habitats are not present here.

While Dutch elm disease (DED), an invasive fungal disease, has already had a considerable impact on Manitoba’s elms, emerald ash borer (EAB) and cottony ash psyllid (CAP) threaten to destroy our ash trees. Other invasive diseases and insects are on our doorstep and threaten Manitoba’s bur oak, pine and maple tree populations.

Winnipeg is now regulated by the Canadian Food Inspection Agency for EAB meaning that firewood of all species, raw ash logs and material, and ash nursery stock cannot be taken out of Winnipeg and moved to other areas without written permission from the CFIA. Also note that the transport and storage of elm in Manitoba is prohibited by provincial law.


While DED has been successfully managed in many areas, EAB is proving to be much more difficult to control.  The key to defending Manitoba’s trees from this invader is prevention and early detection. 

The Manitoba Government has designated the last full week of April to be Invasive Species Awareness Week. Do Your Part:

  • Do not move firewood over distances, purchase your firewood locally,
  • and burn it where you buy it. 
  • Don’t bring ash and elm wood to our provincial parks. 
  • Familiarize yourself with the signs and symptoms of EAB, and report any suspicious trees to the Provincial Tree Line: 204-945-7866.

To learn more, visit:

www.manitoba. ca/stopthespread