Tree pests and diseases

There are many different pests or diseases that can infest Calgary's urban forest. Some are beneficial to the trees, but many are not.

Common pests and diseases in trees

Invasive Threats to Calgary's urban forest

  • ​Dutch elm disease

    ​Dutch elm disease is a fungus spread in elm trees by the elm bark beetle. Alberta is DED-free and works diligently to stay that way.​​

  • Emerald ash borer

    Emerald ash borer is an invasive beetle that poses a threat to our ash trees if it arrives in Calgary. Currently there have been no detections in Alberta, but we continue to monitor for its presence.

​​​Learn more about common pests in Calgary​

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