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Insect Control

Elm Bark Beetle

Early stages of Dutch Elm Disease

What is a native elm bark beetle?

The native elm bark beetle is an insect that carries the fungus that causes Dutch Elm Disease in American elm trees in Winnipeg.

What does the elm bark beetle look like?

The adult beetle is small and cylindrical. The length of the beetle measures 2 to 3.5 millimetres. It is brownish black in colour and has short hairs over its body.

What is the life cycle of the beetle?

The beetle has one generation per year in Winnipeg. Most of the population spends the winter as an adult at the base of healthy elm trees. Adults emerge in the spring to feed on healthy elms and then fly to dead or dying trees to lay their eggs. The eggs hatch into larvae. By the fall, the larvae develop into adults and emerge. If the dead or dying tree has Dutch Elm Disease the beetle carries the fungus to a healthy tree and infects the healthy tree.

Helping your trees

Keep your trees healthy by watering and fertilizing. Prune dead or dying branches immediately. You can control the native elm bark beetle by contracting out tree care companies to spray chlorpyrifos on the lower 50 centimetres of your elm trees.

Tanglefoot banding is also an alternative in decreasing the overwintering success of the native elm bark beetle by preventing the adult beetles from migrating down the trunk of elms where they burrow into the bark on the lower trunk.To control the elm bark beetle, you must put your band on by late September and it should remain on the tree until the May long weekend.For information on how to band your tree, please refer to the tree banding section of the cankerworm page.

For Further information visit the Urban Forestry Web Page.


Last update: September 11, 2015
Contact Us
Bugline: 311
or 1-877-311-4WPG
Media inquiries: 204-986-6000
311@Winnipeg.ca

Administrative Office and Research Laboratory
1539 Waverley Street
Winnipeg MB R3T 4V7

Operations Base
3 Grey Street
Winnipeg MB R2L 1V2
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