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Battle against the ash borer: Saint-Laurent once again contracts a reputable supplier to treat ash trees on private properties

15 mars 2016

Saint-Laurent, March 15, 2016In an effort to consolidate the efforts deployed over the past three years by Saint-Laurent's administration and residents to eradicate the ash borer, an insect that has already destroyed millions of ash trees in North America, Saint-Laurent Council has mandated a reputable supplier to provide owners of properties with ash trees with a preventive treatment comprising the organic pesticide, TreeAzin.

“Saint-Laurent's administration has spared no effort to protect the approximately 2660 ash trees on public property across its territory,” the Mayor of Saint-Laurent, Alan DeSousa. “Its awareness initiatives among private owners and other communities and government entities have also resulted in projects that will be profitable over the long term. Accordingly, it is important to continue our fight against this ravaging insect. For the time being, prevention is our best strategy.”

Do you have an ash tree? Contact the Services des espaces verts company

Between April 1 and August 15, owners of ash trees in Saint-Laurent can call the Services des espaces verts company at 514-337-1060 or send them an email at to arrange preventive treatment against the ash borer. We recommend that the trees in question be treated as early as possible in the season.

Under the terms of the agreement negotiated between the company and Saint-Laurent, the cost to treat one tree before taxes is estimated based on the tree diameter at breast height, or at 1.4 metres from the ground:

DBH of 40 cm: $180

DBH of 50 cm: $222

DBH of 60 cm: $270

DBH of 70 cm: $315

Authorization certificate for tree-cutting

It is important to remember that to ensure its effectiveness, preventive treatment with TreeAzin must be repeated every two years between June 1 and August 31.  Furthermore, if a tree shows signs of decay, only an expert will be able to determine if the ash borer is to blame and if the damage can be reversed. An ash tree whereby 30% of the branches are suffering from decay are generally considered to be too far gone to be saved by treatments. In this case, an authorization certificate for tree-cutting must be obtained from the Borough without delay between October 15 and March 15 to prevent the ash borer from spreading. 

To learn more, visit the following sites:

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