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Non-profit Tree Canada has donated 2.6 gal (10 L) of TreeAzin insecticide to provide injections to ash trees in a Gatineau, Que., park to help protect them from emerald ash borer (EAB).

The insecticide was donated to National Capital Commission (NCC), which runs the Lac Leamy Park. It will be used to treat about 40 trees (the greater its diameter, the more product is needed), which were chosen because they are still healthy enough to distribute the treatment. Holes will be drilled into the base of their trunks and a nozzle will be attached to inject the insecticide.

“The treatment is a systemic insecticide made from the Neem tree from India, which when injected directly into the base of tree, creates an undesirable host for insects (i.e. emerald ash borer),” Laura Banks, Tree Canada communications officer, told Canadian Groundskeeper. “The solution is transpired by the tree (root flare), moving upward as nutrients and water do, and the smell repels insects.”

The park contains about 70 per cent ash trees, according to Michael Rosen, Tree Canada president, meaning without proper measures, the insect could destroy the trees. Some signs indicating trees are infected include:

  • dead branches;
  • flaking bark; and
  • shoots around the tree base.

Injections are occurring now since the best time is when the leaves are fully expanded in July and August, said Banks. In addition to injecting trees with insecticide, the NCC is monitoring the situation and planting new trees.