Gypsy Moth Update – 2016

In March, the City held an open house on the gypsy moth situation in our neighbourhood. As a whole, it appears that the number of egg masses has remained constant in trees being monitored by the City. It remains to be seen how this year’s mild winter affects the overall population.

On top of gypsy moth, there has also been some appearance of green inch worms which the City believes may be canker worms. This pest can also be very destructive to the oak trees. They tend to emerge a bit earlier than the gypsy moth caterpillars. The inch worms will also eat the tree canopy with smaller holes in the leaves of the trees.

The main affected areas in our community are bound by:

Lorne Park Road to the east; Camelford Road to the west (including the Bramsey loop); Truscott to the south; and Wembury to the north (extending to Indian Road in the east).

To help keep the gypsy moth/canker worm population in control, residents are encouraged to practice as many integrated pest management procedures as possible year after year to help.

What you can do:

All residents, especially those in neighbourhoods with a high density of oak trees, are encouraged to manage populations on their property by implementing the following pest management controls:

  •  picking caterpillars off foliage, tree trunks and branches and soaking them in soapy water to destroy them (May to July)
  •  placing sticky bands on tree trunks (May to July) – check local garden centres or Lee Valley
  •  installing burlap wraps around tree trunks and then collecting and destroying the caterpillars (May to September)
  •  using pheromone traps to capture and confuse male moths (June – August) – check local garden centres or Urban Nature Store
  •  scraping off and destroying egg masses (August – May)
  •  consult an arborist regarding Treeazin or AceCap which are synthetic insecticides drilled into the tree trunk.

A number of residents in the affected area noted above did have their trees injected last year with AceCap (the writer being one of them) and found that it helped immensely. The tree canopy was fuller and there was a significant reduction in worm droppings.

If you are considering injecting your trees with AceCap, please consult a certified arborist for cost. The injections would be carried out when the insects first appear and the buds are busting; typically sometime in May depending on the weather.

Listed below are recommendations from the City of Mississauga on various “pests” in our community. For more information, please visit:

Once in this link, click on “Pests & Disease Management” then “Tree Pests” and finally click on “Gypsy Moth.