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Completed in 2020 City project

2020 Gypsy Moth Management Program

Information about this year's Gypsy Moth Management Program and what residents can do to protect trees on their private property.


Monitoring data from 2018 and 2019 indicate that the 2018 aerial spray program was effective in reducing Gypsy Moth populations in treated areas of the City. These areas are now considered to be low risk for defoliation in 2020.

In lieu of holding public open houses this year, Forestry staff have prepared the following video to inform residents about this year’s Gypsy Moth Management Program and what actions residents can take on their private property to reduce the population of Gypsy Moth in Mississauga.

Treatment areas

This year’s management will focus on areas in Mississauga that are considered higher risk for defoliation. A variety of management strategies will be implemented for trees in certain City parks and along certain streets including tree injections, ground sprays, egg mass scraping, burlapping and pheromone traps. Not all methods will be conducted in each treatment area.

Portions of Wards 3, 4, 5, 7, 8 and 9 have been identified to receive treatment in 2020 and are depicted on the following maps. Street trees in these areas will be treated with injections only. Park trees will be treated with a combination of injections (Mississauga Valley Park, Paul Coffey Park and Sugar Maple Woods) and ground sprays (Applewood Hills Park, Garnetwood Park and Huron Park).

  • Ward 3 (including Applewood Hills Park and Garnetwood Park)
  • Ward 4 (Mississauga Valley Park)
  • Ward 5 (Paul Coffey Park)
  • Ward 7 (including Huron Park)
  • Ward 8
  • Ward 9 (Sugar Maple Woods).

Not all trees on the indicated streets will be treated, nor will all trees in indicated parks. Only trees that have been identified to be at high risk of defoliation in 2020 will receive treatment.

Treatment timing is dependent on a number of ecological factors (for example leaf size, caterpillar size, and weather) but is anticipated to occur during the month of May.

Where can I find updates on when work is taking place?

Updates on timing will be posted frequently to this page during the month of May. Residents are encouraged to sign up for news alerts by joining our Tree Pest Management mailing list, by following us on social media (Facebook, Twitter and Instagram).

Frequently asked questions

We have prepared an FAQ Document to answer some common questions that residents may have.

What residents can do

The City needs the help of residents to control the Gypsy Moth population in Mississauga. If residents, especially those in neighbourhoods with a high number of oak trees, use IPM techniques on their own property, working together, we can keep Gypsy Moth numbers at a manageable level.

Here are some recommended Integrated Pest Management techniques that you can use on your property:

  • May to July: Pick caterpillars off leaves, tree trunks and branches and soak them in soapy water to destroy them.
  • May to September, Burlapping: Install burlap wraps around tree trunks and then collect and destroy caterpillars and pupae.
  • June to August, Pheromone Traps: Use pheromone traps to catch and confuse male Moths.
  • August to May, Gypsy Moth Egg Mass Search: Scrape off and destroy egg masses.

Contact an Arborist if you have concerns about trees on your property.

Please call your local nursery or garden supply store for availability of the materials listed above.

Stay connected

Sign up to receive news alerts on Tree Pest Management from the City’s Forestry team.

For more information on Gypsy Moths, email or call 311 (905-615-4311 outside City limits).


The City has made a series of videos to help demonstrate some of the Integrated Pest Management techniques mentioned above.

Scraping Gypsy Moth egg masses off trees

Burlapping trees

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