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In progress City project

2021 LDD (Gypsy Moth) Management Program

Information about this year's management of Lymantria dispar dispar (LDD), also known as gypsy moth, and what residents can do to protect trees on their private property.

Treatment overview

  • 272 trees received TreeAzin injections
  • 132 trees received ground sprays of BTK

You can also use our Interactive Treatment Map, to learn more about treatment locations.

Treatment areas

This year LDD management will be conducted in select parks and along select streets in Wards 1, 2, 3, 5, 6, 7, 8 and 9 where monitoring has indicated specific areas with a higher population of LDD and the potential for impacts to the city’s urban forest canopy. Elsewhere in the city, monitoring data show that the population of LDD is forecasted to remain at low levels in 2021.

Given the targeted nature of the LDD treatment this year, no specific safety measures are required on the behalf of residents this year. However, if you come in proximity of City staff or contractors, please maintain a physical distance of at least 2 metres (or 6 feet) for your safety and theirs.

Only publicly owned trees will be treated through the City’s LDD (Gypsy Moth) Management program. Forestry staff recommend that residents in areas where LDD are present take some preventative measures to manage LDD on their property.

Frequently asked questions

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

Stay connected

Sign up to receive news alerts on invasive species and tree pest management from the City’s Forestry team.

For more information on tree pests, email or call 311 (905-615-4311 outside city limits).

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