Parks, Forestry & Recreation
Toronto, the largest city in Canada has an urban forest with an estimated 10.2 million trees covering approximately 18,000 hectares. Forty percent of this valuable resource is situated on public property, including an estimated 3.5 million trees within our parkland system and approximately 600,000 trees on our streets. Learn about Toronto's urban forest
Urban Forestry staff observed a significant loss of leaves in several forested locations across the City. Defoliation is caused by a caterpillar of a native insect, fall cankerworm.
In the late fall, wingless female cankerworm moths will crawl up the tree trunks to lay eggs in the tree crowns. In the following weeks, Urban Forestry staff will be banding trees in affected areas to prevent the moths from reaching the tree crown.
Consider protecting your trees if they were infested by fall cankerworm. This video provides detailed instructions on how to do it. The traps should be installed in mid to late October and removed by mid-December.
Urban Forestry implemented the 2017 Gypsy Moth control programme. It included two aerial spray applications in selected areas on May 23 and May 27th.
The City will be assessing the success of the programme by monitoring the gypsy moth population and the extent of defoliation during the growing season.