European gypsy moth (EGM) is a defoliating insect that can severely weaken or kill trees. It is a major pest in North America.
In conjunction with various ground-based methods of control, the City of Toronto will be conducting an aerial spray this spring. The spray is to help manage high levels of European gypsy moth caterpillars that are expected in certain areas of the city and prevent severe canopy damage and tree loss. The spray dates are yet to be determined but are set to occur sometime between May 16 and June 15, 2019. The spray dates are dependent upon weather conditions at the time and insect/leaf development. View the Public Notice of Pesticide Use For The Control of Gypsy Moth regarding the aerial spray program and the map of the areas that will be affected by aerial spraying operations
City of Toronto Gypsy Moth Aerial Spray Presentation: