Gypsy Moth Spray 2022

Since 2004, City staff have conducted defoliation and egg mass surveys in multiple areas of Toronto to curb the spread of the LDD Moth (Lymantria dispar dispar), formerly known as the European Gypsy Moth. This work is primarily conducted in areas with historic infestations, moderate-to-severe defoliation, and new areas where residents have reported moth sightings.

The LDD Moth is an invasive insect from Europe that can cause severe damage to most species of hardwood trees. Although some trees can withstand one to several years of severe defoliation by LDD moths, the intense loss of leaves or needles can result in heavy stress, making them more susceptible to harm from other insects, diseases, or weather fluctuations.

With 2021 survey data forecasting high LDD Moth populations in parts of Toronto for 2022, the City is preparing to implement several intervention measures, including TreeAzin injections, ground sprays, and aerial sprays. You can find out more about the City's 2022 LDD Moth Management Program – including spray areas and how you can help manage moth populations – here.