Wasps and hornets are considered beneficial insects because they feed on a large number of insect pests. They are also scavengers, feeding on carcasses. Wasps and hornets nest in sheltered places such as hollows of trees, stumps, in the ground, or in constructed nests often suspended from the branches of trees, eaves, or other parts of buildings. These insects tolerate the human approach; however, they will attack if their nest is disturbed. Most nests made by these insects are placed high enough in trees to not threaten public safety. Nests situated in the tree higher than 3 m (approx 10 ft) are typically not removed. However, if the nests are within the public right-of-way and close enough to the ground to threaten public safety, Urban Forestry will inspect the site and decide on further action.
If a nest in a City-owned tree is causing a problem in the summer, you can request an inspection. Many people notice these nests in the fall when the leaves fall from the tree. Removal of the nest at this time is not necessary since the wasps, which remain in the nest, do not survive the winter season. Only the queens survive to overwinter in sheltered locations outside of the nest.
If you would like to report a concern about a bee, wasp, or hornet's nest in a City tree, between the months of July and September, you can submit a service request online at https://www.toronto.ca/home/311-toronto-at-your-service/create-a-service-request/ , or call 311.
Refer to the fact sheet and policy on nest removal.