Trees and Ravines
In cities, trees play a key role in creating healthy urban environments. Many citizens see trees as an important measure of the quality of their communities. In North America and internationally, there is a growing body of research that supports the importance of maintaining healthy, sustainable urban forests.
The Canadian Food Inspection Agency (CFIA) issued a Ministerial Order on December 3, 2013, which identified a new Asian Long-horned Beetle (ALHB) infestation and Regulated Area located in Mississauga and Toronto.
A major responsibility of Urban Forestry Services is the maintenance of City owned trees, particularly trees that grow on the City road allowance and in parks.
Private trees are an important part of the urban forest nurtured and are protected by Urban Forestry. Trees on private property can be protected and regulated under the provisions of municipal by-laws.
Urban Forestry Services plants trees on City-owned street allowances fronting residential properties for free. Periodically, Urban Forestry Services will canvass neighbourhoods for tree planting opportunities.
An arborist is a professional with knowledge of tree biology and physiology, and experience in arboriculture - the cultivation, management and study of individual trees. Learn when and how to hire one.
Trees need water to survive. Water is used by trees to carry nutrients obtained from the soil throughout the tree. During periods of hot, dry weather there is often less moisture available in the soil.
Why do tree leaves change colour in the fall? Leaves change colour due to biochemical processes within them that are triggered by diminishing amounts of daylight, longer nights, and weather factors. Your questions are answered at Trees FAQ.
The Emerald Ash Borer (EAB) is an invasive insect pest that attacks and kills all species of ash trees. In 2007, the Canadian Food Inspection Agency confirmed presence of EAB in Toronto. Urban Forestry implemented a management plan to mitigate the impact of this introduced pest on our urban forest.
European Gypsy Moth is a serious threat to Toronto's urban forest. At outbreak levels, this invasive insect can cause severe defoliation of trees. Parts of the City of Toronto experienced outbreaks in 2007, 2008, and 2013. An Integrated Pest Management control program was implemented in these years to prevent significant canopy loss in the affected areas.
The Asian longhorned beetle (ALHB) which has devastated the tree canopies in parts of New York City and Chicago since the late 1990's was discovered September 2003 in parts of the city of Toronto and the city of Vaughan.
Dutch elm disease (DED) is caused by a fungus that attacks the water conducting vessels of the sapwood of elms. DED was introduced to Canada from Europe in 1944 and was first detected in Ontario in 1950.