Emerald Ash Borer (EAB) is an invasive species of beetle which feeds exclusively on ash trees. The larvae burrow under the bark of ash trees and feed there, causing extensive damage which leads to the death of the tree within a few years.
Native to eastern Asia, EAB was first discovered in North America in 2002. In 2008, the Canadian Food Inspection Agency (CFIA) confirmed the presence of EAB in Brampton and neighbouring municipalities.
EAB poses no risk to humans or animals and does not harm other species of trees. It is, however, very deadly to all varieties of ash trees (except Mountain Ash, which is not a true ash).
Excerpt from City of Brampton website… Emerald Ash Borer
Also see Emerald Ash Borer on Wikipedia