TORONTO’s ash trees, which make up 8.5% of the city’s tree canopy, are under attack from the Emerald Ash Borer beetle (EAB). Once the EAB is on an ash tree, its larvae use the tree as a feeding ground and restricts the tree’s nutrient flow, killing it within a few years.
Natural Resources Canada is breeding Tetrastichus planipennisi, a species of wasp native to China, to act as a predator of the beetle. Female wasps, once released, fly to the beetle-infested trees and lay their eggs on EAB larvae. Once they hatch, the wasp larvae will eat the EAB larvae and use their eggs as a home.
While the entire city of TORONTO is considered infested, there are still other cities like Winnipeg, Halifax, and Vancouver, that are anticipating the arrival of the EAB.
<IMAGE – Tess King/The Varsity> Read the entire article at http://thevarsity.ca/2017/04/03/torontos-forests-fight-back/