Wed, July 23, 2008
Ash Borer Battle Downtown
The City of London undertakes a new project to protect the healthiest ash trees in the downtown..
The Amabile Choirs sing in Germany, the Czech Republic and Austria... Some downtown London ash trees -- the city's largest -- are getting the equivalent of a flu shot to help protect them against the deadly emerald ash borer.
Chemical injections around the base of 44 ash trees in the city's core are aimed at deterring infestations for two years. The injections have shown to be effective 80 per cent of the time.
"It's like a flu shot for trees," said Ivan Listar, the city's urban forester.
The trees -- which aren't infested -- are scattered around Victoria Park, Covent Garden Market, John Labatt Centre and the London Convention Centre.
The initiative -- called the Ecoject System -- will cost the city about $8,000, Listar said. It will expand into different areas of London in the future if more money becomes available, he said. London and Toronto are the only places in Ontario to use the system city-wide.
The ash borer was discovered in London last year, when the city first experimented with Ecoject on 300 trees. The metallic green-bronze bug can kill healthy trees in two or three years as the larvae create tunnels by feeding under tree bark, preventing the flow of nutrients.
The ash borer has been found in Lambton, Chatham-Kent, Elgin, Middlesex and Norfolk counties, and has killed 20 million ash trees in North America.
There are 150 ash trees in the city's core, but only the 44 in the best condition were chosen, Listar said.
The injections will start this week.
A plant health-care technician will drill a series of small holes around a tree trunk and attach plastic canisters holding a chemical, called TreeAzin.
The chemical will travel through the tree like water.
The process can take a few minutes to a few hours, depending on the tree's size.
Strathroy-based Arbortech Professional Tree Care will administer the injections.
SOME FACTS ON ASH BORER
Emerald ash borer is a wood-boring beetle native to China and eastern Asia.
It attacks all species of ash trees.
The bugs were found in Michigan in 2002 and have move eastward -- landing in London last year. Some infestations in London are near Masonville Place and Parkwood and University hospitals.
Larvae can kill a healthy ash tree in two to three years.
Adult beetles are 1-1.5 cm long with a metallic green-bronze body colour.