Friday, June 26, 2015
This week's blog post features a guest contributer; Jake Balmes, Certified Arborist and Street Supervisor for the Village of Gurnee, IL, has provided some information the increasing effect the Emerald Ash Borer on ash trees in the Midwest. Our Wachtel Certified Arborists have been able to use this information to help better prepare for the effects of the Emerald Ash Borer as it moves further into Wisconsin.
Contact our Wachtel Certified Arborists today for more information on the Emerald Ash Borer in Wisconsin.
Emerald Ash Borer (EAB) Learning’s from the South
Jake Balmes Street Division Village of Gurnee, IL Supervisor ISA Certification # IL-1331
The Village of Gurnee, IL had approximately 3,400 ash trees growing in the parkway system (this number is rapidly falling). We discovered EAB in January of 2011 and began treatments in June of that year.
In 2011 we treated 607 trees and intended to treat more trees in 2011; but had a violent windstorm and spent six weeks on cleanup efforts.
In 2012 we treated 2,072 trees and considered the costs associated with the available treatments and chose TreeAge.
-studies showed it to be more effective
-longer control period 2 yrs
We were very selective in 2011 with our treatment criteria and our results were very good. We lost none of the treated trees to EAB in the following years. In 2012 we loosened the criteria to treat more trees in an attempt to slow the losses in our community. This way we could keep pace with removals and replacement planting.
There is continued decline in many of these trees (I don't have hard numbers on this yet but we are tracking it) which supports the idea 15-20% crown thinning should be the threshold for "successful" treatment of infested trees. This also demonstrates the importance of not waiting until an active infestation has been identified to begin treatments.
In one growing season, our community went from having no visible signs of EAB to widespread ash decline in every neighborhood. We suspect EAB had been present for some time. The signs of this pest are incredibly subtle until it is almost too late.
Thank you for the opportunity to share with your clients what is happening just south of the border.