The Minneapolis Park board put on an Emerald Ash Borer workshop today at the newly discovered outbreak site at Ft Snelling Golf Course. Brian, Keith and I were in attendance. The outbreak was discovered by a city tree inspector sent to the park for a service request to remove a fallen tree. What he found there was undeniably an Emerald Ash Borer infestation in its 5th or 6th year. Many trees were severely damaged from top to bottom. The trees looked much worse than I thought possible. The Bark was falling off of them and they were covered in holes from woodpeckers searching for the larvae. This was a very eye opening event illustrating the seriousness of the Emerald Ash Borer problem in Minneapolis and in the surrounding area to come. It is estimated that we are in the 5th or 6th year of the Emerald Ash Borers arrival in the Twin Cities. Since there are no natural predators and Ash trees have no natural defense the population of Emerald Ash Borers will grow uncontrollably. It is estimated that by year 9 of an Emerald Ash Borer infestation there can be nearly 1 trillion insects. The population increases exponentially by a factor of 50 every year so by the 10th year there can be 50 trillion Emerald Ash Borers and so on. Fortunately for those interested in protecting their Ash trees we have treatment programs suitable for all Ash trees. For trees smaller than 15” diameter we recommend soil injection imidacloprid which provides 1 year protection. For trees larger than 15” diameter we recommend trunk injection Tree-Age which provides 2 years protection. If you have any questions please give us a call and have one of our ISA certified arborists look at your trees and determine the best treatment options for you. Here a several pictures from the workshop:

Girdled To The Base


White Ash Healing Wound


Bark Stripped Symptom of EAB


Brian Observing Ash Girdled


Closeup of EAB Larvae Galleries


EAB Infested Tree with Woodpecker Holes

EAB Girdled

More EAB Girdled


More Signs of Woodpecker Damage


EAB Larvae Gallery Closeup

White Ash EAB Wound

White Ash EAB Wound

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