ash borer prevention #207214 - Ask Extension


ash borer prevention #207214

Asked August 17, 2014, 5:53 PM EDT

In all the info we are getting for the ash borer that has started in Boulder, the reference to "consult an arborist to judge the health of their ash trees and decide whether they are worth treating with pesticides."  There is no reference to what pesticides should be used or the length of time these pesticides will help prevent the ash borer or if there is any preventive measures that can be taken.  All I have found is the identification fact sheet.  Is there one I am missing?

Jefferson County Colorado

Expert Response

The information about emerald ash borer and its treatment (including specific pesticides and timing of those) can be found in a couple of places.
The Colorado Department of Agriculture is the clearinghouse for all information on Emerald Ash borer in our state.  If you go to the website you'll find a lot of information.  The specific publication that discusses pesticides and their use can be found here:
Also check:
which is the Colorado State University Extension web site.  You'll find links to more information (including the publication mentioned above) and several videos, one of which shows how to assess your tree.
Because the insect has not yet been detected outside of Boulder, we are not recommending any pesticide treatments at this time for residents of Jefferson County. Once the insect has been located within a 5 mile radius of your property, then treatments can begin and they must continue yearly or every other year depending on the product selected. 

Mary Small Replied August 18, 2014, 12:27 PM EDT

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