emerald ash borer

Asked January 24, 2014, 11:23 AM EST

I live in central Denver and have 3 green ash and 1 autumn purple ash. Is there a treatment which is effective in protecting my trees from ash borer? If YES,
a. when should I begin treatment?
b.is the treatment effective if my neighbors do not treat their trees?
c.how long must I treat my trees? Thank you

Denver County Colorado

2 Responses

Hi there -

Currently we are recommending to preventively treat ash trees if you are within 5 -15 miles of an infestation site. EAB has been found in Boulder, but so far is not known to occur in Denver, so we are recommending to not treat ash trees in Denver at the present moment. For more info, visit www.emeraldashborer.info
Here is a link to treatment options for when/if the time comes:
http://www.emeraldashborer.info/files/Multistate_EAB_Insecticide_Fact_Sheet.pdf
Each tree needs to be treated individually in the spring on an annual or biannual basis for the rest of its life depending on what treatment you employ, even if neighboring trees are not treated.

Thank you.