Jeffrey Hahn, Asst. Extension Entomologist
By now, I am sure that everyone has heard about the confirmed emerald ash borer (eab) find in St. Paul on May 14 near Hampden Park (northeast of the intersection of I-94 and Highway 280). There are lot of questions being asked by homeowners about what to do, especially about insecticides.
First, if you are further than 10 to 15 miles from St. Paul, we do not suggest you treat your ash. Without being closer to known eab infestations, you are very likely just wasting money and insecticides.
But if you are within this 10 to 15 mile radius, treating your ash is a consideration. However, this issue is more complicated than just what product to use. There many factors to consider. There is a new fact sheet written by entomologists from Michigan, Ohio, Indiana, Wisconsin, and Illinois that discusses this topic in detail. You can find this publication on the Extension Emerald Ash Borer web page. Look under Resources and then under Management. This page also contains a lot of other important information concerning eab.
Photo 1: EAB galleries in infested tree in St. Paul. Jeff Hahn