Issue 3, May 19, 2014

Emerald Ash Borer Emergence Approaching

Historically, as we approach the Memorial Day weekend, we begin to be aware of the possibility of emerald ash borer (EAB) emergence.  Emerald ash borer emergence is predicted to begin when the accumulation of degree days reach 450—500. As noted in the table above, several areas of the state have reached or are closing in on that threshold.

Scott Schirmer, EAB Program Manager with the Illinois Department of Agriculture shares the following: "It's been a slow progressing growing season so far, but we are finally approaching EAB emergence here in Illinois. The southern half of the state may be observing some initial EAB emergence at this time, but the northern half of the state may see it in a couple weeks. Municipalities and residents are urged to keep a close eye on their ash trees this spring and observe their condition. It's the ideal time of year to assess the tree's condition and make a determination on whether or not treatment is an option if the tree is looking healthy, or to opt for removal if it is not developing as it should be. Illinois residents are also urged to be aware of the EAB trapping and detection efforts underway once again. Folks may see traps in communities, parks, golf courses, campgrounds, and State Parks, among other locations. Residents are also encouraged to report suspect ash trees to the Department of Agriculture, U of I (extension), or their local municipality."

As Scott noted, residents are asked to stay alert, and look for potential signs of EAB. While peak emergence (and activity) is still quite a way off (accumulation of 1000 degree days), it is possible to note potential infestations at the apparent health of the ash tree, presence of D-shaped, and of course the confirmation of the borer itself. (Kelly Estes)

Kelly Estes

Return to table of contents