I just got some great pictures from one of great Extension Agents, Mark Danieley, this week
Sawdust accumulated around the base of an infested ash tree. Photo: Mark Danieley
of some pretty messed up ash trees in a parking lot. They have sawdust (frass) accumulated on the ground around their trunks and in clumps on the bark. Of course the first thought was whether the tree was infested with emerald ash borer. Mark noted however that the holes were round not D-shaped. Turns out the trees are infested with banded ash clearwing larvae. As the larvae feed they periodically shove frass out of their galleries to keep them clear. This time of year the larvae are getting very big and thus feeding heavily. Adults will emerge soon. Thus, the holes in the pictures are from last year when adults emerged front he same trees. That is why they did not have characteristic pupal casings sticking out of the holes.
Sawdust in clumps and round exit holes on tree bark. Photo: Mark Danieley
I added a webpage just to post information about emerald ash borer. I will add to it as more information become available.
The ultimate source for EAB information is the website EmeraldAshBorer.info which is a collaborative effort of the USDA Forest Service, Michigan State University, Purdue University and Ohio State University.
Emerald ash borer has the potential to kill all ash trees in infested areas. You can read the
Emerald ash borer found in Granville County
original press release for quarantine information. I will post soon about management options. Generally though, as EAB spreads municipalities should plan on losing all ash trees that they cannot afford to treat each year.