Recent research shows that the beetle can have a one-, two-, or even three-year life cycle. Adults emerged in mid to late May with peak emergence in late June. Females laid their eggs about 2 weeks after emergence. Eggs hatched in 1-2 weeks, and the tiny larvae then bore through the bark and into the cambium – the area between the bark and wood where nutrient levels are high.
Although difficult to see, the adult beetles leave a "D"-shaped exit hole in the bark, roughly 1/8 inch in diameter, when they emerged in June. The adult beetle is dark metallic green in color, 1/2 inch-long and 1/8 inch wide.
Other signs that your ask trees are infested with EAB include a thinning canopy. The canopy of infested trees begins to thin above infested portions of the trunk and major branches because the borer destroys the water and nutrient conducting tissues under the bark. Heavily infested trees exhibit canopy die-back usually starting at the top of the tree. One-third to one-half of the branches may die in one year. Most of the canopy will be dead within 2 years of when symptoms are first observed.
Sometimes ash trees push out sprouts from the trunk after the upper portions of the tree dies.
If you have noticed the 'D' shaped holes in the bark and/or a thinning canopy, you need to have a certified arborist come out to evaluate your trees, the severity of the infestation, if you have one, and the proper action plan to not only eliminate EAB, but also prevent it from spreading.
If you are local in the Chicagoland area, Trees "R" Us, Inc. through its plant health care division offers analysis of your trees by a certified arborist. With the analysis is a complete treatment or prevention plan with various ways to keep your plants and trees healthy. Trees "R" Us, Inc. has 4 certified arborists on staff so you'll never have to wait long for your tree analysis. To schedule a visit by one of our certified arborists, contact us via the web or phone at www.treesrusinc.com or 847-913-9069.