Inspecting for Emerald Ash Borer: Learn the EAB Life Cycles

Emerald Ash Borer infestation - Stein Tree Service - 1000

Spring is here again, and Stein reminds residents that inspecting for emerald ash borer (EAB) is important for residents of Pennsylvania and Delaware if you have ash or fringetrees in your yard. A professional knows just what to look for, but homeowners should proactively inspect trees throughout the year for signs of illness or infestation.

Unsure what to look for? Well the signs of EAB could vary from season to season based on the emerald ash borer lifecycle, though once damage has occurred, you should be able to see the evidence. The emerald ash borer has three distinct life cycle phases. Stein Tree offers a look at the three seasonal phases.

Emerald Ash Borer Life Phases

Inspect for Emerald Ash Borer Lifecycle and History - Stein Tree Service Spring

Adults emerge from winter slumber in the spring about ½ an inch long. Their exit leaves D shaped holes in the bark of the tree. The adult beetles begin consuming the canopy leaves, which could begin to show signs of thinning.


During warm summer months, the emerald ash borer mates and lays eggs between the layers of outer bark and in crevices of the tree. The eggs hatch within about two weeks and the larvae begin tunneling through the bark to feed on the phloem, the tissue that conducts nutrients to all parts of the tree.


Fully grown larvae spend the winter wrapped in a pupation cell, before emerging as adults in spring. Younger larvae spend the winter months feeding in galleries within the tree. The galleries are one of the most destructive aspects of the emerald ash borer’s impact, and eventually lead to the tree’s death due to lack of ability to circulate nutrients and water.

The emerald ash borer has been devastating to the nation’s ash tree population. In order to protect our trees; we need to be aware of the signs, do regular inspections for infestation and general tree health, and take corrective measures when necessary. Certified arborists like those at Stein Tree Service are trained to know the signs, and we are certified to treat emerald ash borer.

Call Stein Tree Service for Emerald Ash Borer Treatment in Delaware and Pennsylvania

The treatment of emerald ash borer is regulated and companies must be certified to perform the treatment. Stein Tree Service is licensed for inspecting for emerald ash borer and providing appropriate treatment in Delaware and Pennsylvania. We are also certified to work in areas that are under spotted lanternfly quarantine. Our professional tree care specialists are passionate about helping trees thrive. Contact us today for information about our tree care services or to schedule a free consultation.