Emerald Ash Borer

What is Emerald Ash Borer and how can it damage your trees?

Emerald Ash Borer (EAB) infests and kills North American ash species including green, white, black and blue ash.

Adults emerge in late May through August. Females lay from 65 to 90 eggs which hatch in 7 to 10 days. Larvae chew through the bark and into the cambial region where they remain until pupation in May.

Adult beetles leave distinctive D-shaped exit holes in the outer bark of branches and the trunk. Adults are roughly 3/8 to 5/8 inch long with metallic green wing covers and a coppery red or purple abdomen. They may be present from late May through early September but are most common in June and July.

The Emerald Ash Borer does not show preference to stressed vs. unstressed trees. It attacks all varieties of Ash including green, white, and black. It attacks all sizes of Ash trees often starting to lay eggs in the branches where it is feeding on the canopy.

Damage is caused by the larvae, which feed in tunnels (called galleries) in the phloem just below the bark. The serpentine galleries disrupt water and nutrient transport, causing branches, and eventually the entire tree, to die.

Infestation is difficult to detect until dieback of canopy begins. Branches will die once they are girdled by theserpentine tunnels losing 30-50% of the canopy in year one and killing the entire tree in the second or third year. For treatment to be effective, it needs to take place in year one or as a preventative application.

When you consider the cost of removing and replacing an infected tree, the cost of prevention through treatment is significantly less. The cost to treat an average size tree is $65-$70.

Call Valley Green at 320-259-5959 for an estimate and learn how easy it is to protect your trees from the Emerald Ash Borer.

Our Direct-Inject Treatment is Proven… and it Works!

Call Valley Green at 259-5959 your local EAB treatment provider
​Valley Green’s Direct-Inject approach prevents long-term wounding, and protects tree health and vitality. Injections are made through the bark only and no damage is done to the sapwood.

Direct-Injections place the chemical directly into the cambial zone where the tree can utilize the product and where the EAB larvae are feeding. One benefit of Direct-Inject over the old drilling methods is that the tree does not have to expend precious energy healing from drill wounds.Direct-Inject also uses less product per treatment lowering the treatment cost per tree.

Treatments requiring drilling permanently damage trees,reducing a tree’s ability to move store nutrients and provide entry points for pests and diseases.Valley Green’s treatment approach offers sustainable treatments year after year with no compartmentalization of the injected area.

Ash Tree Infested with EAB
Eric Rebek, Michigan State University

Healthy Ash Tree
Eric Rebek, Michigan State University