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Emerald Ash Borer

Miles of Green works with and follows a program designed by a certified master arborist who has 99% success rates of saving ash trees in the greater Detroit and Chicago areas. The program that we follow at Miles of Green does not require drilling into the trees, but only requires removing a very small plug of bark to make an injection directly into the vascular system of the tree. The trunk injection is the first of the two step program. The second step is deep root fertilization a premium fertilizer, root stimulator, as well as some more insecticide to be taken up by the trees root system. The fertilizer is key to the program success because it keeps the ash trees healthy and as stress free as possible. Struggling or stressed ash trees release a chemical that the emerald ash borer is attracted to.


Miles of Green will gladly come out and give you a free ash tree analysis and estimate please call to set up an appointment.

For a list of signs and symptoms of EAB, click to view a resource and check out the descriptions below.

History & Facts

The Emerald Ash Borer (EAB) has killed millions of ash trees since its discovery in southeastern Michigan in 2002.  Native to Asia, this insect was probably introduced to the United States in wood packing material carried in on cargo ships or airplanes. Through a combination of natural spread and human activity it is now found in Michigan, Ohio, Indiana, Illinois, Missouri, Pennsylvania, Maryland, West Virginia, Virginia, Wisconsin, Kentucky, and now Minnesota, placing millions of additional ash trees at risk. It will continue to spread.

Adult beetles feed on leaves and it is uncertain what impact adult feeding has on tree health. Larvae, on the other hand, feed on the inner bark and disrupt the movement of water and minerals within a tree causing eventual dieback, decline, and death of the tree. Symptoms of early infestations may be difficult to diagnose. Be on the look-out for multiple declining ash in a given area. As infestation progresses, small vertical splits in the bark can be seen on twigs or trunk and woodpecker holes may be present on trees. Trees may die after 2-4 years or less (small trees).

Not sure if you have an ash tree? Click to use this guide


  • Symptoms of early infestations may be difficult to diagnose
  • As infestation progresses, small vertical splits in the bark can be seen on twigs or trunk
  • Typically the top 1/3 of crown dies first and works its way down the tree
  • Trees appear to lose about 30%-50% of their canopy after 2 years of infestation.
  • Trees will die after 2-4 years or less (small trees)
  • As the top of the tree continues to decline epicormic shoots form
  • Epicormic shoots can arise at the interface between healthy and dead tissue anywhere in the canopy
  • Be on the look-out for multiple declining ash in a given area
  • As infestation progresses, woodpecker holes may be present on trees
  • Distinct “S” shaped frass filled larval galleries that score the outer sapwood and phloem underneath the bark
  • Galleries in an affected area can range from 4-20 inches in length
  • Galleries from an individual larvae become progressively wider as the larvae grows
  • D-shaped exit holes (generally present after an infestation has been present for 1 yr. or more) Approximately 1/8 inch in diameter
  • Dense root sprouting may occur after death of a tree
  • Leaf symptoms from adult feeding is usually displayed in small irregular shaped patches along the leaf margins



  • Usually bronze or golden green with dark metallic emerald green wing covers
  • Adults are slender and can be 1/4 inch to 1/2 inch in length
  • Top of the abdomen under the wings is metallic purplish red (seen when wings are spread)
  • Adults may be difficult to detect even in areas of high infestation
  • Short period of activity (3-6 wks of activity)
  • Generally active during the day (sunny and warm days)
  • Adults will hang out in bark crevices or on foliage during rain, heavy cloud cover, high winds, or when temps reach above 90 F.
  • Adults can be found most years beginning from late May into Mid-August.  Peak Mid to Late June
  • EAB has distinct features, but it can be confused with the following beetles: Banded Ash Borer, Japanese Beetle, Six-Spotted Tiger Beetle, Bronze Birch Borer, Two-lined Chestnut Borer, Caterpillar Hunter


  • Slender, flattened, segmented (10 total abdomen segments) cream colored larvae with a brown head can be found by peeling back loose bark on infested trees
  • Larvae range in size from 1 -1 1/4 inches in length
  • Pincer-like appendage on the last segment
  • Larvae hatch from eggs deposited in bark crevices
  • Larvae chew through the bark and begin feeding on phloem
  • Feeding is completed in autumn and pre-pupal larvae over winter in the outer sapwood or bark.
  • Pupation begins in late April or May
  • Newly formed adults will often remain in pupal chamber for 1-2 wks prior to emergence in late May into Mid-August
  • Some larvae may require a second year of maturation feeding prior to emerging the following year as adults


  • Green Ash (Fraxinus pennsylvanica), White Ash (F. Americana), Black Ash (F. nigra) and Blue Ash (F.
  • quadrangulata) cultivated varieties.
  • Order of susceptibility: Green Ash, Black Ash, White Ash, Blue Ash
  • All will be attacked if beetle populations are high enough
  • Some evidence to suggest that green ash may be preferred over other species
  • EAB can infest ash trees as small as 1 DBH inch up to the largest specimen trees
  • Stress may contribute to the vulnerability and speed that a tree declines from EAB
  • EAB has also killed seemingly vigorous trees growing under optimum conditions (especially as beetle densities build)