Emerald Ash Borer Infestations & Treatments

Causes of Emerald Ash Borer Infestations in Iowa

The Emerald Ash Borer is a metallic wood-boring beetle. This beetle normally serves to kill weakened or dying trees as part of natures recycling scheme, however for an undetermined reason this beetle will feed on vigorously growing or weakened Ash trees, it does not discriminate.

The Emerald Ash Borer creates tunnels by feeding larvae and thus destroys the water and nutrient conducting tissues under the bark; this effectively starves the Ash tree. The canopy of heavily infested trees will begin to die, usually near the top and progressing downward. Many times, infested Ash trees produce epicormic (“water”) sprouts or suckers on the trunk or lower branches.

Epicormic sprouts are a result of the lack of water/nutrient uptake. The Ash tree is trying to feed itself by maximizing photosynthesis. Adult feeding (removal of tissue along leaflet edges) can be seen on affected Ash trees. The bark may crack directly over larval galleries. Adult beetles chew characteristic “D”-shaped exit holes as they leave former feeding sites below the bark.

Woodpeckers often are found on infested Ash tree trunks, feeding on larvae; this is most often noted during winter. Unless treated by your local certified ornamental applicator or arborist, Ash Trees attacked by the Emerald Ash Borer will die within 1-3 years. The Tree Doctor treats Emerald Ash Borer and we are the only local and privately owned company that has the newest technology in an injection gun. We will determine the DBH (diameter @ breast height) of your Ash tree; using that we will be able to determine the number of injections sites and mL of TREE-Age to inject into the tree. The Tree Doctor uses the only product on the market 99% effective in preventing, curing and eliminating the threat of Emerald Ash Borer infestation

Symptoms of Emerald Ash Borer

  • “D-shaped” exit holes on trunk ~ 1/8 inch diameter
  • “S” shaped serpentine galleries underneath bark
  • Suckering from base of trunk
  • 3-5 inch vertical cracks or splits in bark
  • Canopy dieback
  • Heavy woodpecker activity or damage

Emerald Ash Borer Control & Treatments

  • Biannual trunk injection of TREE-äge (Emamectin Benzoate)
  • Movement of the following items are prohibited out of EAB quarantined counties (Iowa included)
  • Firewood from hardwood trees
  • Entire Ash trees
  • Ash limbs and branches
  • Ash logs or untreated ash lumber with bark attached
  • Uncomposted ash chips and uncomposted ash bark chips greater than 1 inch in two of three dimensions