Treatment Of Infested Ash Trees
Trunk injection is the most effective management method and provides the fastest knockdown of existing Emerald Ash Borer infestations according to studies conducted at four universities. Adam’s trained specialist will inject an EPA-approved, systemic insecticide directly into the trunk of the infested ash tree(s). Trunk injection treatments are typically applied in spring, from mid-May to mid-June. The insecticide is distributed throughout the tree by means of its circulatory system.
Trunk injection treatments are most effective on trees with less than 20% dieback or thinning of their canopy. In many cases, the tree canopy will begin to improve in the second year of treatment giving the tree time to recover. Research indicates that it is probably too late to save trees that have lost more than 50% of their canopy.
An alternative to the injection method is to introduce the insecticide into the tree through its root system. Adam’s specially trained technician will apply EPA-approved, systematic insecticide to the soil; either pouring the solution into the ground within 2 feet of the base of the tree, or injecting the insecticide solution into holes made in the soil immediately adjacent to the base of the tree.
A number of studies indicate that for trees of less than 6'' Diameter Breast Height (DBH) a soil application every two years may be sufficient; otherwise, for high value trees or for larger trees, soil treatments should be done annually.
As with the trunk injection method, initial dieback of the tree is an important factor in determining potential for tree recovery. Soil treatments are most effective on trees with less than 20% dieback; and not practical on trees with over 50% dieback.