![]() Movement of emerald ash borers and their host material has been, until recently, regulated by the USDA under a federal domestic quarantine. Spread throughout the country has been mainly by the movement of infested firewood, logs, chips, and nursery stock. Though harmless to people and other animals, it has proven deadly to all ash species in North America, including the native Oregon ash ( Fraxinus latifolia), naturally found west of the Cascades in southern British Columbia, Washington, Oregon, and northwestern California, as well as central California and the Sierra Nevada. (36 states and the District of Columbia). First detected in Michigan in 2002, it has spread through much of the U.S. The EAB is now considered to be the most destructive forest insect to ever invade North America. However, outside its native range it is extremely destructive to trees indigenous to North America or Europe. In its native range, this beetle is typically not found in high numbers and does not cause significant damage to native trees. Adults emerge in one to two years and typically travel only about a half mile afterwards. ![]() Eggs hatch in seven to ten days and larvae burrow through bark to living tissues where they feed, eventually cutting off the flow of water and nutrients, which causes a slow death. Adults feed on leaves and females lay their eggs in bark crevices. Of northeastern Asian origin, the EAB is a small green beetle in the Buprestidae family which feeds on members of the olive family (Oleaceae), especially ash trees ( Fraxinus species). The Oregon Department of Agriculture believes that the infestation has been in that county for at least three to five years. By now you’ve likely heard that identification of the dreaded emerald ash borer (EAB) has been confirmed in Washington County, Oregon. ![]()
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