Planting new green ash trees is no longer recommended given the susceptibility of this tree to the emerald ash borer. Grayish bark on mature trees separates into irregular plates.  A typical female can live around six weeks and lay approximately 40–70 eggs, but females that live longer can lay up to 200 eggs. Eastern U.S. Detailed Assessment for the Blue Ash (Fraxinus quadrangulata) in Point Pelee National Park of Canada. This species can be identified year-round. Abstract AN ANALYSIS OF BLUE ASH (FRAXINUS QUADRANGULATA) REGENERATION IN SOUTHEASTERN MICHIGAN IN THE PRESENCE OF EMERALD ASH BORER (AGRILUS PLANIPENNIS) by BENJAMIN A. SPEI May 2016 Advisor: Dr. Daniel M. Kashian Major: Biological Sciences Degree: Master of Science Since the introduction of the invasive bark beetle emerald ash borer (EAB) (Agrilus … Kentucky Extension specialists suggest selecting uncommon species to replace removed ashes in the landscape. Ash leaves are usually pinnately compound and appear opposite on the stem. Outside its native range, it is an invasive species and is highly destructive to ash trees native to Europe and North America. Although studies of American ashes have suggested that they are capable of mustering similar defensive mechanisms, the trees do not appear to recognize when they are under attack. Emerald ash borer will typically kill an ash tree within 3-5 years after infestation.  Excluding Spathius galinae, which has only recently been released, the other three species have been documented parasitizing emerald ash borer larvae one year after release, indicating that they survived the winter, but establishment varied among species and locations. Blue ash, a Midwest native, is often found growing in limestone outcrops. Threatened and Endangered Information: ... IN-Emerald Ash Borer Information (Purdue) (FRQU) MI-Recommended Alternatives to Ash Trees (FRQU) MI-Southeast Michigan RC (FRQU) The lilac borer is the main pest problem with blue ash.  Emerald ash borer has four larval instars. Four species of ash can be found in Onondaga County, white ash (Fraxinus americana), green ash (Fraxinus pennsylvanica), black ash (Fraxinus nigra) and blue ash (Fraxinus quadrangulata).  In eastern Europe, a population was found in Moscow, Russia, in 2003. Local governments in North America are attempting to control it by monitoring its spread, diversifying tree species, insecticides, and biological control. 8 pp. Agrilus ... Fraxinus quadrangulata Blue ash ? Poland, T. M., and D. G. McCullough. Moderate Fraxinus angustifolia Narrow-leafed ash Yes Eurasia Yes  In Europe, Fraxinus excelsior is the main ash species colonized.  It primarily spreads through flight or by transportation of ash bark containing products such as firewood or nursery stock, which allows it to reach new areas and create satellite populations outside of the main infestation. , The beetle is invasive in North America where it has a core population in Michigan and surrounding states and provinces.  Quarantines can limit the transport of ash trees and products, but economic impacts are especially high for urban and residential areas because of treatment or removal costs and decreased land value from dying trees. University of Kentucky scientists suggest choosing monotypic species such as the pawpaw, yellowwood, Franklin tree, Kentucky coffeetree, Osage orange, sourwood, and baldcypress. Blue ash (Fraxinus quadrangulata) is one of these less preferred hosts of EAB. Ashes that grow in pure stands, whether naturally occurring or in landscaping, are more prone to attack than isolated trees or ones located in mixed forest stands. 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