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Plant Health
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In June, 2002, the emerald ash borer (EAB), Agrilus planipennis Fairmaire (Coleoptera: Buprestidae) was identified as the causal agent in ash tree decline and mortality in the Detroit metropolitan area. For several years before this identification, homeowners and arborists in southeast Michigan attributed the loss of their ash trees to “ash yellows”. The trees exhibited a top-down crown dieback, dense sprouting from trunks (epicormic shoots), and other signs of tree stress typical of ash yellows. The infested ash trees displayed dying crowns in the second year of infestation and most died from EAB within five years.
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