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Arboriculture & Urban Forestry Online
Volume 44, Issue 3 — May 2018

Results and Implications Following a Twelve-Year Monitoring of Ash (Fraxinus spp.) Mortality Due to Agrilus planipennis in an Urban Forest Plantation

Sakthi Kumaran Subburayalu and Davis Sydnor

Abstract: Identifying ash genotypes that are resistant to emerald ash borer (Agrilus planipennis Fairmaire) (EAB) continues to be an effort of importance to widen the existing knowledge on interspecific variation in EAB-host preference, identify mechanisms involved in EAB infestation, and aid in development of EAB-resistant ash hybrids that could potentially serve as viable replacements in urban plantations. A research plantation composed of 17 cultivars and 2 seedlings of ash trees was established in Toledo, Ohio, U.S., to monitor the susceptibility of these trees to EAB. The tree mortality was recorded on an annual basis since 2005. The results from the study and its implications, at the end of 12 years of monitoring, are presented in this paper. The study reaffirmed what is known about the resistance of the Asian ash species Fraxinus mandshurica (‘Mancana’) and the general susceptibility of North American ashes to EAB. However, it was observed that the degree of susceptibility to EAB varied across the different cultivars, with white ash cultivars ‘Autumn Purple’ and ‘Rosehill’ showing higher survival rates. However, this conclusion is based on a low replication, and all but one individual of each cultivar were infested at the end of the study. The findings suggest a need for continued and thorough screening of ash cultivars for identifying resistant genotypes.


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