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Etiology of Bull's Eye Rot of Pear Caused by Neofabraea spp. in Oregon, Washington, and California

October 2004 , Volume 88 , Number  10
Pages  1,134 - 1,138

Jose L. Henriquez and David Sugar , Oregon State University Southern Oregon Research and Extension Center, Medford 97502 ; and Robert A. Spotts , Mid-Columbia Agricultural Research and Extension Center, Hood River, OR 97031

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Accepted for publication 5 June 2004.

A collection of Neofabraea isolates from pear fruit grown in Oregon, Washington, and California was screened with species-specific primers in a multiplex polymerase chain reaction (PCR). Neofabraea alba was identified most frequently in samples from Oregon and California, whereas N. perennans was found most frequently in samples from Washington. N. alba also was identified from tissue of small cankers and pruning stubs on pear trees using PCR. Bull's eye rot pathogens were isolated from fruit of nine different European pear cultivars, Asian pear, and quince. Overall, N. alba was the most prevalent species in 2001 whereas N. perennans was more prevalent in 2002. An undescribed species of Neofabraea was identified in samples from Medford, OR that corresponds to a species previously found by others using molecular methods. This information increases the known geographic distribution of this undescribed species.

Additional keywords: canker diseases, Pyrus communis

© 2004 The American Phytopathological Society