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oai:drum.lib.umd.edu:1903/163982021-01-11T17:21:42Zcom_1903_2266com_1903_1598com_1903_2col_1903_2797col_1903_3

Balci, Yilmaz Harris, Jordan Lee Digital Repository at the University of Maryland University of Maryland (College Park, Md.) Plant Science and Landscape Architecture (PSLA) 2015-06-25T05:30:44Z 2015-06-25T05:30:44Z 2014 https://doi.org/10.13016/M2KS5R http://hdl.handle.net/1903/16398 A survey of urban trees affected by bacterial leaf scorch caused by Xylella fastidiosa was conducted in the District of Columbia during 2012 and 2013. Disease occurred most frequently with Quercus palustris, Q. rubra, Ulmus americana, and Platanus occidentalis. Eight other symptomatic and five asymptomatic tree species were found infected. The bacterium was also detected on asymptomatic portion of seven tree species. The occurrence of crown dieback was found significantly associated with X. fastidiosa-infection on Q. palustris, Q. rubra, U. americana, and P. occidentalis. A multi-locus sequence typing analysis using 10 housekeeping loci for X. fastidiosa revealed five clonal strains among the urban trees. These strains were host specific, with only one clone being associated with members of the red oak family, American elm, American sycamore, and two clones being associated with mulberry. Long-term management strategies aimed at mitigating the occurrence of bacterial leaf scorch disease are discussed. en Epidemiology and population structure of Xylella fastidiosa, the causal agent of bacterial leaf scorch, among urban trees in the District of Columbia Thesis Plant pathology Genetics Plant sciences Epidemiology Evolution Latent Phytopathology Population Xylella open.access