Phytophthoraspp. Associated with Appalachian Oak Forests and Waterways in Pennsylvania, withP.abietivoraas a Pathogen of Five Native Woody Plant Species

• DOI: 10.1094/pdis-05-21-0976-re
• Publication Date: 2021-11-17T06:37:37Z
• Authors: Devin Bily; Ekaterina Nikolaeva; Tracey Olson; Seogchan Kang
• Keywords: Phytophthora cinnamomi; Tsuga; Ornamental plant; Native plant

To document the distribution of potentially harmful Phytophthora spp. within Pennsylvania, Pennsylvania Department Agriculture collected 89 plant, 137 soil, and 48 water samples from 64 forested sites during 2018 to 2020. In total, 231 strains were isolated using baiting assays identified based on morphological characteristics sequences nuclear mitochondrial loci. Twenty-one in nine clades one unidentified species present. Phytophthoraabietivora, a recently described clade 7a species, was recovered diseased tissue 10 native broadleaved plants twice soil 12 locations. P. abietivora is most likely endemic pathogenicity tests six plant intraspecific genetic diversity, wide distribution, recoveries Abies Mill. Tsuga Carrière plantations dating back 1989. Cardinal temperatures traits are provided for this species. Other taxa, decreasing order frequency, include chlamydospora, plurivora, pini, cinnamomi, xcambivora, irrigata, gonapodyides, cactorum, pseudosyringae, hydropathica, stricta, xstagnum, caryae, intercalaris, 'bitahaiensis', heveae, citrophthora, macilentosa, cryptogea, riparia. Twelve associated with tissues. This survey documented 53 new plant-Phytophthora associations expanded known some