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Its broad distribution across geographic regions and host taxa is accompanied by high genetic diversity. Historically, the\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>R. solani<\/jats:italic>\n                    <\/jats:styled-content>\n                    species complex has been classified into 14 anastomosis groups (AGs) based primarily on hyphal anastomosis compatibility. Despite being widely perceived as a generalist,\n                    <jats:italic>\n                      <jats:styled-content style=\"fixed-case\">R. solani<\/jats:styled-content>\n                      's\n                    <\/jats:italic>\n                    host range has not been studied in a comprehensive cross\u2010AG framework to evaluate global patterns of pathogen diversity and host associations. We analyzed a global dataset of 4119\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>R. solani<\/jats:italic>\n                    <\/jats:styled-content>\n                    rDNA\u2010ITS sequences collected over the past 70\u2009years, including newly sampled taxa from Nebraska, and used a smaller concatenated ITS and TEF\u20101\u03b1 dataset comprising 162\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>R. solani<\/jats:italic>\n                    <\/jats:styled-content>\n                    sequences to assess whether broad phylogenetic patterns were consistent across markers. Phylogenetic reconstruction suggests that most AGs formed well\u2010supported clades that largely corresponded to reported AG designations. Host family\u2010level transition inference suggests that generalist AGs may experience more transient host associations, while specialist lineages show stronger host\u2010associated genetic differentiation that contributes to the observed genetic structure. Our ancestral host\u2010state reconstruction analysis further suggests that the AG\u20103 lineage likely originated from an ancestor with a broader host range and subsequently became predominantly associated with Solanaceae, with no inferred reversal in the sampled dataset. These findings suggest that host association and host\u2010transition patterns are important features of the generalism\u2010specialization continuum and contribute to population structure in a globally distributed fungal pathogen.\n                  <\/jats:p>","DOI":"10.1002\/ece3.74254","type":"journal-article","created":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T08:38:08Z","timestamp":1788251888000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Global\u2010Scale Patterns of Host Transitions Suggest Contrasting Levels of Specialization Within\n                    <i>Rhizoctonia solani<\/i>"],"prefix":"10.1002","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-6660-4753","authenticated-orcid":false,"given":"Xin Zhi","family":"Khoo","sequence":"first","affiliation":[{"name":"Department of Ecology &amp; Evolutionary Biology University of California  Irvine California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6639-5410","authenticated-orcid":false,"given":"Robert M.","family":"Harveson","sequence":"additional","affiliation":[{"name":"Department of Plant Pathology University of Nebraska\u2010Lincoln  Lincoln Nebraska USA"},{"name":"Panhandle Research Extension Center University of Nebraska\u2010Lincoln  Scottsbluff Nebraska USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7567-4363","authenticated-orcid":false,"given":"Teddy","family":"Garcia\u2010Aroca","sequence":"additional","affiliation":[{"name":"Department of Plant Pathology University of Nebraska\u2010Lincoln  Lincoln Nebraska USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,1]]},"reference":[{"key":"e_1_2_12_2_1","doi-asserted-by":"publisher","DOI":"10.3390\/genes13122417"},{"key":"e_1_2_12_3_1","doi-asserted-by":"publisher","DOI":"10.3389\/fmicb.2022.1091288"},{"key":"e_1_2_12_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-2836(05)80360-2"},{"key":"e_1_2_12_5_1","first-page":"1","article-title":"Morphological and Molecular Data Reveal Cryptic Speciation in Lasiodiplodia theobromae","volume":"28","author":"Alves A.","year":"2008","journal-title":"Fungal Diversity"},{"key":"e_1_2_12_6_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.py.20.090182.001553"},{"key":"e_1_2_12_7_1","doi-asserted-by":"publisher","DOI":"10.1093\/oxfordjournals.molbev.a026036"},{"key":"e_1_2_12_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-3059.2009.02138.x"},{"key":"e_1_2_12_9_1","doi-asserted-by":"publisher","DOI":"10.1094\/PHYTO.2002.92.1.43"},{"key":"e_1_2_12_10_1","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2148-7-163"},{"key":"e_1_2_12_11_1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1020811019189"},{"key":"e_1_2_12_12_1","doi-asserted-by":"publisher","DOI":"10.1534\/genetics.105.041780"},{"key":"e_1_2_12_13_1","doi-asserted-by":"publisher","DOI":"10.1093\/molbev\/msz189"},{"key":"e_1_2_12_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0169-4758(97)01163-0"},{"key":"e_1_2_12_15_1","doi-asserted-by":"publisher","DOI":"10.1111\/nph.12150"},{"key":"e_1_2_12_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/0378-1119(93)90175-3"},{"key":"e_1_2_12_17_1","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2148-7-214"},{"key":"e_1_2_12_18_1","first-page":"121","article-title":"DGGE Coupled With Ribosomal DNA Gene Phylogenies Reveal Uncharacterized Fungal Phylotypes","volume":"23","author":"Duong L. 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