02339naa a2200349 a 450000100080000000500110000800800410001902200140006002400360007410000210011024501060013126000090023752013700024665000180161665000160163465000220165065000190167265000120169165000220170365000190172565000090174470000170175370000200177070000260179070000220181670000200183870000220185870000190188070000140189970000200191377300560193320833072018-05-02       2018    bl uuuu     u00u1 u    #d  a1943-76927 a10.1094/PDIS-05-17-0721-RE2DOI1 aBLANCO, A. J. V.  aDiversity and pathogenicity of rhizoctonia species from the brazilian cerrado.h[electronic resource]  c2018  aEighty-one Rhizoctonia-like isolates were identified based on morphology and nuclei-staining methods from natural and agricultural soils of the Cerrado (Brazilian Savanna). The nucleotide similarity analysis of ITS1-5.8S-ITS2 regions identified 14 different taxa, with 39.5% of isolates assigned to Waitea circinata (zeae, oryzae and circinata varieties), while 37.0% belonged to Thanatephorus cucumeris Anastomosis Groups (AG) AG1-IB, AG1-ID, AG1-IE, AG4-HGI and AG4-HGIII. Ceratobasidium spp. AG-A, AG-F, AG-Fa, AG-P and AG-R comprised 23.5%. Rhizoctonia zeae (19.8%), R. solani, AG1-IE (18.6%), and binucleate Rhizoctonia AG-A (8.6%) were the most frequent anamorphic states found. Root rot severity caused by the different taxa varied from low to high on common beans, and tended to be low to average in maize. Twenty-two isolates were pathogenic to both hosts, suggesting difficulties in managing Rhizoctonia root rots with crop rotation. These results suggest that cropping history affects the geographical arrangement of AGs, with a prevalence of AG1 in the tropical zone from central to north Brazil while the AG4 group was most prevalent from the central the subtropical south. Waitea circinata var. zeae was predominant in soils under maize production. To our knowledge, this is the first report on the occurrence of W. circinata var. circinata in Brazil.  aCerrado soils  aRhizoctonia  aSpecies diversity  aBiodiversidade  aCerrado  aDoença de planta  aPatogenicidade  aSolo1 aCOSTA, M. O.1 aSILVA, R. do N.1 aALBUQUERQUE, F. S. de1 aMELO, A. T. de O.1 aLOPES, F. A. C.1 aSTEINDORFF, A. S.1 aBARBOSA, E. T.1 aULHOA, C.1 aLOBO JUNIOR, M.  tPlant Diseasegv. 102, n. 4, p. 773-781, Apr. 2018.