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First report of Rhizoctonia oryzae causing crown and root rot on wheat (Triticum aestivum) crops in Chile.

Doussoulin, H. ; Cárcamo, T. ; Arismendi, N. ; Moya-Elizondo, E.

Plant Disease 2016 Vol 100 No. 7 pp. 1500;

Abstract

During the growing season of 2013/14, a survey in two wheat fields in the Araucanía Region (Chile) revealed an undocumented Rhizoctonia pathogen, which caused stunting, crown and root necrosis, and a sharp "spear tip" at the end of the infected roots. Fifty isolates of this Rhizoctonia sp. were obtained from 10-mm segments of the first internode (2.6% of incidence), which were transferred onto potato dextrose agar plates. Based on morphological characteristics, molecular data (amplification of the ITS and 18S rRNA genes) and pathogenicity, the causal agent was identified as R. oryzae. This fungus has been described to cause crown and root rot, damping off, stunting on tillers, reducing the number and length of roots, and reducing crop yield in the USA. This is thought to be the first report of R. oryzae causing disease in Chilean wheat crops.