Figure 1 — Symptoms of dry rot canker: localized, dry sunken lesions scattered over the root surface.
Introduction & Background In mid-September 2011, a field near Bridgeport, in Morrill County, Neb., was observed with numerous plants (10- 15%) exhibiting wilting and yellowing symptoms suggestive of Rhizoctonia root rot. However, root symptoms were characterized by localized, dry sunken lesions scattered over the root surface (Figure 1). The surface tissues of the cankers also produced a distinctive series of concentric circles (Figure 2), like a target board. These root symptoms are inconsistent with the well-known Rhizoctonia root and crown rot disease (RRCR), but are suggestive of the rarely occurring dry rot canker disease, also previously assumed to be caused by the soilborne pathogen Rhizoctonia.
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