Rhizoctonia Root Rot (Bare Patch)

another rhizoctonia patch in winter wheat

Rhizoctonia patch in winter wheat

Rhizoctonia root rot of wheatRhizoctonia root rot of green pea

Wheat and pea roots rotted by Rhizoctonia solani AG-8

Rhizoctonia root rot of spring wheat

Rhizoctonia patches in spring wheat

Rhizoctonia root rot of spring wheat

Rhizoctonia patches in spring wheat

Rhizoctonia root rot of spring barley

Rhizoctonia patches in spring barley

Rhizoctonia root rot of spring barley

Rhizoctonia patches in spring barley

Rhizoctonia root rot of spring canola

Rhizoctonia patches in spring canola

 

Rhizoctonia root rot of green pea

Rhizoctonia patches in green pea

 

Rhizoctonia Root Rot

Rhizoctonia root rot is one of the most important diseases delaying adoption of biologically and economically sustainable conservation tillage systems in the Pacific Northwest. Emphasis has been placed on developing management practices that minimize economic risk from this disease. Such practices include seed treatment, fertilizer placement, timing of planting, resistant varieties, weed management during non-crop periods, selection of the style of seed drill, and others. Collaborators include scientists in Washington, Idaho and Oregon. Representative papers include the following.

  • Pumphrey, F.V., D.E. Wilkins , D.C. Hane, and R.W. Smiley. 1987. Influence of tillage and nitrogen fertilizer on Rhizoctonia root rot of winter wheat. Plant Disease 71:125-127.
  • Smiley, R.W., and D.E. Wilkins. 1993. Annual spring barley growth, yield and root rot in high- and low-residue tillage systems. Journal of Production Agriculture 6:270-275.
  • Mazzola, M., R.W. Smiley, A.D. Rovira, and R.J. Cook. 1996. Characterization of Rhizoctonia isolates, disease occurrence and management in cereals. pp. 259-267. In. Rhizoctonia Species: Taxonomy, Molecular Biology, Ecology, Pathology, and Control (B. Sneh, S. Jabaji-Hare, S. Neate, and G. Dijst. eds.). Kluwer Academic Publishers, The Netherlands. 578 p.
  • Patterson, L-M., R.W. Smiley, and S.A. Alderman. 1998. Effect of seed treatment fungicides and starter fertilizer on root diseases and yield of spring wheat. Fungicide and Nematicide Tests 53:425.
  • Smiley, R.W., L. Patterson, K. Rhinhart, and E. Jacobsen. 1999. Disease management for annual crops in low-rainfall regions. Oregon Agricultural Experiment Station Special Report 999:59-67.
  • Smiley, R., R.J. Cook, and T. Paulitz. 2002. Controlling Root and Crown Diseases of Small Grain Cereals. OSU Ext. Publ. EM 8798. 6 p.
  • Paulitz, T., R. Smiley, and R.J. Cook. 2002. Insights into the prevalence and management of soilborne cereal pathogens under direct seeding in the Pacific Northwest U.S.A. Canadian Journal of Plant Pathology 24:416-428. (abstract)
  • Smiley, R.W. 1996. Diseases of wheat and barley in conservation cropping systems of the semi-arid Pacific Northwest . American Journal of Alternative Agriculture 11:95-103. (abstract)
  • Smith, J.D., K.K. Kidwell, M.A. Evans, R.J. Cook, and R.W. Smiley. 2003. Evaluation of spring cereal grains and wild Triticum germplasm for resistance to Rhizoctonia solani AG-8. Crop Science 43:701-709. (abstract)
  • Smith, J.D., K.K. Kidwell, M.A. Evans, R.J. Cook, and R.W. Smiley. 2003. Assessment of spring wheat genotypes for disease reaction to Rhizoctonia solani AG-8 in controlled environment and direct-seeded field evaluations. Crop Science 43:694-700. (abstract)
  • Lucas, P., R.W. Smiley, and H.P. Collins. 1993. Decline of Rhizoctonia root rot on wheat in soils infested with Rhizoctonia solani AG-8. Phytopathology 83:260-265. (abstract)
  • Smiley, R.W. and W. Uddin. 1993. Effect of soil temperature on Rhizoctonia root rot ( R. solani AG-8 and R. oryzae ) of winter wheat. Phytopathology 93:777-785. (abstract)
  • Smiley, R.W., and D.E. Wilkins. 1992. Impact of sulfonylurea herbicides on Rhizoctonia root rot, growth, and yield of winter wheat. Plant Disease 76:399-404. (abstract)
  • Smiley, R.W., A.G. Ogg, Jr., and R.J. Cook. 1992. Influence of glyphosate on severity of Rhizoctonia root rot, growth, and yield of barley. Plant Disease 76:937-942. (abstract)
  • Smiley, R.W., H.P. Collins, and P.E. Rasmussen. 1996. Diseases of wheat in long-term agronomic experiments at Pendleton, Oregon . Plant Disease 80:813-820. (abstract)
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