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Rhizoctonia Root Rot in Barley: A New Challenge

Investigating the impact of Bare Patch in barley crops in Montana, comparing it to Pythium and exploring the effects of glyphosate timing on yield. Seed treatments, controls, and preventive measures are discussed to manage Rhizoctonia root rot in winter wheat. Includes insights on the symptoms and factors favoring these diseases.

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Rhizoctonia Root Rot in Barley: A New Challenge

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Presentation Transcript

  1. Bare patch • Rhizoctonia root rot • A ‘new’ problem?

  2. Barley, N of Bozeman, MT Roundup (glyphosate): April 16 Planting date: April 17 Planting date: 1 week later

  3. Seed treatments: • Bare Patch: Baytan, Dividend and Vitavax • Pythium* : Apron, Allegiance, Dividend XL, RTA and Raxil XT *All Metalaxyl-based products

  4. Effects of Glyphosate Timing on Barley Yield Smiley et al 1992

  5. Rhizoctonia Often circular areas of missing plants Surviving seedlings may have purpling Not restricted to wet low lying areas Pythium Poor stand establishment in low-lying areas No-till production Favored by cool temperatures and wet soil. Bare Patch vs. Root RotA ‘new’ problem?

  6. Seed treatments to control Rhizoctonia root rot in winter wheat(Bozeman, 2007)

  7. Other controls • Timely weed and volunteer control • Fallow period • Soil disturbance (disking) • Crop rotation (Rhizoctonia species tend to be host-specific, but some isolates like AG-8 in OR/WA infect wheat, barley, pea, lentil) • Rhizoctonia solani: Cereals/monocots • Variety resistance, if available

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