Common root rot (barley)

Common root rot is a fungal disease of barley caused by Cochliobolus sativus, Fusarium culmorum and F. graminearum.

Symptoms

Initial symptoms appear as small brown spots on the crown roots, the lower sheath, and the subcrown internode. This spots will elongate and coalesce and can cause an extensive brown discoloration at the crown, and the entire length of the subcrown internode. Healthy root tissue is white to slightly cream-colored.

Disease cycle

In western Canada, infections occur mainly from soil-borne spores, whereas in eastern Canada, seed-borne inoculum is more important. The spores can survive for many years, and germinate in the presence of susceptible plants. At infected plants reach maturity, abundant sporulation occurs.

Management

Disease inoculum is reduced by long rotations with nonhost crops. Shallow seeding and optimum fertilization levels, especially of phosphate and potassium, reduce disease severity. Resistance cultivars are also available.

External links

Research articles

Bailey, K.L. (1994). "Genetic relationships between reaction to common root rot and yield in the progeny of a barley cross" (PDF). CJPP. 16: 163–169. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help); line feed character in |coauthors= at position 11 (help)

Conner, R.L. (1989). "Influence of continuous cropping on severity of common root rot in wheat and barley" (PDF). CJPP. 11: 127–132. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

Conner, R.L. (1996). "Influence of crop rotation on common root rot of wheat and barley" (PDF). CJPP. 18: 247–254. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

Duczek, L.J. (1984). "Comparison of the common root rot reaction of barley lines and cultivars in northwestern Alberta and central Saskatchewan" (PDF). CJPP. 6: 81–89.

Duczek, L.J. (1997). "Biological control of common root rot in barley by Idriella bolleyi" (PDF). CJPP. 19: 402–405.

Duczek, L.J. (1985). "Effect of inoculum density of Cochliobolus sativus on coomon root rot of wheat and barley" (PDF). CJPP. 7: 382–386. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

Duczek, L.J. (1990). "Sporulation of Cochliobolus sativus on crown and underground parts of spring cereals in relation to weather and host species, cultivar, and phenology" (PDF). CJPP. 12: 273–278.

Duczek, L.J. (1993). "Relationships between common root rot, tillering, and yield loss in spring wheat and barley" (PDF). CJPP. 15: 153–158. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

Kidambi, R.D. (1985). "Disease progress and epidemiology of crown rot of spring barley in Utah" (PDF). CJPP. 7: 233–237. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

Kidambi, R.D. (1985). "Influence of infection by Cochliobolus sativus on yield components of spring barley" (PDF). CJPP. 7: 238–241. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

Kokko, E.G. (2000). "Quantification of common root rot symptoms in resistant and susceptible barley by image analysis" (PDF). CJPP. 22: 38–43. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

Kutcher, H.R. (1994). "Heritability of common root rot and spot blotch resistance in barley" (PDF). CJPP. 16: 287–294. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

Morall, R.A.A. (1981). "Disease progress curves, linear transformations, and common root rot of cereals" (PDF). CJPP. 3: 182–183. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

Pienning, L.J. (1983). "Control of common root rot and loose smut and the phtotoxicity of seed treatment fungicides on Gateway barley" (PDF). CJPP. 5: 49–53. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

Pienning, L.J. (1983). "Effect of fertilizer on root rot of barley on stubble and fallow land" (PDF). CJPP. 5: 136–139. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

Pua, Eng-Chong (1985). "Seedling blight, spot blotch, and common root rot in Quebec and their effect on grain yield in barley" (PDF). CJPP. 7: 395–401. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

Stack, R.W. (1980). "Disease progression in common rot of spring wheat and barley" (PDF). CJPP. 2: 187–193.

Stack, R.W. (1981). "Disease progression in common root rot" (PDF). CJPP. 3: 184.

Verma, P.R. (1982). "Temporal progression of common root rot [Cochliobolus sativus] lesions on subcrown internodes of wheat and barley cultivars" (PDF). CJPP. 4: 349–352.

Verma, P.R. (1981). "Effect of imazalil seed treatment of common root rot and grain yields of cereal cultivars" (PDF). CJPP. 3: 239–243. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

van Leur, J.A.G. (2000). "The occurrence of barley root diseases in different agri-ecological zones of Syria" (PDF). CJPP. 22: 61–69. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)