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GrainGenes Pathology Report: Common Root Rot

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Common Root Rot
Other Name
Seedling Blight
Dryland Root Rot
Host Species
Triticum aestivum
Hordeum vulgare
Causal Organism
Bipolaris sorokiniana
Fusarium graminearum
Cochliobolus sativus
Fusarium culmorum
Gene Class
Reaction to Cochliobolus sativus Ito and Kurib
Caused by a complex of soilborne fungi. Symptoms include dampening off (sudden death) of emerging seedlings, stunted chlorotic growth, reduced root areas and decay of the crown area. Severe infections can abort tillers. A darkening or reddish-brown decay often occurs in the subcrown internode between the crown and kernel. Early detection is required for proper diagnosis. Secondary infections by other soilborne pathogens often mask initial symptoms. Common root rot is favored by soil compaction that restricts root growth and over applications of fertilizer nitrogen under moisture stress conditions. Plants stressed by Hessian flies are also more subject to infection by common root rot.
Symptoms of common root rot...
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Reference(1987) Compendium of wheat diseases.
Reference(1982) Compendium of barley diseases.