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GrainGenes Pathology Report: Loose Smut

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Pathology
Loose Smut
Other Name
True Loose Smut
Type
Fungus
Host Species
Triticum aestivum
X Triticosecale
Secale cereale
Hordeum vulgare
Causal Organism
Ustilago tritici
Trait
Reaction to smut
Evaluation
Reaction to smut, 1997 QUON
[ Show all 6 ]
Gene Class
Reaction to Ustilago nuda
Reaction to Ustilago tritici (Pers.) Rostrup
Reaction to Ustilago avenae
Resistance Gene
Run1 (Hordeum)
[ Show all 22 ]
Symptoms
Floral parts of infected plants are replaced with a mass of black powdery spores during head development. Infected tillers usual head before healthy tillers. Spore mass is disseminated by wind and/or rain, spreading spores to normal heads of surrounding plants. Germinating spores infect developing kernels but permit normal grain development. Fungus remains dormant in seed until planted and germination occurs. Infection progressively moves up the tiller during normal stem development. Infection of the developing head completes the cycle.
Image
A barley spike displaying the black spore masses...
[ Show all 6 ]
Reference
ReferenceKephart KD (1993) Winter wheat disease management Insect and plant disease management handbook.
Reference(1987) Compendium of wheat diseases.