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GrainGenes Pathology Report: Black Chaff

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Pathology
Black Chaff
Other Name
Bacterial Stripe
Bacterial Leaf Streak
Bacterial Streak
Type
Bacterium
Host Species
Triticum aestivum
[ Show all 6 ]
Causal Organism
Xanthomonas campestris pv. translucens
Symptoms
Attacks leaves, stems and heads of wheat, particularly when grown under sprinkler irrigation. Symptoms on leaves (Bacterial Stripe) appear initially as water soaked spots and streaks that eventually turn brown and occasionally surrounded by a lime-green halo. Dark purple lesions with light yellow centers often form on the stem between the flag leaf collar and the head. Glumes of infected heads develop dark blotches. Infected awns develop a striped 'barber pole' appearance from alternating bands of diseased and healthy tissue. Bacteria spread to healthy plants by splashing water from rain or irrigation. Bacteria are spread between season on infested seed and straw.
Image
[ Hide all but 1 of 10 ]
Black chaff infected wheat seedlings...
Black chaff infected leaf showing necrotic regions...
Characteristic darkening of wheat glumes...
Advanced stages of black chaff...
Bacterial stipe on barley leaves...
Droplets of bacterial exudate...
Xanthomonas translucens on a barley leaf....
Cloudy, yellowish bacterial exudate,...
Symptoms of black chaff...
Symptoms of black chaff,...
Reference
ReferenceKephart KD (1993) Winter wheat disease management Insect and plant disease management handbook.
Reference(1987) Compendium of wheat diseases.