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RESULTS

(11)

DISEASE: Bacterial leaf streak

HOST: Oat

Leaf with long, dark red streaks.

DISEASE: Bacterial soft rot

HOST: Wasabi (Japanese horseradish)

Longitudinal sections of diseased rhizomes with discolored vascular tissues.

DISEASE: Bacterial soft rot

HOST: Wasabi (Japanese horseradish)

Longitudinal section of rhizome with discolored vascular bundles (left), and rhizome with external symptoms (right).

DISEASE: Bacterial soft rot

HOST: Wasabi (Japanese horseradish)

Cross section of rhizome with dark, infected vascular bundles.

DISEASE: Black chaff (Bacterial leaf streak)

HOST: Wheatgrass

Lesions on leaves first appear as water-soaked, translucent, long, narrow streaks. They later turn brown and necrotic and often coalesce into blighted areas.

DISEASE: Black chaff (Bacterial leaf streak)

HOST: Wheatgrass

Close-up of leaf with brown necrotic streaks.

DISEASE: Elm yellows

HOST: Elm

Symptoms of elm yellows occasionally appear on one branch before others, but more often they involve the entire crown.

DISEASE: Elm yellows

HOST: Elm

Diseased twig (right) with epinasty, chlorosis, and yellowing of leaves. Sometimes both yellow and green leaves occur on same branch. Healthy branch (left).

DISEASE: Elm yellows

HOST: Elm

Branches with butterscotch discoloration (center) and necrotic flecks in phloem and vascular cambium (right). Healthy branch (left). Sudden wilt and browning is common with small trees.