RESULTS

(4)

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DISEASE: Ash yellows

HOST: Ash

Ash sapling with basal sprouts and chlorotic leaves.

Ash yellows | Ash

DISEASE: Ash yellows

HOST: Ash (Fraxinus pennsylvanica)

PATHOGEN: 'Candidatus Phytoplasma fraxini'

PATHOGEN SYNONYM: Phytoplasma Ash yellows group

SOURCE: W. Sinclair

DISEASE: Aster yellows

HOST: Ranunculus

Malformation of diseased flower.

Aster yellows | Ranunculus

DISEASE: Aster yellows

HOST: Ranunculus (Ranunculus sp.)

PATHOGEN: 'Candidatus Phytoplasma asteris'

PATHOGEN SYNONYM: Phytoplasma Aster yellows group

SOURCE: R. Raabe

DISEASE: Bacterial leaf spot (Blight)

HOST: Ranunculus

Leaf with large, brown necrotic areas delimited by veins.

Bacterial leaf spot (Blight) | Ranunculus

DISEASE: Bacterial leaf spot (Blight)

HOST: Ranunculus (Ranunculus sp.)

PATHOGEN: Xanthomonas campestris

SOURCE: R. Raabe

DISEASE: Bacterial wilt

HOST: Squash

Field with severe symptoms of wilt. Foliage often is chlorotic and leaf margins may be chlorotic and necrotic before plant death. Bacterial ooze may be seen streaming from the xylem when infected stems are cut.

Bacterial wilt | Squash

DISEASE: Bacterial wilt

HOST: Squash (Cucurbita maxima)

PATHOGEN: Erwinia tracheiphila

SOURCE: B. Jacobsen, M. Shurtleff