RESULTS

(4)

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DISEASE: Aster yellows

HOST: Squash

Diagnostic characteristics for the disease are yellowing of young leaves, proliferation of secondary shoots, and rigid erect habit. Leaves are misshapen and smaller than normal and have stiff, thick laminae.

Aster yellows | Squash

DISEASE: Aster yellows

HOST: Squash (Cucurbita sp.)

PATHOGEN: 'Candidatus Phytoplasma asteris'

PATHOGEN SYNONYM: Phytoplasma Aster yellows group

SOURCE: S. Miller

DISEASE: Bacterial leaf spot

HOST: Rhododendron

Leaf with light brown, irregularly shaped spots.

Bacterial leaf spot | Rhododendron

DISEASE: Bacterial leaf spot

HOST: Rhododendron (Rhododendron catawbiense 'Album')

PATHOGEN: Pseudomonas cichorii

SOURCE: W. Uddin, W. Sinclair

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

DISEASE: Bunch disease

HOST: Hickory

Bunch disease of shagbark hickory caused by a phytoplasma.

Bunch disease | Hickory

DISEASE: Bunch disease

HOST: Hickory (Carya sp.)

PATHOGEN: 'Candidatus Phytoplasma' sp.

PATHOGEN SYNONYM: Phytoplasma (undefined)

SOURCE: P. Fenn