RESULTS

(5)

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DISEASE: Aster yellows

HOST: Aster

Foliar symptoms of chlorosis, malformation of leaves, and phyllody.

Aster yellows | Aster

DISEASE: Aster yellows

HOST: Aster (Aster sp.)

PATHOGEN: 'Candidatus Phytoplasma asteris'

PATHOGEN SYNONYM: Phytoplasma Aster yellows group

SOURCE: R. McCoy, M. Davis

DISEASE: Aster yellows

HOST: Aster

Flowers with phyllody (left and center). Healthy flower (right).

Aster yellows | Aster

DISEASE: Aster yellows

HOST: Aster (Aster sp.)

PATHOGEN: 'Candidatus Phytoplasma asteris'

PATHOGEN SYNONYM: Phytoplasma Aster yellows group

SOURCE: R. McCoy, M. Davis

DISEASE: Aster yellows

HOST: Aster

Macrosteles sp., a leafhopper vector of aster yellows phytoplasma.

Aster yellows | Aster

DISEASE: Aster yellows

HOST: Aster (Aster sp.)

PATHOGEN: 'Candidatus Phytoplasma asteris'

PATHOGEN SYNONYM: Phytoplasma Aster yellows group

SOURCE: J. Clark, A. Purcell, M. Davis

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: Elm yellows

HOST: Elm

Elm yellows is characterized by witches'-brooms and stunting. Some cultivars have both yellow and reddish foliar discoloration.

Elm yellows | Elm

DISEASE: Elm yellows

HOST: Elm (Ulmus parvifolia)

PATHOGEN: 'Candidatus Phytoplasma ulmi'

PATHOGEN SYNONYM: Phytoplasma Elm yellows group

SOURCE: W. Sinclair