RESULTS

(12)

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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: Witches'-broom

HOST: Alfalfa

Alfalfa plant (center) exhibiting stunting and proliferation of stems. Other symptoms are small, rounded, chlorotic, often puckered leaves and a yellowish cast.

Witches'-broom | Alfalfa

DISEASE: Witches'-broom

HOST: Alfalfa (Medicago sativa)

PATHOGEN: 'Candidatus Phytoplasma trifolii'

PATHOGEN SYNONYM: Phytoplasma Clover proliferation group

SOURCE: S. Thomson

DISEASE: Witches'-broom

HOST: Alfalfa

Young plant (left) with small, numerous stems (witches'-broom). Healthy stems (right).

Witches'-broom | Alfalfa

DISEASE: Witches'-broom

HOST: Alfalfa (Medicago sativa)

PATHOGEN: 'Candidatus Phytoplasma trifolii'

PATHOGEN SYNONYM: Phytoplasma Clover proliferation group

SOURCE: S. Thomson