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DISEASE: Apple proliferation

HOST: Apple

Enlarged stipules on leaf. Witches'-brooms, rosettes, and enlarged stipules are the most reliable symptoms for identification.

Apple proliferation | Apple

DISEASE: Apple proliferation

HOST: Apple (Malus domestica 'Granny Smith')

PATHOGEN: 'Candidatus Phytoplasma mali'

PATHOGEN SYNONYM: Phytoplasma Apple proliferation group

SOURCE: M. Wolf, W. Schweigkofler

DISEASE: Bacterial leaf spot

HOST: Radish

Leaf with brown lesions, some with a water-soaked appearance.

Bacterial leaf spot | Radish

DISEASE: Bacterial leaf spot

HOST: Radish (Raphanus sativus var. longipinnatus)

PATHOGEN: Pseudomonas syringae pv. maculicola

SOURCE: J. Togashi, M. Goto

DISEASE: Bacterial soft rot

HOST: Radish

Rot and collapse of internal root tissues.

Bacterial soft rot | Radish

DISEASE: Bacterial soft rot

HOST: Radish (Raphanus sativus var. longipinnatus)

PATHOGEN: Pectobacterium carotovorum

PATHOGEN SYNONYM: Erwinia carotovora subsp. carotovora

SOURCE: M. Goto

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