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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 dieback of nectarine

HOST: Nectarine

Fruit lesions is another symptom of this disease.

Bacterial dieback of nectarine | Nectarine

DISEASE: Bacterial dieback of nectarine

HOST: Nectarine (Prunus persica var. nucipersica 'Redgold')

PATHOGEN: Pseudomonas syringae pv. persicae

SOURCE: J. Young

DISEASE: Bacterial spot

HOST: Nectarine

Nectarine with necrotic spots on leaves and dark necrotic spots on fruit.

Bacterial spot | Nectarine

DISEASE: Bacterial spot

HOST: Nectarine (Prunus persica var. nucipersica 'Redgold')

PATHOGEN: Xanthomonas arboricola pv. pruni

PATHOGEN SYNONYM: Xanthomonas campestris pv. pruni

SOURCE: J. Young

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