RESULTS

(4)

FILTER

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 blight

HOST: Bindweed

Water-soaked areas and angular leaf spots with yellow ooze.

Bacterial blight | Bindweed

DISEASE: Bacterial blight

HOST: Bindweed (Convolvulus arvensis)

PATHOGEN: Xanthomonas campestris pv. convolvuli

SOURCE: S. Mohan

DISEASE: Bacterial leaf spot and blight

HOST: Parsley

Blighted leaves with large, brown necrotic areas.

Bacterial leaf spot and blight | Parsley

DISEASE: Bacterial leaf spot and blight

HOST: Parsley (Petroselinum crispum)

PATHOGEN: Pseudomonas syringae pv. apii

SOURCE: APS

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