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 wilt

HOST: Grass

Wilted and dead patches of diseased creeping bent grass (Toronto grass) on golf green.

Bacterial wilt | Grass

DISEASE: Bacterial wilt

HOST: Grass (Agrostis stolonifera)

PATHOGEN: Xanthomonas translucens pv. poae

SOURCE: D. Roberts

DISEASE: Bacterial wilt

HOST: Grass

Irregular disease patterns on golf green. The cultivars Toronto, Cohansey, and Nimisilia are primary hosts of the disease.

Bacterial wilt | Grass

DISEASE: Bacterial wilt

HOST: Grass (Agrostis stolonifera)

PATHOGEN: Xanthomonas translucens pv. poae

SOURCE: D. Roberts

DISEASE: Crown gall

HOST: Grape

Gall on base of 'Zinfandel' grape in California, where aerial galls are less common because of dry, hot weather.

Crown gall | Grape

DISEASE: Crown gall

HOST: Grape (Vitis vinifera 'Zinfandel')

PATHOGEN: Agrobacterium vitis

PATHOGEN SYNONYM: Rhizobium vitus

SOURCE: M. Schroth