RESULTS

(6)

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DISEASE: Bacterial flower stalk and leaf necrosis

HOST: Onion

Dark, rotted areas of stalk and leaves caused by systemic invasion of the pathogen.

Bacterial flower stalk and leaf necrosis | Onion

DISEASE: Bacterial flower stalk and leaf necrosis

HOST: Onion (Allium cepa)

PATHOGEN: Pseudomonas marginalis pv. marginalis

SOURCE: S. Mohan

DISEASE: Bacterial flower stalk and leaf necrosis

HOST: Onion

Gray-brown rot of onion after inoculation. Disease starts as small, water-soaked lesions that later develop into slimy, gray-brown rot. The disease progresses downward from the stalk and may rot the entire bulb.

Bacterial flower stalk and leaf necrosis | Onion

DISEASE: Bacterial flower stalk and leaf necrosis

HOST: Onion (Allium cepa)

PATHOGEN: Pseudomonas marginalis pv. marginalis

SOURCE: R. Gitaitis

DISEASE: Bacterial flower stalk and leaf necrosis

HOST: Onion

Leaves with necrosis and rot. The common name for this disease is the same as those used for two other diseases. Also, another common name for this disease is bacterial soft rot.

Bacterial flower stalk and leaf necrosis | Onion

DISEASE: Bacterial flower stalk and leaf necrosis

HOST: Onion (Allium cepa)

PATHOGEN: Pseudomonas marginalis pv. marginalis

SOURCE: S. Mohan

DISEASE: Bermudagrass white leaf

HOST: Grass

White leaf disease of bermudagrass.

Bermudagrass white leaf | Grass

DISEASE: Bermudagrass white leaf

HOST: Grass (Cynodon transvaalensis)

PATHOGEN: 'Candidatus Phytoplasma cynodontis'

PATHOGEN SYNONYM: Phytoplasma Bermuda white leaf group

SOURCE: M. Davis

DISEASE: Periwinkle wilt

HOST: Periwinkle

Infected plants with stunting and sparse foliage (center and right).

Periwinkle wilt | Periwinkle

DISEASE: Periwinkle wilt

HOST: Periwinkle (Vinca sp.)

PATHOGEN: Xylella fastidiosa

SOURCE: R. McCoy, M. Davis

DISEASE: Periwinkle wilt

HOST: Periwinkle

Draeculacephala minerva, leafhopper vector of Xylella fastidiosa on plants such as periwinkle and watercress.

Periwinkle wilt | Periwinkle

DISEASE: Periwinkle wilt

HOST: Periwinkle (Vinca sp.)

PATHOGEN: Xylella fastidiosa

SOURCE: J. Clark, A. Purcell, M. Davis