RESULTS

(8)

FILTER

DISEASE: Bacterial blight (Boll rot)

HOST: Cotton

Boll rot first appears as raised, water-soaked lesions, which become sunken and turn brown to black with time.

Bacterial blight (Boll rot) | Cotton

DISEASE: Bacterial blight (Boll rot)

HOST: Cotton (Gossypium barbadense)

PATHOGEN: Xanthomonas citri subsp. malvacearum

PATHOGEN SYNONYM: Xanthomonas campestris pv. malvacearum

SOURCE: A. Hayward

DISEASE: Bacterial blight (Boll rot)

HOST: Cotton

Infection of bolls causes premature opening and increased susceptibility to secondary, saprophytic microorganisms that cause rot. Note discolored cotton.

Bacterial blight (Boll rot) | Cotton

DISEASE: Bacterial blight (Boll rot)

HOST: Cotton (Gossypium barbadense)

PATHOGEN: Xanthomonas citri subsp. malvacearum

PATHOGEN SYNONYM: Xanthomonas campestris pv. malvacearum

SOURCE: APS

DISEASE: Marginal leaf blight

HOST: Lettuce

Marginal leaf blight first appears as slimy wilting of leaf margins. Small, reddish lesions may be seen on leaf blades. Infected tissues turn brown to black in time.

Marginal leaf blight | Lettuce

DISEASE: Marginal leaf blight

HOST: Lettuce (Lactuca sativa)

PATHOGEN: Pseudomonas marginalis

SOURCE: L. Fucikovsky

DISEASE: Pear decline

HOST: Pear

Healthy pear shoot (left) and diseased shoots (center and right). Leaves are reddish and growth is stunted.

Pear decline | Pear

DISEASE: Pear decline

HOST: Pear (Pyrus communis)

PATHOGEN: 'Candidatus Phytoplasma pyri'

PATHOGEN SYNONYM: Phytoplasma Apple proliferation group

SOURCE: S. Thomson

DISEASE: Pear decline

HOST: Pear

Close-up of infected pear branch showing premature reddish coloration of leaves and cupped, stunted leaves.

Pear decline | Pear

DISEASE: Pear decline

HOST: Pear (Pyrus communis)

PATHOGEN: 'Candidatus Phytoplasma pyri'

PATHOGEN SYNONYM: Phytoplasma Apple proliferation group

SOURCE: S. Thomson

DISEASE: Pear decline

HOST: Pear

Reduced growth of infected trees in center of image.

Pear decline | Pear

DISEASE: Pear decline

HOST: Pear (Pyrus communis)

PATHOGEN: 'Candidatus Phytoplasma pyri'

PATHOGEN SYNONYM: Phytoplasma Apple proliferation group

SOURCE: W. Sinclair

DISEASE: Pear decline

HOST: Pear

Psylla pyricola, the psyllid vector of pear decline phytoplasma.

Pear decline | Pear

DISEASE: Pear decline

HOST: Pear (Pyrus communis)

PATHOGEN: 'Candidatus Phytoplasma pyri'

PATHOGEN SYNONYM: Phytoplasma Apple proliferation group

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

DISEASE: Pear decline

HOST: Pear

'Bartlett' pears were grafted onto tolerant rootstock. All trees are infected. Note yellowish, diseased branches.

Pear decline | Pear

DISEASE: Pear decline

HOST: Pear (Pyrus communis 'Bartlett')

PATHOGEN: 'Candidatus Phytoplasma pyri'

PATHOGEN SYNONYM: Phytoplasma Apple proliferation group

SOURCE: C. Smart