DISEASE: Aster yellows
HOST: Potato
Chlorotic and stunted foliage with necrotic leaf margins. Other symptoms may be phyllody, virescence, purple or yellow pigmentation, and rolling of leaflets.
Aster yellows | Potato
DISEASE: Aster yellows
HOST: Potato (Solanum tuberosum)
PATHOGEN: 'Candidatus Phytoplasma asteris'
PATHOGEN SYNONYM: Phytoplasma Aster yellows group
SOURCE: S. Thomson
DISEASE: Aster yellows
HOST: Potato
Stunted, chlorotic plants (left) with stiff, rolled leaves.
Aster yellows | Potato
DISEASE: Aster yellows
HOST: Potato (Solanum tuberosum)
PATHOGEN: 'Candidatus Phytoplasma asteris'
PATHOGEN SYNONYM: Phytoplasma Aster yellows group
SOURCE: S. Thomson
DISEASE: Aster yellows
HOST: Potato
Diseased plant with malformed tubers.
Aster yellows | Potato
DISEASE: Aster yellows
HOST: Potato (Solanum tuberosum)
PATHOGEN: 'Candidatus Phytoplasma asteris'
PATHOGEN SYNONYM: Phytoplasma Aster yellows group
SOURCE: S. Thomson
DISEASE: Bacterial blight
HOST: Soybean
Leaves with yellowish brown necrotic lesions. Lesions also may be yellow to light brown and bordered by yellowish green halos. Lesions occur on stems, petioles, and pods.
Bacterial blight | Soybean
DISEASE: Bacterial blight
HOST: Soybean (Glycine max)
PATHOGEN: Pseudomonas syringae pv. glycinea
SOURCE: J. B. Sinclair
DISEASE: Bacterial blight
HOST: Spathiphyllum
Progression of disease severity on leaves from right to left.
Bacterial blight | Spathiphyllum
DISEASE: Bacterial blight
HOST: Spathiphyllum (Spathiphyllum sp.)
PATHOGEN: Xanthomonas axonopodis pv. dieffenbachiae
PATHOGEN SYNONYM: Xanthomonas campestris pv. dieffenbachiae
SOURCE: A. Alvarez
DISEASE: Bacterial leaf spot
HOST: Soybean
Early symptoms of bacterial blight.
Bacterial leaf spot | Soybean
DISEASE: Bacterial leaf spot
HOST: Soybean (Glycine max)
PATHOGEN: Pseudomonas syringae pv. glycinea
SOURCE: D. Cupples
DISEASE: Bacterial leaf spot
HOST: Soybean
Leaf with large, light brown necrotic lesions.
Bacterial leaf spot | Soybean
DISEASE: Bacterial leaf spot
HOST: Soybean (Glycine max)
PATHOGEN: Pseudomonas viridiflava
SOURCE: R. Gitaitis
DISEASE: Bacterial pustule
HOST: Soybean
Early symptoms are minute, pale green spots on young leaves. Later, small pustules form in the center of spots, best observed on underside of leaves. Spots vary in size and darken with age and lesions coalesce. Dead areas are torn away by wind.
Bacterial pustule | Soybean
DISEASE: Bacterial pustule
HOST: Soybean (Glycine max)
PATHOGEN: Xanthomonas axonopodis pv. glycines
PATHOGEN SYNONYM: Xanthomonas campestris pv. glycines
SOURCE: APS
DISEASE: Bacterial ring rot
HOST: Potato
Stunted plant with withered leaves (right).
Bacterial ring rot | Potato
DISEASE: Bacterial ring rot
HOST: Potato (Solanum tuberosum)
PATHOGEN: Clavibacter michiganensis subsp. sepedonicus
SOURCE: M. Schroth