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(3)

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DISEASE: Alfalfa dwarf

HOST: Alfalfa

Alfalfa dwarf is characterized by stunted plants (left), usually dark blue-green in color. Xylem tissues become brown, especially when exposed to air.

Alfalfa dwarf | Alfalfa

DISEASE: Alfalfa dwarf

HOST: Alfalfa (Medicago sativa)

PATHOGEN: Xylella fastidiosa

SOURCE: R. M. Davis

DISEASE: Bacterial blight and bacterial leaf streak

HOST: Rice

Xanthomonas oryzae pv. oryzicola (bacterial leaf streak) causes water-soaked streaks with yellow ooze (left side), and X. oryzae pv. oryzae (bacterial blight) causes brown streaks that have turned white (right side).

Bacterial blight and bacterial leaf streak | Rice

DISEASE: Bacterial blight and bacterial leaf streak

HOST: Rice (Oryza sativa)

PATHOGEN: Xanthomonas oryzae pv. oryzicola

PATHOGEN SYNONYM: Xanthomonas campestris pv. oryzae

SOURCE: T. Mew

DISEASE: Strawberry yellows

HOST: Strawberry

Symptoms of disease are stunting and marginal chlorosis of younger leaves and purple or bronze pigmentation of older leaves. Infected plants usually die.

Strawberry yellows | Strawberry

DISEASE: Strawberry yellows

HOST: Strawberry (Fragaria × ananassa)

PATHOGEN: 'Candidatus Phytoplasma' sp.

PATHOGEN SYNONYM: Phytoplasma (undefined)

SOURCE: R. S. Greber