RESULTS

(7)

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DISEASE: Bacterial stem and root rot

HOST: Sweet potato

Collapse of stems and roots caused by systemic activity of the pathogen.

Bacterial stem and root rot | Sweet potato

DISEASE: Bacterial stem and root rot

HOST: Sweet potato (Ipomoea batatas)

PATHOGEN: Dickeya sp.

PATHOGEN SYNONYM: Erwinia chrysanthemi

SOURCE: N. Schaad

DISEASE: Bacterial stem and root rot

HOST: Sweet potato

Rot and collapse of stem, petioles, and leaves caused by systemic infection.

Bacterial stem and root rot | Sweet potato

DISEASE: Bacterial stem and root rot

HOST: Sweet potato (Ipomoea batatas)

PATHOGEN: Dickeya sp.

PATHOGEN SYNONYM: Erwinia chrysanthemi

SOURCE: N. Schaad

DISEASE: Bacterial stem and root rot

HOST: Sweet potato

Rot and internal discoloration of tuber.

Bacterial stem and root rot | Sweet potato

DISEASE: Bacterial stem and root rot

HOST: Sweet potato (Ipomoea batatas)

PATHOGEN: Dickeya sp.

PATHOGEN SYNONYM: Erwinia chrysanthemi

SOURCE: C. Clark

DISEASE: Brittle root

HOST: Horseradish

Dying, stunted, yellow to brown horseradish plants.

Brittle root | Horseradish

DISEASE: Brittle root

HOST: Horseradish (Armoracia rusticana)

PATHOGEN: Spiroplasma citri

SOURCE: C. Eastman, M. Davis

DISEASE: Brittle root

HOST: Horseradish

Close-up of stunted, yellow horseradish plants.

Brittle root | Horseradish

DISEASE: Brittle root

HOST: Horseradish (Armoracia rusticana)

PATHOGEN: Spiroplasma citri

SOURCE: D. Sherrod

DISEASE: Brittle root

HOST: Horseradish

Horseradish with discolored internal tissues. Healthy root segment (top right).

Brittle root | Horseradish

DISEASE: Brittle root

HOST: Horseradish (Armoracia rusticana)

PATHOGEN: Spiroplasma citri

SOURCE: J. Fletcher, M. Davis

DISEASE: Slippery skin

HOST: Onion

Rot progresses from the top of infected scales and eventually internal tissues rot. In early stages, the only external symptoms may be softening of the neck.

Slippery skin | Onion

DISEASE: Slippery skin

HOST: Onion (Allium cepa)

PATHOGEN: Burkholderia gladioli pv. alliicola

PATHOGEN SYNONYM: Pseudomonas gladioli pv. alliicola

SOURCE: H. Schwartz