RESULTS

(36)

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DISEASE: Angular leaf spot

HOST: Tobacco

Leaf with light brown, angular spots. The difference between this disease and wildfire of tobacco is that wildfire is caused by a strain that produces tabtoxin. It causes conspicuous halos around lesions and large parts of a leaf may turn yellow .

Angular leaf spot | Tobacco

DISEASE: Angular leaf spot

HOST: Tobacco (Nicotiana tabacum)

PATHOGEN: Pseudomonas syringae pv. tabaci

SOURCE: H. Shew

DISEASE: Angular leaf spot

HOST: Tobacco

Yellowing of adjacent tissues occur as spots age (midseason). It causes conspicuous halos around lesions. Large parts of a leaf may turn yellow.

Angular leaf spot | Tobacco

DISEASE: Angular leaf spot

HOST: Tobacco (Nicotiana tabacum)

PATHOGEN: Pseudomonas syringae pv. tabaci

SOURCE: H. Shew

DISEASE: Angular leaf spot

HOST: Tobacco

Severely diseased leaf with extensive yellowing.

Angular leaf spot | Tobacco

DISEASE: Angular leaf spot

HOST: Tobacco (Nicotiana tabacum)

PATHOGEN: Pseudomonas syringae pv. tabaci

SOURCE: H. Shew

DISEASE: Aster yellows

HOST: Onion

Infected plants with yellowish, malformed leaves.

Aster yellows | Onion

DISEASE: Aster yellows

HOST: Onion (Allium cepa)

PATHOGEN: 'Candidatus Phytoplasma asteris'

PATHOGEN SYNONYM: Phytoplasma Aster yellows group

SOURCE: R. Rowe

DISEASE: Aster yellows

HOST: Onion

Onion flower with unusual symptoms (left) compared with healthy inflorescence (right). Flowers are distorted and often have abnormally long pedicels. Young leaves may have yellow streaks or a general yellowing of basal portions.

Aster yellows | Onion

DISEASE: Aster yellows

HOST: Onion (Allium cepa)

PATHOGEN: 'Candidatus Phytoplasma asteris'

PATHOGEN SYNONYM: Phytoplasma Aster yellows group

SOURCE: R. Raabe

DISEASE: Bacterial fasciation (Leafy gall)

HOST: Petunia

Note hyperplasia and leafy galls.

Bacterial fasciation (Leafy gall) | Petunia

DISEASE: Bacterial fasciation (Leafy gall)

HOST: Petunia (Petunia sp.)

PATHOGEN: Rhodococcus fascians

SOURCE: M. Shurtleff

DISEASE: Bacterial fasciation (Leafy gall)

HOST: Petunia

Leaf proliferation at crown region.

Bacterial fasciation (Leafy gall) | Petunia

DISEASE: Bacterial fasciation (Leafy gall)

HOST: Petunia (Petunia hybrida)

PATHOGEN: Rhodococcus fascians

SOURCE: R. Raabe

DISEASE: Bacterial fasciation (Leafy gall)

HOST: Tobacco

Bacterial fasciation of tobacco.

Bacterial fasciation (Leafy gall) | Tobacco

DISEASE: Bacterial fasciation (Leafy gall)

HOST: Tobacco (Nicotiana tabacum)

PATHOGEN: Rhodococcus fascians

SOURCE: R. Raabe

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