RESULTS

(8)

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DISEASE: Bacterial blight

HOST: Tulip

The disease causes white veins of leaves, yellow vascular bundles, and yellow bacterial slime on bulbs.

Bacterial blight | Tulip

DISEASE: Bacterial blight

HOST: Tulip (Tulipa sp. 'Paul Richter')

PATHOGEN: Curtobacterium flaccumfaciens pv. oortii

PATHOGEN SYNONYM: Corynebacterium flaccumfaciens subsp. oortii

SOURCE: M. Geesteranus, J. van der Wolf

DISEASE: Bacterial blight

HOST: Tulip

Stunted plants with wrinkled leaves.

Bacterial blight | Tulip

DISEASE: Bacterial blight

HOST: Tulip (Tulipa sp. 'Paul Richter')

PATHOGEN: Curtobacterium flaccumfaciens pv. oortii

PATHOGEN SYNONYM: Corynebacterium flaccumfaciens subsp. oortii

SOURCE: M. Geesteranus, J. van der Wolf

DISEASE: Bacterial leaf scorch

HOST: Pecan

Pecan with necrotic scorched leaves with distinct dark lines between healthy and diseased tissues.

Bacterial leaf scorch | Pecan

DISEASE: Bacterial leaf scorch

HOST: Pecan (Carya illinoinensis)

PATHOGEN: Xylella fastidiosa

SOURCE: T. Brenneman

DISEASE: Bacterial leaf spot

HOST: Croton

Tan, irregular-sized lesions on lower leaf surfaces.

Bacterial leaf spot | Croton

DISEASE: Bacterial leaf spot

HOST: Croton (Codiaeum variegatum var. pictum)

PATHOGEN: Xanthomonas axonopodis pv. poinsettiicola

PATHOGEN SYNONYM: Xanthomonas campestris pv. poinsettiicola

SOURCE: J. Yuen

DISEASE: Bacterial leaf spot

HOST: Croton

Leaves with dry, irregularly shaped, brown necrotic areas.

Bacterial leaf spot | Croton

DISEASE: Bacterial leaf spot

HOST: Croton (Codiaeum variegatum)

PATHOGEN: Xanthomonas codiaei

SOURCE: A. Chase

DISEASE: Bunch disease

HOST: Pecan

Pecan exhibiting bunch symptoms at ends of branches. This disease is thought to be caused by a phytoplasma similar to the walnut bunch pathogen in the X-disease group.

Bunch disease | Pecan

DISEASE: Bunch disease

HOST: Pecan (Carya illinoinensis)

PATHOGEN: 'Candidatus Phytoplasma pruni'

PATHOGEN SYNONYM: Phytoplasma X-disease group

SOURCE: W. Sinclair

DISEASE: Bunch disease

HOST: Pecan

Severe case of bunch disease. Note bunches of foliage.

Bunch disease | Pecan

DISEASE: Bunch disease

HOST: Pecan (Carya illinoinensis)

PATHOGEN: 'Candidatus Phytoplasma pruni'

PATHOGEN SYNONYM: Phytoplasma X-disease group

SOURCE: P. Bertrand

DISEASE: Witches'-broom

HOST: Pecan

Diseased pecan with short branches on trunk with witches'-broom appearance.

Witches'-broom | Pecan

DISEASE: Witches'-broom

HOST: Pecan (Carya illinoinensis)

PATHOGEN: 'Candidatus Phytoplasma pruni'

PATHOGEN SYNONYM: Phytoplasma X-disease group

SOURCE: P. Bertrand