DISEASE: Bacterial blight
HOST: Parsnip
Parsnip with severe blight symptoms. There also is browning of the vascular system. Rot may progress from the crown into roots.
![](/sites/default/files/plant_disease/images/0654.jpg)
Bacterial blight | Parsnip
DISEASE: Bacterial blight
HOST: Parsnip (Pastinaca sativa)
PATHOGEN: Pseudomonas viridiflava
SOURCE: J. Hunter
DISEASE: Bacterial leaf scorch
HOST: Pecan
Pecan with necrotic scorched leaves with distinct dark lines between healthy and diseased tissues.
![](/sites/default/files/plant_disease/images/0701.jpg)
Bacterial leaf scorch | Pecan
DISEASE: Bacterial leaf scorch
HOST: Pecan (Carya illinoinensis)
PATHOGEN: Xylella fastidiosa
SOURCE: T. Brenneman
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.
![](/sites/default/files/plant_disease/images/0698.jpg)
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.
![](/sites/default/files/plant_disease/images/0699.jpg)
Bunch disease | Pecan
DISEASE: Bunch disease
HOST: Pecan (Carya illinoinensis)
PATHOGEN: 'Candidatus Phytoplasma pruni'
PATHOGEN SYNONYM: Phytoplasma X-disease group
SOURCE: P. Bertrand