DISEASE: Aster yellows
HOST: Squash
Diagnostic characteristics for the disease are yellowing of young leaves, proliferation of secondary shoots, and rigid erect habit. Leaves are misshapen and smaller than normal and have stiff, thick laminae.
Aster yellows | Squash
DISEASE: Aster yellows
HOST: Squash (Cucurbita sp.)
PATHOGEN: 'Candidatus Phytoplasma asteris'
PATHOGEN SYNONYM: Phytoplasma Aster yellows group
SOURCE: S. Miller
DISEASE: Bacterial black leaf spot
HOST: Clover
White clover with brown necrotic spots.
Bacterial black leaf spot | Clover
DISEASE: Bacterial black leaf spot
HOST: Clover (Trifolium repens)
PATHOGEN: Burkholderia andropogonis
PATHOGEN SYNONYM: Pseudomonas andropogonis
SOURCE: M. Goto
DISEASE: Bacterial black leaf spot
HOST: Clover
White clover leaves with brownish spots and some yellowing occurring at the margins.
Bacterial black leaf spot | Clover
DISEASE: Bacterial black leaf spot
HOST: Clover (Trifolium repens)
PATHOGEN: Burkholderia andropogonis
PATHOGEN SYNONYM: Pseudomonas andropogonis
SOURCE: R. Gitaitis
DISEASE: Bacterial blight (Leaf spot)
HOST: Clover
Diseased leaf with elongated, reddish brown lesions, especially numerous on the margins.
Bacterial blight (Leaf spot) | Clover
DISEASE: Bacterial blight (Leaf spot)
HOST: Clover (Trifolium alexandrinum)
PATHOGEN: Pseudomonas syringae pv. syringae
SOURCE: M. Shurtleff
DISEASE: Bacterial fasciation (Leafy gall)
HOST: Clover
Leafy gall on stem.
Bacterial fasciation (Leafy gall) | Clover
DISEASE: Bacterial fasciation (Leafy gall)
HOST: Clover (Melilotus officinalis)
PATHOGEN: Rhodococcus fascians
SOURCE: H. van Hoof, M. Geesteranus
DISEASE: Bacterial heart rot and fruit collapse
HOST: Pineapple
Infected leaf with olive green, puffy appearance.
Bacterial heart rot and fruit collapse | Pineapple
DISEASE: Bacterial heart rot and fruit collapse
HOST: Pineapple (Ananas comosus)
PATHOGEN: Dickeya sp.
PATHOGEN SYNONYM: Erwinia chrysanthemi
SOURCE: G. Taniguchi
DISEASE: Bacterial heart rot and fruit collapse
HOST: Pineapple
Advanced stage of heart rot. Note puffy appearance of discolored midportions of central heart leaves.
Bacterial heart rot and fruit collapse | Pineapple
DISEASE: Bacterial heart rot and fruit collapse
HOST: Pineapple (Ananas comosus)
PATHOGEN: Dickeya sp.
PATHOGEN SYNONYM: Erwinia chrysanthemi
SOURCE: C. V. Subere
DISEASE: Bacterial heart rot and fruit collapse
HOST: Pineapple
Dark, necrotic, decayed area at bases of central heart leaves. Advanced stage is characterized by an olive green leaf color and puffy appearance of midportions of leaves.
Bacterial heart rot and fruit collapse | Pineapple
DISEASE: Bacterial heart rot and fruit collapse
HOST: Pineapple (Ananas comosus)
PATHOGEN: Dickeya sp.
PATHOGEN SYNONYM: Erwinia chrysanthemi
SOURCE: K. Rohrbach
DISEASE: Bacterial heart rot and fruit collapse
HOST: Pineapple
Diseased plant with reddening of leaves, a symptom of the disease.
Bacterial heart rot and fruit collapse | Pineapple
DISEASE: Bacterial heart rot and fruit collapse
HOST: Pineapple (Ananas comosus)
PATHOGEN: Dickeya sp.
PATHOGEN SYNONYM: Erwinia chrysanthemi
SOURCE: G. Taniguchi