DISEASE: Apple proliferation
HOST: Apple
Spring form of the adult black-veined psyllid, Cacopsylla melanoneura, a vector of apple proliferation. In winter, adults are more greenish in color.
Apple proliferation | Apple
DISEASE: Apple proliferation
HOST: Apple (Malus domestica)
PATHOGEN: 'Candidatus Phytoplasma mali'
PATHOGEN SYNONYM: Phytoplasma Apple proliferation group
SOURCE: M. Wolf, W. Schweigkofler
DISEASE: Apple proliferation
HOST: Apple
Typical apple proliferation symptom of witches'-broom resulting from suppression of apical dominance and growth of dormant axillary buds. Branches are not usually bent down as shown here.
Apple proliferation | Apple
DISEASE: Apple proliferation
HOST: Apple (Malus domestica)
PATHOGEN: 'Candidatus Phytoplasma mali'
PATHOGEN SYNONYM: Phytoplasma Apple proliferation group
SOURCE: M. Wolf, W. Schweigkofler
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 fasciation (Leafy gall)
HOST: Daisy
Bacterial fasciation of daisy.
Bacterial fasciation (Leafy gall) | Daisy
DISEASE: Bacterial fasciation (Leafy gall)
HOST: Daisy (Leucanthemum maximum)
PATHOGEN: Rhodococcus fascians
SOURCE: R. Raabe
DISEASE: Bacterial fasciation (Leafy gall)
HOST: Daisy
Daisy with stem and leaf proliferation.
Bacterial fasciation (Leafy gall) | Daisy
DISEASE: Bacterial fasciation (Leafy gall)
HOST: Daisy (Leucanthemum maximum)
PATHOGEN: Rhodococcus fascians
SOURCE: M. Putnam
DISEASE: Blister spot
HOST: Apple
Fruit with water-soaked spots.
Blister spot | Apple
DISEASE: Blister spot
HOST: Apple (Malus domestica)
PATHOGEN: Pseudomonas syringae pv. papulans
SOURCE: T. Burr
DISEASE: Blister spot
HOST: Apple
Water-soaked blister spots on leaves of blighted twig.
Blister spot | Apple
DISEASE: Blister spot
HOST: Apple (Malus domestica)
PATHOGEN: Pseudomonas syringae pv. papulans
SOURCE: T. Burr
DISEASE: Blossom blast
HOST: Apple
Many dead, shriveled flowers and young shoots. It differs from fire blight, with infections being relatively localized with the appearance of being "blasted".
Blossom blast | Apple
DISEASE: Blossom blast
HOST: Apple (Malus domestica)
PATHOGEN: Pseudomonas syringae pv. syringae
SOURCE: M. Schroth