RESULTS

(3)

FILTER

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: Deep bark canker

HOST: Walnut

Pits in the wood and black streaks in inner bark are key diagnostic symptoms.

Deep bark canker | Walnut

DISEASE: Deep bark canker

HOST: Walnut (Juglans regia)

PATHOGEN: Brenneria rubrifaciens

PATHOGEN SYNONYM: Erwinia rubrifaciens

SOURCE: N. Schaad, M. Schroth

DISEASE: Fire blight

HOST: Pear

Blossom blight is first seen as water-soaked spots that rapidly turn brown to black as the disease becomes systemic and progresses down the shoot.

Fire blight | Pear

DISEASE: Fire blight

HOST: Pear (Pyrus communis)

PATHOGEN: Erwinia amylovora

SOURCE: S. Thomson