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RESULTS

(13)

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.

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.

DISEASE: Bacterial stripe

HOST: Bird-of-Paradise

Bird-of-paradise with brownish black stripes along leaf veins and decay at midrib.

DISEASE: Bacterial wilt

HOST: Bird-of-Paradise

Bird-of-paradise with wilted and dead leaves.

DISEASE: Bacterial wilt

HOST: Bird-of-Paradise

Bird-of-paradise (sliced section) with rotted stele in diseased rhizome. Note discolored vascular bundles of leaf petioles.

DISEASE: Bacterial wilt

HOST: Squash

Field with severe symptoms of wilt. Foliage often is chlorotic and leaf margins may be chlorotic and necrotic before plant death. Bacterial ooze may be seen streaming from the xylem when infected stems are cut.

DISEASE: Blister spot

HOST: Apple

Fruit with water-soaked spots.

DISEASE: Blister spot

HOST: Apple

Water-soaked blister spots on leaves of blighted twig.

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".