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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 leaf spot (Head rot)

HOST: Cauliflower

Leaves with tiny lesions surrounded by large halos.

DISEASE: Bacterial leaf spot (Head rot)

HOST: Cauliflower

Section of a cauliflower head with discolored, infected tissues.

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: Black rot

HOST: Cauliflower

Brown, necrotic, rotted areas on flower parts and typical V-shaped necrotic areas on leaf margins.

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".