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RESULTS

(7)

DISEASE: Drippy nut disease

HOST: Oak

Ooze from young twig inoculated with Brenneria quercina.

DISEASE: Drippy nut disease

HOST: Oak

Ooze from infected acorn. Copious ooze drips from infected acorns, leaving sticky spots on objects under tree canopy. Infections are associated with insect oviposit wounds.

DISEASE: Pierce's disease

HOST: Grape

Leaves with bright yellow, chlorotic areas with dead, dry, necrotic adjacent tissues.

DISEASE: Pierce's disease

HOST: Grape

Early symptoms of Pierce's disease on leaves. Symptoms vary greatly among cultivars.

DISEASE: Pierce's disease

HOST: Grape

Late-season wood on diseased canes fail to mature, leaving green "islands" of tissue surrounded by dark brown, mature wood.

DISEASE: Varnish spot

HOST: Lettuce

Leaf with large brown and small, shiny, dark brown necrotic spots that spread in size and later dry out.

DISEASE: Varnish spot

HOST: Lettuce

Advanced stage of disease with large, brown necrotic areas. They most often are along veins. Outermost leaves of the head usually are not affected.