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RESULTS

(7)

DISEASE: Common scab (Potato scab)

HOST: Potato

Symptoms of common scab vary depending upon the cultivar. The lesions can be shallow or deep, erumpent and corky, and vary in color.

DISEASE: Common scab (Potato scab)

HOST: Potato

White-skinned tuber with sunken and superficial scab lesions.

DISEASE: Common scab (Potato scab)

HOST: Potato

Red-skinned tuber with lesions that usually penetrate less than 1 mm.

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: Syringae leaf spot

HOST: Tomato

Leaves with brown necrotic lesions and chlorotic margins. Symptoms vary greatly among cultivars. Some have black or brown lesions with bright yellow, chlorotic areas and others do not have yellowing.