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RESULTS

(8)

DISEASE: Bacterial decline

HOST: Papaya

Bacterial decline of papaya, historically called St. Croix decline, was thought to be caused by a fungus. This picture shows a papaya with dead top and side branches, a severe stage of the disease.

DISEASE: Bacterial decline

HOST: Papaya

Water-soaked papaya stem in St. Croix. Dark, water-soaked, greasy lesions occur on stems and leaves. The causal agent differs somewhat from descriptions of Erwinia papayae D strains in Micronesia.

DISEASE: Bacterial decline

HOST: Papaya

Bacterial invasion of leaf veins and adjacent tissues of papaya in Micronesia. This disease has also been called canker, dieback, and blight.

DISEASE: Bacterial decline

HOST: Papaya

Complete destruction of papaya plantation in Micronesia. Only a severely damaged trunk remains.

DISEASE: Head rot (Jelly rot)

HOST: Lettuce

Sliced head of lettuce. Typical symptoms are a translucent appearance and browning or jelly rot of the stalk (crown).

DISEASE: Head rot (Jelly rot)

HOST: Lettuce

Advanced stage of lettuce stalk rot (crown).

DISEASE: Head rot (Jelly rot)

HOST: Lettuce

Head rot of lettuce first appears as rapid wilt of outer wrapper leaves. Wilt is caused by collapse of vascular tissues, which develop a pinkish to brown discoloration.

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.