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RESULTS

(9)

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: Purple stain

HOST: Papaya

Purple pigmentation of internal tissues near peduncle end of fruits. Pigmentation and yellow translucence of papaya flesh are more evident of fruit on right.

DISEASE: Purple stain

HOST: Papaya

Purple pigmentation of internal tissues.

DISEASE: Purple stain

HOST: Papaya

Another view of purple discoloration at peduncle end. Bacteria are found in vascular tissues and latex ducts.

DISEASE: Purple stain

HOST: Papaya

Cross section of fruit exhibiting purplish discoloration in latex ducts.

DISEASE: Strawberry lethal decline

HOST: Strawberry

Diseased plant with bronzing of older leaves and upward rolling or cupping of younger leaves. Leaves are chlorotic on upper surfaces and reddish or purplish on lower surfaces. In time, the entire plant dies.