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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: Bacterial pustule

HOST: Soybean

Early symptoms are minute, pale green spots on young leaves. Later, small pustules form in the center of spots, best observed on underside of leaves. Spots vary in size and darken with age and lesions coalesce. Dead areas are torn away by wind.

DISEASE: Blood disease

HOST: Banana

Yellow leaves of dying plant.

DISEASE: Blood disease

HOST: Banana

Cross sections of diseased fruit with reddish discoloration and bacterial ooze.

DISEASE: Blood disease

HOST: Banana

Longitudinal sections (right) exposing reddish brown discoloration of infected fruit.

DISEASE: Blood disease

HOST: Banana

Diseased plant with wilt and yellowing of leaves. The disease occurs in Indonesia and is characterized by bright red discoloration of vascular tissues. It is caused by strains in the Ralstonia solanacearum species complex.