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RESULTS

(16)

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: Marginal leaf blight

HOST: Lettuce

Marginal leaf blight first appears as slimy wilting of leaf margins. Small, reddish lesions may be seen on leaf blades. Infected tissues turn brown to black in time.

DISEASE: Witches'-broom

HOST: Alfalfa

Alfalfa plant (center) exhibiting stunting and proliferation of stems. Other symptoms are small, rounded, chlorotic, often puckered leaves and a yellowish cast.

DISEASE: Witches'-broom

HOST: Alfalfa

Young plant (left) with small, numerous stems (witches'-broom). Healthy stems (right).

DISEASE: Witches'-broom

HOST: Cactus

Witches'-broom of Opuntia cactus.

DISEASE: Witches'-broom

HOST: Citrus (Lime)

Lime tree with compact, small leaves (witches'-broom). Leaves on older brooms dry out and eventually drop, leaving dead, bare branches. There are no flowers or fruit on brooms.