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RESULTS

(9)

DISEASE: Bacterial blast and black pit

HOST: Citrus (Lemon)

The term "black pit" refers to black lesions on fruit, which may be specks or large, sunken pits as seen here. They also may be light tan, later becoming reddish brown to black.

DISEASE: Bacterial blast and black pit

HOST: Citrus (Lime)

Characteristic symptoms of brownish black lesions on twigs and leaves (blast), starting with infection of petioles. Black pit refers to brown to black sunken spots on fruit, 5 to 20 mm in diameter.

DISEASE: Pear decline

HOST: Pear

Healthy pear shoot (left) and diseased shoots (center and right). Leaves are reddish and growth is stunted.

DISEASE: Pear decline

HOST: Pear

Close-up of infected pear branch showing premature reddish coloration of leaves and cupped, stunted leaves.

DISEASE: Pear decline

HOST: Pear

Reduced growth of infected trees in center of image.

DISEASE: Pear decline

HOST: Pear

Psylla pyricola, the psyllid vector of pear decline phytoplasma.

DISEASE: Pear decline

HOST: Pear

'Bartlett' pears were grafted onto tolerant rootstock. All trees are infected. Note yellowish, diseased branches.

DISEASE: Pink disease

HOST: Pineapple

Infected pineapple slices; effect of heating (right) and not heating (left).

DISEASE: Pink disease

HOST: Pineapple

Two clones (A and D) showing different stages of infection. Second and fourth fruits (left to right) have been heated. Disease originally attributed to Gluconobacter oxydans and Enterobacter agglomerans and later to Pantoea citrea.