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RESULTS

(10)

DISEASE: Alfalfa dwarf

HOST: Alfalfa

Alfalfa dwarf is characterized by stunted plants (left), usually dark blue-green in color. Xylem tissues become brown, especially when exposed to air.

DISEASE: Bacterial foot rot

HOST: Rice

The disease causes sheaths to turn dark brown and rot; dead leaves droop. Nodes, culms, and crowns also decay, and infected tillers are easily detached from the crown. Culms and internodes turn black.

DISEASE: Bacterial foot rot

HOST: Rice

Decayed culms (right) and healthy culms (left). Leaf sheaths of infected plants exhibit dark brown decay and attached leaves turn yellow and wilt.

DISEASE: Citrus variegated chlorosis

HOST: Citrus (sp. unknown)

Leaf with chlorosis in interveinal spaces and brown spots visible on lower leaf surface.

DISEASE: Citrus variegated chlorosis

HOST: Citrus (sp. unknown)

Interveinal chlorosis on upper side of leaves.

DISEASE: Citrus variegated chlorosis

HOST: Citrus (sp. unknown)

Leafhopper (Oncometopia nigricans) vector of Xylella fastidiosa, which transmits citrus variegated chlorosis.

DISEASE: Citrus variegated chlorosis

HOST: Citrus (Orange)

Small, hard, diseased fruit interspersed with three normal fruits for comparison. Diseased fruit often exhibit sunburn symptoms.

DISEASE: Citrus variegated chlorosis

HOST: Citrus (Orange)

Diseased tree with sparse foliage.

DISEASE: Citrus variegated chlorosis

HOST: Citrus (Orange)

Typical symptoms of the disease are discoloration of infected leaves, brown spots on lower sides of leaves, chlorosis on upper sides, and undersized fruit (left). Healthy fruit and leaves (right).