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RESULTS

(18)

DISEASE: Australian citrus dieback

HOST: Citrus (Grapefruit)

Leaves with mottled chlorosis.

DISEASE: Australian citrus dieback

HOST: Citrus (Grapefruit)

Late stage of disease. Note yellowing of leaf veins and entire leaves.

DISEASE: Australian citrus dieback

HOST: Citrus (Lime)

Severe decline, a late stage of disease. The disease spreads slowly in mature trees, progressing faster in young trees.

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 canker

HOST: Citrus (Grapefruit)

Grapefruit with corky, raised lesions.

DISEASE: Citrus canker

HOST: Citrus (Lemon)

Lower leaf with raised, corkylike lesions surrounded by dark brown halos, one of the diagnostic symptoms of citrus canker.

DISEASE: Citrus canker

HOST: Citrus (Orange)

Leaf with leaf miner tunnels and numerous cankerlike lesions.

DISEASE: Citrus canker

HOST: Citrus (Orange)

Upper side of leaves with corky, raised lesions surrounded by yellow halos, a late stage of disease. Such infections usually are visible on lower sides of leaves first and soon after on upper sides.