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RESULTS

(13)

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: Hollow stalk

HOST: Tobacco

Hollow stalk may appear at time of topping and suckering. Top leaves wilt and the stalk becomes bare as the disease moves downward.

DISEASE: Hollow stalk

HOST: Tobacco

Infection of flue-cured tobacco stalks occur at wound sites caused by topping. After top infection, browning of pith occurs and tissues rot.

DISEASE: Lethal yellowing

HOST: Palm

Palm with dark necrotic inflorescence.

DISEASE: Lethal yellowing

HOST: Palm

Palm with close-up of diseased yellow spear leaf.

DISEASE: Lethal yellowing

HOST: Palm

Progression of lethal yellowing symptoms. Older fronds of coconut palm turn yellow, followed by yellowing of younger ones near center of crown.

DISEASE: Lethal yellowing

HOST: Palm

Coconut palm with yellowing and desiccation of leaves, late stage of disease.

DISEASE: Lethal yellowing

HOST: Palm

Palms near death, noted by yellow fronds, some that have dehisced.