PGRFA

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The Disease:  BACTERIAL LEAF BLIGHT
Pathogen:
Xanthomonas oryzae pv. oryzae (Ishiyama 1922, Dye 1978, Dye et al 1980)

Etymology: from Greek xanthus, yellow; monas, unit; oryza rice
Disease:
Bacterial blight is one of the most destructive rice diseases in Asia. It occurs in China, Korea, India, Indonesia, Philippines, Sri Lanka, Taiwan, Thailand, and Vietnam. The disease also occurs in Northern Australia and Africa.
Symptoms:
In the tropics, bacterial blight exhibits three distinct symptoms.

Leaf blight symptom is the most common manifestation seen in the farmer's field. Water-soaked stripes appear a few centimeters below the leaf tip, on the margin of the leaf blade. Stripes enlarge and turn yellow within a few days. They have wavy margins. One or both leaf margins may have lesions. As the disease progresses, lesions cover the whole leaf and the leaf turns white to gray with an overgrowth of saprophytic fungi.

Appearance:

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Last Updated on Wednesday, 15 April 2009 08:16