PGRFA

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The Disease:  BACTERIAL SHEATH ROT
Pathogen:
Pseudomonas syringae pv syringae van Hall. (Syn P. oryzicola Klement)

Etymology: from Greek pseudes, false; monas, unit; syringae from Syringa, generic name of lilac
Disease:
Bacterial sheath rot was first reported by Klement (1955) in Hungary as a new bacterial rice disease affecting the panicle leaf sheath. Bacterial sheath rot occurs now in rice-growing continents and seems to have worldwide distribution. The causal bacterium may be present simultaneously with other Pseudomonas spp.
Symptoms:
The infected panicle sheath develops brown lesions which later rot and cause the panicle to dry. The stem and nodes may develop blurred spots which turn brown or black (Ou 1985). Grains become discolored. Spikelets of infected panicles become sterile.

Appearance:

b Colony of Pseudomonas syringae
Last Updated on Monday, 13 July 2009 03:26