• The Disease was first observed in Japan(1884)
• Yield losses—as high as 50%
• Sambha mahsuri, Taichung Native 1
• The bacterium induces either wilting of plants or
leaf blight
• The bacterium has many strains that differ in
ability to infect rice plants. Strains in tropical
countries are usually more virulent than those in
temperate areas like Japan.
-bacterium enters the plant through water
pores (hydathodes)
-through injuries in roots or leaves.
-does not enters through the stomata.
=Rainstorm help in the spread of the disease.
=Bacteria may survive in soil ,plant stubbles and
debris
=The Pathogen also survives on collateral host.
• -clipping of tip of the seedling at the time of transplanting
• Heavy rain
• Flooding
• Deep irrigation
• Severe wind,
• Temperature of 25-30 degree Celsius.
• Application of excessive nitrogen
MANAGEMENT
• –Grow resistant cultivars
• Affected stubbles are to be destroyed
• Judicious use of nitrogenous fertilizers
• Avoid flooded conditions
• Remove and destroy weed hosts.
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