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Bacterial leaf blight (Xanthomonas oryzae pv. oryzae)

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Greenish-yellow strips appear along the leaf margins and extend both lengthwise and breadthwise. The leaf starts drying from the tip, becomes white in severe cases and dries up completely. The disease sometimes attacks the freshly transplanted seedlings which start wilting and in a few days the whole clump dries up. The bacterium perpetuates through seed, rice straw, and roots of non-host plants during the off-season. In order to mitigate the losses, adopt the following measures :
(i) For the management of bacterial leaf blight, grow rice varieties PR 120, PR 115, PR 113 and PR 111 which are resistant to some of the pathotypes of the bacterial leaf blight pathogen.
(ii) Do not apply excessive dose of nitrogen. Nitrogen should not be applied beyond six weeks after transplanting (except when LCC is used).
(iii) Do not pond water in the field.
(iv) Treat seed before sowing to kill primary inoculum, see “Seed Treatment” under Agronomy Practices.
(v) (a) Do not grow nursery under shade.
(b) Rice crop itself should not be grown in the shady area.
(vi) The growing of rice in the area near Bhusa stack (Kup) should be avoided

File Courtesy: 
Punjab Agricultural University, Ludhiana
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