Rice   diseases   are   the   major   problem   for   rice   production   and   blast   is   one   of  them. Development  of the  resistance  varieties  instead  of using chemical  and botanicals  to treat the rice blast disease in field  is most  important in Nepalese  context. Therefore,  identification of resistance rice accessions from Nepalese  rice germplasrn collection is very important for development  of blast  resistance  rice  varieties.  One  hundred  and  forty  four  Nepalese  rice landraces  were   screened   for  their  response   on  blast  pathogen   in   natural   condition   at Khumaltar, Lalitpur, Nepal.  Blast lesion type, disease severity, disease incidence and disease damage were  recorded  on 25  days  old  rice seedling.  Local  rice  varieties  Jumli  Marshi  and Masuli  were  used  as  susceptible  check whereas  Sabitri  was  used  as  resistant  check.  One hundred  and nine  rice  landraces  showed  resistance  reaction  with  blast.  Similarly,  sixty  four rice landraces  showed  no  blast disease symptom  during seedling stage.  Variation on origin  of rice  landraces  may  account  for  this  differential  reaction  in  blast  disease  development  at seedling stage. 

Rice   diseases   are   the   major   problem   for   rice   production   and   blast   is   one   of  them. Development  of the  resistance  varieties  instead  of using chemical  and botanicals  to treat the rice blast disease in field  is most  important in Nepalese  context. Therefore,  identification of resistance rice accessions from Nepalese  rice germplasrn collection is very important for development  of blast  resistance  rice  varieties.  One  hundred  and  forty  four  Nepalese  rice landraces  were   screened   for  their  response   on  blast  pathogen   in   natural   condition   at Khumaltar, Lalitpur, Nepal.  Blast lesion type, disease severity, disease incidence and disease damage were  recorded  on 25  days  old  rice seedling.  Local  rice  varieties  Jumli  Marshi  and Masuli  were  used  as  susceptible  check whereas  Sabitri  was  used  as  resistant  check.  One hundred  and nine  rice  landraces  showed  resistance  reaction  with  blast.  Similarly,  sixty  four rice landraces  showed  no  blast disease symptom  during seedling stage.  Variation on origin  of rice  landraces  may  account  for  this  differential  reaction  in  blast  disease  development  at seedling stage.