Plant pathological research  works  in rapeseed and mustard  was probably started during 1984/85  (BS 2041/42)  at National Oilseed Research Program Nawalpur,  Sarlahi with the deputation  of a plant protection officer on permanent basis.  Researches.on  rapeseed and mustard  diseases have been carried out at National Oilseed Research Program, Nawalpur with  over  all objectives of identifying  resistant  and tolerant  varieties for  major  diseases from  exotic  and  local  land  races. The  research  work  on  host  plant resistance,  seed pathology,  cultural  and  chemical  methods  of disease control have  been highlighted.  In addition,  survey,  surveillance,  and  estimation  of yields  loss  due to  diseases have  been carried out  to provide  basic information in devising integrated control strategies for the management of the diseases of economic importance. Altemaria blight in rapeseed and mustard  has  been  continued  to  be number  one  disease  and  identified  as  major yield limiting  constraint. During  last one-decade major research emphasis  has been placed on evaluation  of resistant germplasms of rapeseed & mustard against Alternaria blight and on chemical  method  of its control  Until now,  none  of varieties and germplasms  of tori and yellow sarson have shown resistance/tolerance to Alternaria blight over locations and years under  terai  and  inner  terai  environment.  However,  some  mustard  lines  have  shown moderately resistance to this disease. Untilvarieties resistant to Alternaria  blight would be available,  the  disease  control  strategy  would  depend  on  the  integrated  use  of early maturing  or disease escape and on chemical control methods  at large. Superiority  of tlze fungicide Rovral (Iprodion  50 WP) over Dithiocarbamates  in controlling Alternaria blight has been established.

Plant pathological research  works  in rapeseed and mustard  was probably started during 1984/85  (BS 2041/42)  at National Oilseed Research Program Nawalpur,  Sarlahi with the deputation  of a plant protection officer on permanent basis.  Researches.on  rapeseed and mustard  diseases have been carried out at National Oilseed Research Program, Nawalpur with  over  all objectives of identifying  resistant  and tolerant  varieties for  major  diseases from  exotic  and  local  land  races. The  research  work  on  host  plant resistance,  seed pathology,  cultural  and  chemical  methods  of disease control have  been highlighted.  In addition,  survey,  surveillance,  and  estimation  of yields  loss  due to  diseases have  been carried out  to provide  basic information in devising integrated control strategies for the management of the diseases of economic importance. Altemaria blight in rapeseed and mustard  has  been  continued  to  be number  one  disease  and  identified  as  major yield limiting  constraint. During  last one-decade major research emphasis  has been placed on evaluation  of resistant germplasms of rapeseed & mustard against Alternaria blight and on chemical  method  of its control  Until now,  none  of varieties and germplasms  of tori and yellow sarson have shown resistance/tolerance to Alternaria blight over locations and years under  terai  and  inner  terai  environment.  However,  some  mustard  lines  have  shown moderately resistance to this disease. Untilvarieties resistant to Alternaria  blight would be available,  the  disease  control  strategy  would  depend  on  the  integrated  use  of early maturing  or disease escape and on chemical control methods  at large. Superiority  of tlze fungicide Rovral (Iprodion  50 WP) over Dithiocarbamates  in controlling Alternaria blight has been established.