Review and status of rapeseed and mustard diseases research in Nepal
2001
Chaudhary, R.N.( National Oilseed Research Program, Nawalpur, Sarlahi (Nepal))
Plant pathological research works in rapeseed and mustard was probably started during 1984/85 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 a 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. Alternaria 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 and 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. Until varieties 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 the fungicide Rovral (Iprodion 50 WP) over Dithiocarbamates in controlling Alternaria blight has been established.
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