Rusts are highly destructive and are responsible for widespread epiphytotics all over the world. The cereal rusts, the white pine blister rust, cedar rust of apple, rust of linseed are known for their destructive nature. The rusts have pleomorphic life cycle. The cultivation of linseed is greatly handicapped by the incidence of rust in most of linseed (flax) growing areas in the world. In Asia the disease is of particular importance since linseed is one of the major oil seed crop. The crop is sown in October and November and harvested in March or April. The rust appear in February or so. Injury of crop results from the reduced amount of foliage and utilization of plant food reserve by the obligate parasite. The disease causes reduction in seed yield and weakening and disfiguring of fibre in flax. The pathogen occurs in Africa, Asia, Australia, Europe and North and South America. The present study is made to find out that due to infection how much loss occurs at various levels and how we suggested farmer to control about disease. This study represents statistically that various level of infection and subsequent loss due to rust of linseed.