Abstract: A survey of tomato ant pepper viruses was conducted in Sudan during the last ten years. It covered Central , Northern, Eastern, South- eastern and Western region of SLidan. The results revealed the presence of many mosaic - inducing virus and virus like agents. Cucumber mosaic virus (CMV), tomato mosaic virus (ToMV), tobacco mosaic virus (TMV), Tomato yellow leaf curl virus (TYLCV) and potato virus Y ( PVY) were all found to infect both tomato and pepper. Tomato was found to be severely affected by a previously undescribed poty- like virus and a ` viroid`. The identity of these viruses and viroids was confirmed through the use of various biological, serological and electron microscopy techniques, as well as through hybridization assay for `viroids`. Tomato mosaic virus appeared to be more destructive and more widely distributed on tomato and pepper. According to symptornatology on differential host plants and different tomato genotypes, as well as serological tests, the udanese isolates were classified as - Pathtype Zero " (PO). The results have shown that CMV was the major virus infecting pepper, in comparison with the low rates of the virus on tomato. According to biological and serological tests, most of the Sudanese isolates were classified as thermoresistant isolates (DTLSLibgroupl).