The new variety Bt.CIM-598 has been developed through intra-specific hybridization between CIM-446 and IR -CIM-448 at Central Cotton Research Institute, (CC RI) Multan. Th is variety gave significantly higher yield in varietal trials compared with the commercial varieties. Bt.CIM-598 was also evaluated in Zonal Varietal Trials at farmers’ fields and Gov ernment Farms. In these trials , Bt.CIM-598 gave 16.8% increase over commercial varieties IR-3701 for seed cotton yield. Bt.CIM-598 possesses higher ginning out turn percentage, better fibre qualities and spinning performance compared with all the existing commercial Bt. varieties. The entomological study showed the there in no boll worm damage through out the season and no bollworm larvae were found. This variety has also shown high tolerance to cotton leaf curl virus and sucking insect pests due to their profuse hairiness. The commercial cultivation of this virus tolerant and Genetically Modified (GM) cotton variety will significantly contribute to the overall cotton production. Key Words: Bt. cotton, CIM-598, CLCuV tolerant, high yielding, Gossypium hirsutum. Introduction Cotton which is called as 6F (food, fee d,
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