New cottons must be developed to meet the needs for the cotton producer and the demands of the textile industry. Tests were conducted over a 2-year period at 12 locations in Texas. Simultaneous genetic improvement in yield potential, fiber quality traits, and resistance to pests from the MAR-1 to the MAR-6 germplasm has been Quantified. New elite MAR-6 strains with the desired traits have been identified. These strains are CAHUGARPIH-1-88, CABD3CABCH-1-89, CD3HCHULBH-1-89 and CD3PIHP45H--89. The negative association or linkage between high lint yield and fiber strength has been broken through modified intermating and selection utilizing the MAR procedures. The increase in fiber strength from MAR-1 to MAR-6 was 4.7 g/tex (0%). Further progressive improvements in yield potential, fiber quality, and resistance to biotic and abiotic stresses can be made in the MAR germplasm.