Tamcot Sphinx cotton (Gossypium hirsutum L.) was developed in the Texas Multi-Adversity Resistance (MAR) Genetic Improvement Program and released in 1995 by the Texas Agricultural Experiment Station. The MAR program uses techniques and selection procedures for the simultaneous genetic improvement of resistance to pests (insects and plant pathogens) and abiotic stresses, in addition to improving yield, earliness, and fiber and seed quality (2,4).