Resistance to bacterial blight has been obtained from high tannin cotton lines. In an effort to see if tannin levels might play a role in resistance to other cottons seedling disease pathogens 33 cotton lines containing elevated levels of condensed tannins were evaluated for their level of resistance to Rhizoctonia solani. The high tannin lines were from a set of cotton germplasm lines released by C W Smith, M F Schuster and G A Niles from the Texas Agricultural Experiment Station in 1989. Seeds of each high tannin line plus a resistant and a susceptible control, Tamcot SP 21 and TAM 96WD-18 respectively, were grown at 27 ºC for three days. Plants were inoculated with Rhizoctonia and allowed to grow in the greenhouse for seven days, and the number of surviving plants recorded. Four lines that appeared to be more resistant in preliminary screens, TAM 86 III 16, TAM 86 J 1, TAM 86 III 11 and TAM 86 III 24, were inoculated with approximately four times the normal inoculum concentration. Approximately 5% of each line survived this level of inoculum. Seeds were produced and re-screened in November 2005 to determine the level of resistance after one cycle of selection.