Resistance to bacterial blight and Rhizoctonia solani has been obtained from a set of high tannin 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 two resistant controls, Tamcot Sphinx and Stoneville 213 and one susceptible control, Sure Grow 747, were grown in test tubes containing soil inoculated with oospores of Pythium aphanidermatum. After one week of incubation at 30 ºC the number of surviving seedlings was recorded. Five lines, TAM 87 N5, TAM 87 N6, TAM 87 N7, TAM 86 E8 and TAM III 26, had resistance scores greater than that of Tamcot Sphinx (Stoneville 213 did not perform as well as was expected, possibly due to issues with seed quality). Two other lines TAM 86 III11 and TAM 86 III8 had resistance scores equal to that of the resistant control. Tannin levels in the seed were measured in October 2006 to determine if resistance is correlated with tannin levels. Tannin content had previously only been measured in the mature leaves.