Pathogens Associated with Cotton Seedling Diseases on the Southern High Plains of Texas

J. Mertely, J. Gannaway, and H. Kaufman


During 1993, root and foliar pathogens of seedling cotton were examined from five farms located within a 100 km radius of Lubbock, Texas. The root systems of 14-21 day-old Paymaster HS-26 seedlings were excavated from black seed control plots in an experiment replicated on three farms. Forty root systems from each farm were rated for disease severity on a scale of 1 (healthy) to 5 (totally discolored or necrotic). Isolations were made from the tap roots of 72-96 plants per farm onto three media--water agar amended with 100 µg/ml streptomycin sulfate, P(10)ARP selective for Pythium and Phytophthora spp. (2), or TB-CEN selective for Thielaviopsis basicola (3).

Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences pg. 246
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998