This experiment will be sit at the University of Arkansas' farm in Fayetteville, Arkansas. A soil from Clarkedale, Arkansas, with a long history of cotton monoculture would be used in this study to make four different artificial soil textures by addition of sand in proportions of 100:05; 100: 25; 100:50 and 100:200 (soil: sand, respectively). Soil samples would be taken to make texture and fertilization analysis. Soils will be steam pasteurized for 0.5 h at 60°C to eliminate potential cotton pathogens. Six treatments and four repetitions by treatment will be used to determinate the influence of the soil texture on the reproduction and damage severity of Meloidogyne incognita and Thielaviopsis basicola. These treatments would be: 1) uninfected control; 2) M. incognita - 4 eggs/cc soil; 3) M. incognita - 8 eggs/cc soil; 4) T. basicola – 20 chlamydospores chains/g soil; 5) M. incognita - 4 eggs/cc soil T. basicola – 20 chlamydospores chains/g soil; and 6) M. incognita - 8 eggs/cc soil T. basicola – 20 chlamydospores chains/g soil.