Caused by numerous Pythium species that can infect wheat at almost any stage of growth. Field symptoms are similar to common root rot, but infections by Pythium is favored by wet soil conditions and usually more uniform on field basis. Infected root tips exhibit a yellowish- brown color and possess few root hairs. Severely infected roots often break when pulling up a plant, leaving a necrotic stub. Maturity of infected plants is often delayed. Wheat straw left on or near the soil surface by minimum or no-till practices favor development of Pythium root rot. Old seed stocks are more vulnerable to infection.