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Texas root rot (also known as cotton root rot) is a pathogen fairly common in Mexico and the southwestern United States that causes sudden wilt and death of affected plants, usually during the warmer months. It is a soil-borne fungus of the species Phymatotrichopsis omnivora that attacks the roots of susceptible plants. Because the damaged roots are unable to take up enough water to maintain the plant in warm weather, the leaves wilt and the plant dies. The dead leaves usually remain attached to the plant.