A delay in infection of cotton is readily apparent and has resulted in up to 90 percent reduction in rootrot. Wheat, oats, and other cereal crops are effective in delaying infection and reducing losses when incorporated in soil in the spring before cotton is planted. Phymatotrichopsis root rot (also known as cotton rootrot, Phymatotrichum root rot, Texas root rot and Ozonium root rot) is a major fungal disease of cotton occurring within large areas of Texas and Arizona, causing annual losses in Texas alone of up to $29 million. Cotton rootrot is a serious soilborne fungal disease of cotton and numerous dicot plants in the south-western United States and northern Mexico. The disease is also known as Texas root rot, Phymatotrichopsis or Phymatotrichum root rot, and Ozonium root rot. Symptoms of Phymatotrichum root rot occur most often from June through September after soil temperatures reach 82 F. In row crops, symptoms appear as patches of wilted plants, which rapidly die. Trees and shrubs may die more slowly. The leaves of affected plants dry, turn brown, and remain attached to the plant. Affected areas expand to form circul...See full list on extension.okstate.eduThe fungus survives almost indefinitely in the soil as small (1 to 5 mm in diameter), resistant, seed-like structures called sclerotia. Sclerotia have been recovered from soil at depths of up to 8 feet. In the summer, mycelium from germinating sclerotia or from fungal fragments overwintering on roots of perennial plants infects nearby roots. The fu...See full list on extension.okstate.eduAlthough there are several management practices available that help reduce the occurrence and severity of this disease, none are highly effective. Attempts to control the disease with fungicides and soil fumigation have not been successful. The most effective strategy is to define areas infested with the fungus and plant crops and plant species tha...See full list on extension.okstate.eduSep 9, 2025 · For experienced producers familiar with scouting thresholds and varietal tolerances, effective cotton rootrot management hinges on integrating cultural practices, resistant hybrids, and targeted interventions to preserve root integrity during squaring and boll fill. Make ornamental plantings of cotton rootrot-susceptible species with isolated plants or groups of plants rather than in continuous rows as hedges. When the disease occurs in an ornamental planting, replace diseased plants with resistant species. Phymatotrichum rootrot (PRR) is one of the most destructive diseases of cotton (Gossypium spp.) and alfalfa (Medicago sativa), the most important source of natural fibre and one of the most important forage crops, respectively. · For experienced producers familiar with scouting thresholds and varietal tolerances, effective cotton rootrot management hinges on integrating cultural practices, resistant hybrids, and targeted interventions to preserve root integrity during squaring and boll fill. Phymatotrichum rootrot (PRR) is one of the most destructive diseases of cotton (Gossypium spp.) and alfalfa (Medicago sativa), the most important source of natural fibre and one of the most important forage crops, respectively. Choose from a wide range of gardening supplies and accessories at Amazon. Read customer reviews & find best sellers. Free, easy returns on millions of items. Make ornamental plantings of cotton rootrot-susceptible species with isolated plants or groups of plants rather than in continuous rows as hedges. When the disease occurs in an ornamental planting, replace diseased plants with resistant species.
