Root rot can be caused by a variety of different fungi, and it can affect trees, shrubs, and plants. The most important disease of woody dicotyledonous plants in Arizona is Phymatotrichopsis root rot (Cotton or Texas root rot) caused by a unique and widely distributed soil-borne fungus, Phymatotrichopsis omnivora. Phymatotrichum root rot, also known as cotton root rot and Texas root rot, is caused by the fungus Phymatotrichopsis ominvorum. The fungus is indigenous to the alkaline, low-organic matter soils of the southwestern United States and central and northern Mexico. For example, cotton root rot fungi from cotton can infect apple trees. Outside of Texas, when this infection strikes a pecan tree or other plant, Texas root rot is the more common name. Cotton root rot in pecan trees is a devastating disease and silent killer. Root rot is a disease that attacks the roots of trees growing in wet or damp soil. Even worse – the resting structures of the fungus survive for many years in soil more than 12 feet deep. What is this deadly disease? This decaying disease can cut the life short of just about any type of tree or plant and has symptoms similar to other diseases and pest problems, like poor growth, wilted leaves, early leaf drop, branch dieback, and eventual death. Topguard Terra fungicide can be applied to cotton fields via T-band, modified in-furrow and drip irrigation for maximum application flexibility. There are no known reliable control methods for this disease, and the difficulty in its management is most often directed at its survival deep in soils and its wide host range. Specifically formulated for cotton, it results in higher yields, better grades and improved harvesting efficiency. What is Pecan Cotton Root Rot? Typically, one of the main triggers is over-watering, leading to too much moisture around the roots of the plant. Phymatotrichopsis root rot (PRR), caused by the fungus Phymatotrichopsis omnivora, is a major disease in many of the cotton production areas of Texas and other southwestern states. Cotton root rot (Phymatotrichum omnivorum) affects more then 2,000 plant species, according to Texas A&M University. It is easily recognized in infested cotton fields in late summer by large areas of dead plants, hence its common name. It is most common in the low desert areas where winters are mild, but also occurs at higher elevations, up to at least 5000 ft, where susceptible This is a particular problem, since many housing tracts in the southwest are located on old cotton or alfalfa fields. This disease is one of the most destructive plant disease organisms. Outside of our state, the disease is known as Texas root rot. Phymatortrichum omnivorum, or cotton root rot, does not discriminate and can attack more than 2,000 species of plants. Cotton Root Rot occurs throughout the southwestern United States and Mexico. Cotton root rot, caused by Phymatotrichopsis omnivora, is the most destructive disease of dicotyledonous plants in Arizona. You can commonly find it in southwestern United States, Mexico, and some areas in the south-central US. The fungus thrives in clay loam soil conditions where pH is between 7.0 to 8.5. If you have one or more pecan trees, be aware of this infection. For control of cotton root rot, there's only one choice—Topguard Terra fungicide. The disease is economically important to cotton, alfalfa, peanut, ornamental shrubs, and fruit, nut and shade trees. How to Tell if Your Tree has Cotton Root Rot The wilting of cotton plants is the first visible symptom of this disease and in severe cases complete defoliation or collapse may happen as a result. 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