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 Cotton Root Rot has different names such as Texas root rot, Phymatotrichum root rot, Phymatotrichopsis root rot, Ozonium root rot (in olden literature), Etc., It is a hazardous pathogen. Phymatotrichum root rot, also known as cotton root rot and Texas root rot, is caused by the fungus Phymatotrichopsis ominvorum. Cotton root rot, caused by Phymatotrichopsis omnivora, is the most destructive disease of dicotyledonous plants in Arizona. The fungus thrives in clay loam soil conditions where pH is between 7.0 to 8.5. Root rot can be caused by a variety of different fungi, and it can affect trees, shrubs, and plants. Typically, one of the main triggers is over-watering, leading to too much moisture around the roots of the plant. 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. In recent years, we have documented the effectiveness of a soil application of Topguard (flutriafol) to control this disease. Cotton root rot (Phymatotrichum omnivorum) affects more then 2,000 plant species, according to Texas A&M University. Specifically formulated for cotton, it results in higher yields, better grades and improved harvesting efficiency. The fungus attacks more than 2,000 species of broadleaf plants, but does not affect monocots (grasses). Outside of our state, the disease is known as Texas root rot. The disease is economically important to cotton, alfalfa, peanut, ornamental shrubs, and fruit, nut and shade trees. Even worse – the resting structures of the fungus survive for many years in soil more than 12 feet deep. The objective of this study was to identify For example, cotton root rot fungi from cotton can infect apple trees. Cotton root rot in pecan trees is a devastating disease and silent killer. 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. What is Pecan Cotton Root Rot? 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. Outside of Texas, when this infection strikes a pecan tree or other plant, Texas root rot is the more common name. 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. Cotton Root Rot occurs throughout the southwestern United States and Mexico. What is this deadly disease? If you have one or more pecan trees, be aware of this infection. Topguard Terra fungicide can be applied to cotton fields via T-band, modified in-furrow and drip irrigation for maximum application flexibility. It is easily recognized in infested cotton fields in late summer by large areas of dead plants, hence its common name. Root rot is a disease that attacks the roots of trees growing in wet or damp soil. You can commonly find it in southwestern United States, Mexico, and some areas in the south-central US. 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. How to Tell if Your Tree has Cotton Root Rot For control of cotton root rot, there's only one choice—Topguard Terra fungicide. Phymatortrichum omnivorum, or cotton root rot, does not discriminate and can attack more than 2,000 species of plants. 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