Texas root red

Texas root rot" (also known as Phymatotrichopsis root rot or ozonium root rot) is widespread in Mexico and the southwestern USA. The disease was first discovered in 1888. It is caused by the soil fungus "Phymatotrichum omnivora", which attacks the roots of plants. This fungus thrives especially on alkaline and calcareous soils in warm and humid weather. The first symptoms of the disease are often chlorosis on the leaves. The leaves then turn brown and wither. After two weeks of the first symptoms, the plant finally dies. Striking, uniformly branched hyphae can be found on infected root tissue (left picture). In the vineyard, the infected vines with withered leaves form individual circles when viewed from above. Fungicides are used for control. See also under vine enemies.

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Texas root red

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