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Texas root red

The "Texas root rot" (also Phymatotrichopsis root rot or ozonium root rot) is in Mexico and in the southwest of the United States widespread. The disease was first discovered in 1888. It is caused by the soil fungus "Phymatotrichum omnivora", which attacks the roots of plants. This thrives especially on alkaline and calcareous soils in warm and humid weather. First disease symptoms are common chlorosis on the leaves. Subsequently, the leaves brown and wither. After two weeks of the first symptoms, the plant finally dies. On infected root tissue striking, uniformly branched hyphae are to be found (picture left). In the vineyard form the infested vines with withered leaves seen from above single circles. The fight takes place with fungicides, See also below Vine enemies,

Texas root red - mushroom Phymatotrichopsis omnivora and symptoms in the vineyard

Picture left: By Dr Jose R. Liberato - pests and diseases , CC BY 3.0 au , Link
Picture right: extension

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