The take-all fungus, Gaeumannomyces graminis (ascomycota), is a major root-rot pathogen of cereals and grasses. All varieties of wheat and barley are susceptible. It is an important disease in winter wheat particularly, and is favoured by conditions of intensive production and monoculture. It survives in the soil on infected residues of one crop, then invades the roots of the following crop, progressively destroying the root system. In exceptional cases it can kill the whole crop; hence the name "take-all".

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