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Root rot

This threatening vine disease (also fall-over disease) is caused by various fungi occurring either singly or also in combination. The most common are Armillaria mellea (Hallimasch or hedge fungus), Roesleria hypogaea and Rosellinia necatrix. The vines show a whitish cover under the bark on the lower parts and the root (mycelial plaques = area of fungal threads). These occur especially in vineyards with former trees. The vines gradually die or even die quite suddenly (see also under apoplexy). Rotting of the roots can also be caused or encouraged by excessively moist soil (moisture stress) and animal pests such as phylloxera and larvae of root flies, as the fungi and also other harmful substances such as bacteria can easily penetrate at the feeding sites. The fungi are combated by fumigation. In the case of waterlogging, root mould (Dematophora necatrix) can also occur. A specific form is Cylindrocarpon root rot (Cylindrocarpon canker). See also a list of all diseases and pests under Vine Enemies.

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