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Nodosities

Term (nodose = nodular) for gall-like, yellowish, 2 to 4 millimetre nodules in a bird's beak shape on plants, as can also occur on grapevines. They form on the young, still non-woody roots. All grapevine species that are not resistant to phylloxera react to an attack by the pest with tissue growth in the form of nodosities and tuberosities (growths on older roots).

Nodositäten - Wurzeln

A phylloxera infestation can impair the growth, function and performance of the roots due to the stress situation and, as a secondary effect, favour infestation with microorganisms such as bacteria and viruses. In addition, swelling after secondary infestation with fungi can turn into rot and lead to the death of the roots. However, nodosities are generally relatively harmless compared to the more dangerous tuberosities.

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