Tuberosities

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Term (tuberous = tumour-like) for cancerous, scab-like, elongated malformations on plants such as grapevines. They form on older 2- to 3-year-old roots. All grapevine species that are not resistant to phylloxera react with tissue growths in the form of tuberosities and nodosities (knots on young, non-lignified roots) after being infected. In contrast to nodosities, tuberosities are much more dangerous.

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.

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Tuberosities

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Tuberosities

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