You are using an old browser that may not function as expected.
For a better, safer browsing experience, please upgrade your browser.

Log in Become a Member


Term for cancerous, scabby and elongated deformities (tuberous = tumour-like), the formation of which is induced on the old (2 to 3-year-old) roots when attacked by phylloxera. They are much more dangerous than nodosities (tangles only on young roots). In the European grape varieties of the species Vitis vinifera (but also all other non-resistant species), the tuberosities penetrate through the medullary canals of the root to the central vascular system. Either already through this or through later invading secondary pathogens such as bacteria or fungi, the root is so severely damaged that it dies within one to two years from the point of infestation. The result is a considerable reduction of the root mass and consequently a reduced nutrient and water uptake. In the early stages, this leads to stunted growth and later to the death of the vine. Even a few grape aphids can cause dramatic damage to vineyards due to the devastating consequences of this infestation.

Voices of our members

Roman Horvath MW

wein.plus is a handy, efficient guide to a quick overview of the colourful world of wines, winegrowers and grape varieties. In Wine lexicon, the most comprehensive of its kind in the world, you will find around 26,000 keywords on the subject of grape varieties, wineries, wine-growing regions and much more.

Roman Horvath MW
Domäne Wachau (Wachau)

The world's largest Lexicon of wine terms.

26,266 Keywords · 46,869 Synonyms · 5,322 Translations · 31,599 Pronunciations · 193,636 Cross-references
made with by our author Norbert F. J. Tischelmayer. About the Lexicon