Phylloxera is a tiny aphid-like insect, Daktulosphaira vitifoliae, that feeds on grapevine roots and leaves. The root-feeding form can damage European grapevines, Vitis vinifera, causing root lesions, declining vigour and eventually vine death. Phylloxera spread from North America to Europe in the nineteenth century and devastated many vineyards, especially in France.
Phylloxera was introduced to Europe during the nineteenth century, likely through the movement of North American grapevine material. European vines were highly susceptible to the root-feeding insect, and the infestation spread across major wine regions. The crisis transformed European viticulture and led to the widespread replanting of vineyards.
Many North American grape species and rootstocks have natural resistance or tolerance to phylloxera. The principal long-term solution was to graft European Vitis vinifera scions onto resistant American or hybrid rootstocks. The scion produces the desired grape variety, while the rootstock provides the root system and influences vigour, soil adaptation and other characteristics.
Some vineyards remain ungrafted in places where phylloxera cannot thrive easily, including certain sandy soils, isolated locations and regions with specific environmental conditions. Chile is often cited as a region with many ungrafted vineyards, although phylloxera status and vine planting practices vary by area.
Example: a French Cabernet Sauvignon vineyard is commonly planted as Vitis vinifera grafted onto a phylloxera-resistant rootstock.
Phylloxera is an insect pest that attacks grapevines. It should not be confused with fungal diseases such as powdery mildew or downy mildew, which require different management.
Chef’s note: phylloxera reshaped the modern wine industry. Rootstock choice remains an important decision in vineyard establishment.
This term is one of hundreds covered in depth across OCS courses, learning paths, and 1-on-1 coaching with Chef Eric.
