- any of several plant lice of the genus Phylloxera, especially P. vitifoliae(grape phylloxera ), which attacks the leaves and roots of grapevines.
- any homopterous insect of the genus Phylloxera, such as P. vitifolia (or Viteus vitifolii) (vine phylloxera), typically feeding on plant juices, esp of vines: family Phylloxeridae
