Phylloxera as pests

Nature 
Phylloxera are aphid-like plant pests of the order Homoptera. The most notorious, because of its devastation of vineyards, is the vine phylloxera, or grape louse.
Incidence 
When phylloxera devastated the vineyards of France in the 19th century, they were saved by undamaged vines imported from California. Now phylloxera is present in vineyards around the world.
Value(s) 
Type 
(E) Emanations of other problems