Phylloxera

This is a map from 1886 showing the number of vines below the farm Nooitgedacht, Annandale, that were affected by pylloxera http://en.wikipedia.org/wiki/Phylloxera, a sap-sucking insect that feeds on the roots of grapevines. In the late 19th century, the phylloxera epidemic dramatically affected the wine industry, just about wiping out vineyards around the world.