Say the word phylloxera to a winemaker and it’s akin to a death sentence for his wines.  Phylloxera (roughly pronounced  phil - ox - syrah) is a small louse that attacks the roots of the grape vine.  By the time the plant begins to show signs of disease above ground, it’s too late.   As it spreads very quickly from plant to plant, and from vineyard to vineyard, entire wine regions can be wiped out in a flash.
Nearly all vineyards in Europe  succumbed to phylloxera in the late 1800’s.  Can you imagine 70-90% of all the vineyards in Europe  destroyed by a microscopic bug?  What may be equally surprising is that the only cure for the horrible plague was to replant the European vines on American root stock---American vines were resistant to phylloxera.
Those of you who have been to Bordeaux 
Phylloxera first appeared in Bordeaux Napa  Valley 

 
 




