The serious problem created by the importation to Europe of North America grapevines in 1860 was caused by

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The serious problem created by the importation to Europe of North America grapevines in 1860 was caused by Phylloxera, an insect that attacks and kills the root systems of grapevines. This led to a significant decline in grape production and wine quality in Europe until European grapevines were grafted onto North American rootstock, which proved to be resistant to Phylloxera.

The Serious Problem Created by the Importation to Europe of North