Note 72 — Chapter XXVII

Some years ago many of the most valuable vineyards were destroyed by an insect pest known as the phylloxera, introduced from California. The trouble was overcome by replanting with American vines, the roots of which were immune to the pest. On these roots were grafted the choice French vines, the leaves and twigs of which were immune. In this manner the vineyards were restored with vines that are proof against attack, and the wine output has reached its normal amount.