Vineyard affected by Phylloxera disease

Vineyard affected by Phylloxera disease

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Caption: Vineyard affected by Phylloxera disease. Aerial view of vines (Vitis sp.) that have been attacked by Phylloxera (Daktulosphaira vitifoliae) insects. The diseased vines are seen as light patches in the vineyard. Phylloxera live on the roots of the grapevine and suck the sap from it, weakening and killing it. This pest is native to North America, where some grape varieties are naturally resistant to it, but produce lower quality wines. Phylloxera tends to attack the vines that produce the best flavoured wines. The solution is to graft nonresistant varieties to the roots of resistant ones, giving a relatively resistant plant with a higher quality grape flavour. Photographed in Napa Valley, California, USA.

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