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How a devastating grape pest is reshaping vineyards across Colorado’s Western Slope

By Charlotte Oliver, Extension Associate Professor, Colorado State University

Grape phylloxera, or Daktulosphaira vitifoliae, is an aphidlike insect that attacks grapevines with devastating effects. In Colorado, where wine is an estimated US$3.9 billion dollar industry, phylloxera poses a significant threat.

In 2015, several vineyards in the Grand Valley American Viticultural Area on Colorado’s Western Slope observed that groups of their vines were not thriving. The…

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