The Walla Walla Valley Alliance is reporting that the dreaded root louse, phylloxera is showing up in Walla Walla vineyards. Reports say the louse, which devastated vineyards in Bordeaux and later in California, has been present in the state since 1910 but no one has seen it in Walla Walla until now.
Earlier reports show that it also is in the Willamette Valley.
The colder climate in the Pacific Northwest is too cold for the root louse, but global warming has made temperatures more hospitable. That explains much of the spread.
None of this news means the end is near for either wine region. The spread of the root louse is easier to contain today that it was in the last century. Quarantine is usually the best solution, but no grape grower wants to admit their infection. Phylloxera takes 10-15 years to ruin a vineyard as the louse slowly sucks nutrients from the roots.
What this does prove, however, is that there is risk associated with small Walla Walla producers who develop their own root stock. Those developed by nurseries, for the most part, are phylloxera resistant and come with a lot more science invested in their creation.