In sandy soils, those cracks don't occur just like you see when it gets wet and dry at your home. If you have a sandy area, the sand doesn't create those avenues. So the phloxure can't attack and kill in super sandy soils. So a lot of preserved grapevine genetics have been preserved. In France they have the beaches or they're near Montpelier. In Australia, they have some spots in the Barossa that are old river sands. (15:11–15:16)
CLAIM
Asserts that phylloxera cannot effectively attack grapevines in sandy soils.
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