On the Many Frustrations of Gardening: Pierce’s Disease
...Southern California an especially bad place to try to grow grapes. Why nurseries continue to sell vines suseptable to Pierce’s here is a mystery to me. In the 1990s Pierce’s disease wiped out 40% of the vines in Temecula’s vineyards. Northern California’s vineyards have experienced what Turney described as an “edge effect”, with Pierce’s claiming the vines on the outside of vineyards. The only way to prevent the spread of the sharpshooter is freq...