(May 8, 2020) – Prunus Replant Disease (PRD) can occur after a mature almond orchard is pulled and new trees are planted in that same soil. Though relatively common in the Central Valley, the causes of PRD are less understood than growers may assume.
Greg Browne, a research plant pathologist for the USDA Agricultural Research Service and a member of the University of California (UC), Davis Department of Plant Pathology, describes PRD as “growth suppression, mediated in part by soil microbes, in successive plantings of almonds or other stone fruits.”