Photos courtesy of Bhaskar Bondada A shrivel is not just a shrivel. Of the various types of shrivel impacting grape quality, sour shrivel is especially unwanted because it renders the fruit unsuitable for winemaking. The disorder, found in vineyards around the world, is known by several names. In California, researchers have begun calling it SAD for sugar accumulating disorder to distinguish it from other shrivels; Washington State University’s Dr. Bhaskar Bondada coined the term “sour” to stand for suppression of uniform ripening. Sour also aptly describes the taste of berries exhibiting the disorder. Grapevine physiologist Bondada says it shows up […]