Treatment Plan

Cornell University conducted several studies in New York State in the late 1970s and 1980s that confirmed that foliar injury to grapevines was caused by injury from ozone, a component of air pollution from industrial and automotive sources.  Oxidant stipple is less of a concern today than it was decades ago in the northeastern United States, associated with improvement in air quality including reduction of ozone levels.  Oxidant stipple injury can be reduced by maintaining high nitrogen level in vines of susceptible varieties under conditions of high ozone levels by applying several small doses of nitrogen fertilizer during the growing season using ground or foliar applications.