Productive parameters in Chardonnay and Vermentino grapevines infected with "bois noir" and recovered in Sardinia

Studies were carried out in north Sardinia (Italy) in Chardonnay and Vermentino grapevines infected with "bois noir" to verify productive performance of the yields of plants healthy, infected and in recovery for one or two years. Statistical significant differences were observed in the yield among the symptomatic and the healthy plants, and among the healthy plants and those in recovery for one year, but not always between healthy plants and those in recovery for two years. Not statistically significant was the comparison between the two recovered groups. Productive increase was progressive in plants recovered for one year and in those in symptomatic remission for two years.