Field Evaluation of Winegrape Rootstocks

Rootstocks vary in their performance from site to site. A report on the past 10 years of rootstock trials is being prepared to show the trends and contrasts among the trials. In this report, long-term averages of rootstock productivity and growth will be presented; this will give the basic production information. Following that, rootstocks will be examined individually and compared across sites. This analysis will show whether rootstocks perform consistently across sites and production systems; where they do not, a closer examination of site and practice will be done. Finally, correlation coefficient tables will be presented to search for the inter-relatedness of various components. It is hoped that this in-depth examination will give growers more insight to choosing rootstocks for their conditions.