season of a single cultivar in commercial settings. 



The 1984 NC-140 planting is at this time too young to 

 make any accurate statement about specific rootstocks. 

 However, data on tree size and yield are presented in Table 

 2, and this information can be used to get some idea of the 

 basic relationships among these rootstocks. After the 1988 

 growing season the smallest trees were on P. 16 and P.22, 

 and the largest were on P.18, CG-10, Ant.313, and 

 domestic seedling. On a cumulative basis the most 

 efficient trees were on P.2, P.16, Bud.9, C.6, and P.22. The 

 rootstocks with the most promise are Bud.9, P.2, and C.6. 

 All are between M.9 and M.26 in their size controlling 

 properties, and all trees on these rootstocks will need 

 support. Representative trees on these rootstocks are 

 pictured in Figures 4, 5, and 6. We will be observing this 

 planting for the next 5 years to see where some of these new 

 rootstocks might fit into our production systems. 



The next plantings of the NC-140 Rootstock Research 

 Committee are scheduled for 1990. One planting will look 

 at the interaction of rootstock and training system and the 

 second will study the interaction of rootstock and cultivar. 

 In the rootstock/cultivar planting we are trying to 

 eliminate the problem of evaluating a rootstock based 



14 



