two seasons in the nursery. In April of 1991, 

 seven replications of all combinations were 

 planted at the University of Massachusetts 

 Horticultural Research Center. Yield and tree 

 size were assessed each year. 



Results & Discussion 



Overall tree size at the end of the seventh 

 growing season followed expected patterns, 



with trees on M.7 EMLA the largest, and those 

 on M.27 EMLA the smallest (Table 1). Further, 

 Pioneer Mac and Marshall trees were 

 significantly larger than Chic-A-Dee trees, and 

 Rogers trees were intermediate. Interestingly, 

 the relative differences among the four 

 rootstocks were not similar across the 

 cultivars. With Marshall Mcintosh, trees on 

 M.7 EMLA were smaller than expected and 

 similar to those on M.26 EMLA (Figure 1). 



Fruit Notes, Volume 62 (Number 4), Fall, 1997 



15 



