7. 



M27 is producing the smallest tree but has the highest produciton 

 efficiency of the various rootstock and interstem combinations. 



A planting of Starkspur Supreme Delicious (Pagnelli strain) 



on M9, EMLA-'-g, EMLA27, EMLA7 , EMLA26, MAC^9, MAC24 , OAR^I, and 

 Ottawa 3 was established in 1980 at the Horticultural Research 

 Station. In 1981, a planting of Starkrimson Delicious (Bisbee) 

 strain) on M27, C6/Antonovka , P2 Antonovka , and P22/Antonovka 

 will be established. 



The effects of the rootstocks and interstem/rootstock com- 

 binations on fruit maturation and quality in our plantings will 

 be evaluated in the future. 



********************* 



II . Effect of rootstocks and stempiece/rootstock combinations 

 on the tree performance and fruit quality of Mcintosh and 

 Delicious strains . F.W. Southwick 



In Spring, 1979, a randomized replicated Mcintosh rootstock 

 trial was planted at the Horticultural Research Center. Both 

 Rogers and Macspur strains are being tested on four rootstocks 

 planted in rows 20 feet apart: M7A, M26, M9 , and M9/MM111. On 

 M7A, Rogers and Macspur are planted 16 and 14 feet apart, respect- 

 ively, in the row. On M26 and M9/MM111 they are planted 14 and 12 

 feet apart, respectively and on M9 they are planted 10 and 8 

 feet apart, respectively. All combinations are being trained as 

 staked free-standing trees to a slender spindle system. In addi- 

 tion, both Rogers and Macspur on M9 are also being trained as 

 staked trees on a 4-wire trellis. Bisbee and Vance Delicious and 

 Cortland serve as pollenizers. 



All blossoms were removed in 1979 and 1980. Training began 

 in 1980, and cross-sectional areas of all trees were taken. In 

 1981 training and measurements will continue and fruiting may be 

 allowed to begin. 



1 



EMLA(East-Malling and Long Ashton) : virus-free 

 2 



Introduced by Michigan State University 

 3 



Selected by Oregon Agricultural Experiment Station 



