16 



MAC (Michigan State Apple Clone) Series 



1. The origins of this series, listed below, were seeds from open pollinated 

 plants of the Mailing series 1 through 15, Alnarp 2, and Robusta 5. 



Name Mother parent Tree size 



MAC~9"(Mark) M9 Dwarf 



MAC 25 Alnarp 2 Semi-dwarf 



MAC 39 Mil Dwarf 



MAC 46 ' M9 Dwarf 



MAC 1 MS Semi -dwarf 



MAC 24 Robusta 5 Semi -dwarf 



Mark and MAC 24 currently are being tested at our Horticultural 

 Research Center, Belchertown, MA. Mark at present appears to be well 

 anchored and precocious, and produces a tree similar in size to M26. MAC 24 

 is producing a tree larger than on 7 and suckers badly. 



Pol ish (P) Series 



The descriptions of these rootstocks are incomplete and are based on 

 reports from other fruit growing areas. All are tolerant of low mid-winter 

 temperatures and resistant to collar rot. They are susceptible to fire 

 blight and woolly aphids. Ranked in order of dwarfing, small to large, they 

 are as follows: P-1, 16, 22, 2, 13, 14 and 18. P-1, P-2 and P-22 appear 

 most promising. It is reported that P-2 produces trees similar in size to 

 those on M9. P-22 is more dwarfing than M9. Trees on P-1 are reported to 

 be similar to those on M26 in size. 



Currently being tested at our Horticultural Research Center in 

 Belchertown are P-2 and P-22 as stempieces on KA/313* with Starkrimson the 

 variety. Four-year-old Starkrimson trees on P2/KA313 Are about twice as 

 large as those on P22/KA313. Those on M27 and P22/KA313 are similar in 

 size. It is obvious that root suckering is going to be troublesome when 

 KA313 is the understock on interstem trees. 



Cooperative Regional Plantings in 1984 in many fruit growing areas in 

 the United States and Canada, including Massachusetts, include Starkspur 

 Supreme Delicious on P-1, P-2, P-16, P-18 and P-22. 



Budogovsky (Bud) Series 



These were introduced for their mid-winter hardiness. Bud 9 is 

 reported to be very resistant to collar rot and Bud 490 has some resistance. 

 All are very susceptible to woolly aphids and susceptible to fire blight. 

 Bud 9 apparently is relatively free of burrknots. Bud 9 is a dwarfing 

 rootstock producing trees similar in size to those on M9. 



Researchers in the Netherlands reported in 1981 that trees on Bud 9 

 were more vigorous than those on M9, and less productive. Bud 9, Bud 490 

 and Bud 491 were planted in Regional Cooperative Plantings in 1984. 



*Trees received from Stark Bros. Nurseries. Clonal Antonovka rootstock 

 selected for its resistance to phytophthora. 



