- 2k - 



10. M.4 - One of the original Mailing series producing trees similar in 

 size, precocity, and suckering to trees on M.7. One of the major 

 problems of M.^ is that roots tend to develop mainly on one side, 

 making anchorage questionable. There is renewed interest in this stock 

 because of its resistance to collar rot. 



11. EMLA 7 - One of the semi-dwarfing standards in this trial. 



12. EMLA 26 - One of the dwarfing standards in the trial. 



13. B. 'tSO - Another of the Budgovsky series producing trees similar in 

 size to MM. 106. It induces early production, burr knots rarely occur, 

 and it is easy to propagate from hardwood cuttings. It is crown rot 

 resistant and moderately susceptible to fire blight and susceptible to 

 wooly aphid. 



1A. P. 2 - One of the hardy Polish series producing trees larger than M.9 

 and smaller than MM. 106 with productive efficiency good, but slightly 

 lower than that of M.9. It has good resistance to crown rot. 



15. P. 16 - One of the Polish series producing trees of M.9 size with similar 

 winter hardiness and productive efficiency but with superior propaga- 

 tion characteristics. 



16. P.l8 - One of the Polish series that resulted from a cross of M.4 x 

 Antonovka and produces a tree size similar to that of MM. 106. It shows 

 less susceptibility to fireblight than the other P series rootstocks, 

 combined with good resistance to crown rot. 



17. Own Rooted - These stocks were produced through tissue culture by 

 Oregon Rootstock and Stark Brothers Nursery so that we could test tree 

 performance and size of Starkspur Supreme Delicious without a geneti- 

 cally different rootstock. 



18. C.6 - Originated as a dwarfing interstem by Stark's from open polli- 

 nated M.S. It reportedly produces trees the size of M.26 and is very 

 susceptible to fire blight. 



19. Antonovka 313 - From the Adams Nursery in Washington State as selec- 

 tions from open-pollinated Antonovka from Poland, This selection 

 appears resistant to crown rot. 



20. 0.3 - Originated as a cross of Robin x M.9. (Robin is a hardy 

 crab-apple.) It produces trees of M.9 size or slightly larger, but 

 they are better anchored than M.9 trees. It is reported to be 

 resistant to crown rot, but susceptible to fire blight and to wooly 

 aphids. Suckering is rare. 



21. AL 800 - Produced from suckers of a dwarfed Duchess tree on seedling 

 rootstock in the Arnold Lynd orchard in Ohio. The original tree did 

 not show winter injury symptoms after the 1936 freeze or the collar rot 

 experienced by trees on MM.IO6 in surrounding blocks. This rootstock 

 has not been tested and demonstrates difficulty in propagation by con- 

 ventional methods. 



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