Apple Rootstock Info: B.9

Apples January 05, 2015 Print Friendly and PDF

 

Characteristic Detail Description
Rootstock B.9

Resulted from a cross of M.8 x ‘Red Standard’ (Krasnij Standard) from Russia. B.9 has been tested widely and is used commercially in the U.S. In general, B.9 is slightly more dwarfing than M.9 and has slightly higher yield efficiency than M.9. B.9 was selected as a dwarfing cold hardy rootstock and initial inoculation results indicated that it was as susceptible to fire blight as M.9. However, in field trials, trees grafted onto B.9 survived fire blight outbreaks better than trees on other dwarfing rootstocks. Recent reports from research conducted at the New York State Agricultural Experiments Station at Geneva, N.Y. indicate that B.9 becomes more resistant to fire blight as the tissue ages. There are two strains of B.9; the European strain has a more trailing growth habit whereas the North American strain has a more erect growth habit and these strains were compared in the 2002 NC-140 rootstock trial with ‘Gala’ as the scion cultivar. The American strain was slightly less dwarfing and produced more burr knots than the European strain and yield efficiency was similar.

Synonyms Budagovsky 9, Bud.9
Origin M.8 X 'Red Standard' (Krasniz Standard)
Availability Widely available
Tree Size 35-40% of standard
Precocity Very early
Winter Hardiness Hardy
Suckering Little
Tree Support Needed Yes
Where tested within NC-140 or other research plantings

AR, BC, CA, CO, IA, IL, KY, IN, MA, MI, MN, NC, NY, OH, OR, PA, UT, VA, WA, WI, GA, KS, ME, MO, NJ, TN, WV

 

'Gala' on B.9 (right) M.9 (left), 11th leaf.  'Braeburn' on B.9, 2nd leaf. 'Cameo' on B.9, 2nd leaf. 
Gala M9 lft B9 rght 11th lf Braeburn/B.9 rootstock 1-B.9
Photo by Robert Crassweller, Penn State.  Photo by Jon Clements, UMass. Photo by Jon Clements, UMass.

 

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This work is supported by the USDA National Institute of Food and Agriculture, New Technologies for Ag Extension project.