Apple Rootstock Info: M.9

Apples January 05, 2015 Print Friendly and PDF

 

Characteristic Detail Description
Rootstock M.9

The pedigree is unknown and it was selected in England from a group of French genotypes known collectively as “Juane de Metz” in the late 1800s. M.9 is the most widely planted dwarf apple rootstock in the world and at least 30% of the trees in the U.S. are on M.9. M.9 EMLA is free of known viruses and is slightly more vigorous than the original M.9. Over the years European nurseries have selected clones of M.9 and now a number of clones are available and they vary in vigor: Six clones were compared in the NC-140 1994 dwarf rootstock trial with ‘Gala’; vigor from highest to lowest is M.9 Pajam 2 (also known as Cepiland) = M.9 RN29 (also known as Nic29) > M.9 Pajam 1(also known as Lancep) > M.9 EMLA > M.9 NAKBT337 > M.9 Flueren 56. In a Washington state trial, M.9 NAKBT337, M.9 Janssen 337 and M.9 Burgmer 751all produced trees of similar size. M.9 NAKBT337 is currently the most widely planted of the M.9 clones. Although M.9 performs well under many conditions and is considered the standard for dwarf rootstocks, it is not without problems. It is very precocious and has high yield efficiency, but it has poor anchorage due to brittle roots and a high fruit: wood ratio and requires full tree support. M.9 is very susceptible to fire blight and woolly apple aphid and fairly resistant to crown and root rots. It produces moderate amounts of root suckers and many burrknots.

Synonyms Malling 9, Malling IX, EM IX, EMLA 9, NAKBT337, NIC29, Pajam 1 & 2, T340
Origin Selection from Juane de Metz
Availability Widely available
Tree Size 45-50% of standard
Precocity Very early
Winter Hardiness Hardy
Suckering Moderate
Tree Support Needed Yes
Where tested within NC-140 or other research plantings AK, BC, CA, GA, IA, KY, MA, ME, NY, PA, UT, VA, WI

 

6-M9 McIntosh M9 Gala M9 lft B9 rght 11th lf
'Cameo' on M.9. 2nd leaf. Photo by Jon Clements, UMass. 'McIntosh' on M.9. 10th leaf. Photo by Robert Crassweller, Penn State. 'Gala' on M.9. 11th leaf. Photo by Robert Crassweller, Penn State.

 

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