Apple Rootstock Info: Supporter 4

Characteristic Detail Description
Rootstock Supporter 4

Formerly selected as Pi 80 and resulted from a cross between M.9 and M.4. European reports indicate the vigor is similar to M.26 with good resistance to low temperatures, but susceptible to fire blight and it produced few root suckers. Supporter 4 is being tested in the 2002 NC-140 trial at nine locations with ‘Gala’ as the scion cultivar. After five years tree survival and tree size were similar to M.26 and it produced fewer burr knots and similar numbers of rootsuckers than M.26.  

Synonyms Supp 4
Origin M9 X M4
Availability Widely available
Tree Size 50-60% of standard
Precocity Early
Winter Hardiness Hardy
Suckering Very few
Tree Support Needed Yes
Where tested within NC-140 or other research plantings AR, BC, KY, MA, MI, NJ, NY, IL