Apple Rootstock Info: P.18

Apples January 05, 2015 Print Friendly and PDF


Characteristic Detail Description
Rootstock P.18

Resulted from a cross of M.4 x Common Antonovka and released by the Research Institute of Poland  in Skierniewice, Poland. This is a nondwarfing rootstock with vigor similar to seedling. It has not been tested widely in North America, but based on a trial in Illinois P.18 was less precocious and had lower yield efficiency than MM.111. Inoculation tests in California indicate it is moderately resistant to phytophthora. It is susceptible to wooly apple aphid, moderately susceptible to fire blight, produces few root suckers and burr knots, and does not need tree support. 

Synonyms Polish 18
Origin M.4 X Common Antonovka
Availability Widely available
Tree Size 100%
Precocity Late
Winter Hardiness Hardy
Suckering Very little
Tree Support Needed No
Where tested within NC-140 or other research plantings AR, BC, CA, CO, IA, IL, IN, MA, MI, MN, NC, NY, OH, OR, PA, UT, VA, WA, WI


P.18 Tree P.18 Blossom P.18 Flower Cluster
P.18 Tree P.18 Blossom P.18 Flower Cluster

Images used by permission. Originally published on


P.18 Fruit P.18 Tree with Fruit
P.18 Apple Measure P.18 Tree with Fruit

Images used by permission. Originally published on


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