Selecting Stone Fruit Crops and Varieties - Growing Organic Orchard Fruits - page 280

Myrobalan plum (cherry plum, Prunus cerasifera ) seedlings produce large,
vigorous trees and are cold-hardy, long-lived, and well adapted to most soils,
including wet winter soils. They are somewhat susceptible to root rot organ-
isms.
Myrobalan 29C rootstock produces trees that are somewhat less vigorous
than those on myrobalan seedlings. This rootstock is immune to root knot
nematode but susceptible to root lesion nematode, oak root fungus, and root
rot. Trees on Myrobalan 29C can be poorly anchored and blow over in windy
areas.
Marianna 2624 rootstock is considered by some fruit specialists to be the
best overall choice for plum rootstocks. It is resistant to oak root fungus, root
rots, root knot nematodes, and crown gall, but it is susceptible to bacteri-
al canker and root lesion nematode. This rootstock produces a small, rather
shallow-rooted tree and is, perhaps, the best plum rootstock for heavy soils
and rather poorly drained soils. It tends to produce suckers.
St. Julien is a Damson plum variety ( Prunus insititia ) whose seedlings are
used for rootstocks. These rootstocks tend to be hardy and relatively disease
resistant, while providing some dwarfing.
Peachseedlings are compatible with most plum and prune varieties and pro-
duce moderately large trees that bear early and set consistent crops. 'Lov-
ell' peach seedlings are often used as rootstocks for peaches and plums.
Peach rootstocks are somewhat resistant to bacterial canker but cannot tol-
erate heavy or otherwise poorly drained soils. They are generally suscept-
ible to oak root fungus and only recommended for well-drained soils. Some
selections are resistant to nematodes. Plums are not used as rootstocks for
peaches.
Citation is a peach-plum hybrid rootstock that produces full-sized trees and
is quite tolerant of heavy or otherwise poorly drained soils.