Gisela® 12(195-2 cv.) U.S.P.P. #9631  A precocious, semi-dwarf cherry rootstock,
yielding a tree about 60% of one grown on Mazzard. Produces a tree that is
stocky, spreading and open. Wide soil adaptability and does well on heavy soils.  
This stock is very precocious and productive. Resists suckering has good virus
resistant, is well anchored but may require support.

Gisela® 5 (148-2 cv.) U.S.P.P. #9622 A popular introduction in Germany, this
rootstock produces a very precocious tree approximately half the size of trees
grown on Mazzard rootstock. It produces an open, spreading tree with wide
angles. It is quite virus tolerant and does well in heavy soil. Trees grown on
Gisela® 5 may need to be supported. Some suckering may occur depending on
growing conditions. It is very hardy and produces well. It is compatible with most
varieties. It has shown good results in Washington State.

Krymsk 5  Is adapted to a wide range of soil types. Trees are well anchored and
winter hardy with low to moderate suckering. Krymsk 5 is sensitive to prune dwarf
virus and necrotic ring spot virus.  A semi-dwarf rootstock that produces a tree
slightly smaller than Mazzard, roughly 80 to 90 percent.

Gisela® 6 (148-1 cv.) U.S.P.P. #8954   A semi-dwarf rootstock that produces a
tree slightly smaller than Mazzard, roughly 80 to 90 percent. A good substitute for
Mazzard, Gisela® 6 is well suited for heavy soil types. Stimulates very early
blooming and heavy bearing and has a wide range of soil adaptability and
actually like heavy soils.  The tree structure is very open and round. Very
precocious despite its vigor. It appears tolerant to many cherry viruses (bacterial
canker) and is not prone to suckering. Anchors well, but may need support,
especially in the first fruiting years because of its precocious nature.

Krymsk 6  Tree size is 65% to 75% of Mazzard with low to moderate suckering.
Krymsk 6 is winter hardy and adapted to a wide range of soil types. Like Krymsk
5, it is sensitive to prune dwarf virus and necrotic ring spot virus.

Mazzard (P. avium)  This seedling rootstock produces a vigorous tree with very
good anchorage. It is best compatible with sweet cherries. It tends to resist
common cherry diseases better than Mahaleb. It has some tolerance to
Phytophthora and is moderately resistant to Oak Root Fungus. It grows best on
sandy loam soil, but is also tolerant of heavy soils. It is susceptible to Crown Gall
and Bacterial Canker . But it is resistant to water stress, and root knot
nematodes. Overall, Mazzard seedling makes a very large and hardy tree, with a
few root suckers.

Colt  Sensitive to drought soils and cold winter temperatures, Colt is a low
productive rootstock similar in size to Mazzard. It has shown resistance to
bacterial canker and phytophthora but is susceptible to crown gall. It is resistant
to cherry stem pitting and is more tolerant of heavy soils than Mahaleb.  It is
drought sensitive, slightly dwarfing and susceptible to crown gall.

Mahaleb  This seedling rootstock comes in more of a bush form than Mazzard. It
produces a standard size cherry tree. It is cold hardy, drought tolerant, and highly
productive. It's anchorage is excellent. It is susceptible to Oak Root Fungus, Root
Knot and especially Phytophthora. It is somewhat resistant to Crown Gall and
resistant to Bacterial Canker and Root Lesion. It grows best in light sandy loam
soils. It does poorly in heavy soils.

MXM® 60 Developed in Oregon, this clonal rootstock is a natural hybrid of
Mazzard and Mahaleb.  It shows a wide range of soil compatibility and is used as
a under stock for both sweet and sour cherries.  MxM®60 has moderate
resistance to phytophthora and crown gall and expresses some tolerance to
bacterial canker.  The root is more productive than mazzard and research shows
little to no suckering.  Hardiness is similar to Mahaleb and vigor is slightly greater
than Mazzard.
Stan Peterson Fruit Tree Sales
2574 S. Benedict Road
Ludington, MI  49431
Toll Free 1-888-333-1464
Fax 231-843-4113
Cherry Rootstock