North American Fruit Explorers mailing list at ibiblio

[Mark Lee <mark.lee.phd@gmail.com>]

I found an article about rooting cutting of fruit trees. Some cuttings of
plum and peach varieties will root over 50% of the time according to this
research. Most varieties have a pretty low success rate, like 10% or lower.
The special ones that are used for rootstock have close to 100% success, so
if you have unused rootstock from last year, or a graft failed but the
rootstock sent up a whip, cut off the top and try to root it. There is a
good chance you will succed, at least for prunus.
http://ressources.ciheam.org/om/pdf/a05/CI000574.pdf
-Mark Lee, Seattle