Per a previous request. One of these websites might hold info re fruits of
apple
rootstocks.
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Really nice fact sheets (Australia):
"All rootstocks described here are different varieties of apple (Malus
domestica Borkh.), and can be recognised by their variety characteristics.
Some
newer rootstocks bred for disease and pest resistance have used other species
of
Malus, but they are not yet commercially available in Australia. This Agfact
describes the major rootstocks in Australia and their uses, including some
new and
only recently available rootstocks. Information is available for each of the
following rootstocks (includes photographs of the branch and leaf):"