May be m111 rootstock, which notoriously likes to create roots from these burr knots.
Related thread
https://growingfruit.org/t/burr-knots-on-m111/
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May be m111 rootstock, which notoriously likes to create roots from these burr knots.
Related thread
https://growingfruit.org/t/burr-knots-on-m111/