Anything to worry about? Should I bury the rootstock or let it be? Evereste crab grafted on M26 rootstock. It’s been in the ground a year or so now.
Just leave it like that, M26 does this a lot, totally fine. If you bury it you will lose the M26 dwarving habit
Yes it looks like burr knots. It should be fine. In some regions borers enter the tree thru the burr knots but it seems this is a non-issue for most people.
Yes burr knots, but much less pronounced than say on M111 and it has been used successfully for years.