Ekka, couple of points; 1) the cut you show is almost perpendicular to the branch, thats not the cut I would have made.
2) The tree species I'm not sure? Would seem to be a relatively weak compartmentaliser, so perhaps I would have moved closer to the red line than the blue, but hey mate the difference between the two would be flat out being 20mm. If It is a relatively weak compartmentaliser (maybe not as bad as Delonix) then I don't think even if you hit the cut on the red line mark you'd prevent that cambium dieback, so you'd still have the insect feast countered by the vitality and energy reserves of the tree.
If I can see the stem bark ridge then yes I would make my best attempt to cut strictly according to Shigo's model, if I can't and maybe its my eyes but on many trees i work on i can't see it, then my cut will move fractionally up to the blue line. But its in no way a stub that I leave.
SF |