I'm never good on timing. I usually ask someone before I do something I think is season-sensitive ...so I won't try to help you on that.
Check out this link that shows how to get a smooth transition from a trunk chop.http://bonsaijournal.com/beginners-trunk-chop-101.php
Thanks Larry & bwaynef.....
Larry I almost always cut at an angle just above a shoot or bud, which goes against most advice as generally a lot of people prefer the straight cut method, which I have done on a couple of trunks this season to compare methods. In the link which bwaynef supplied, (i'd come across it before.... but thanks all the same), it recommends the straight cut method also, but makes no mention of recessing the cut. I've always been concerned about water sitting on top of the flat cut, hence my reason for an angle cut..... I don't have much trouble healing these large wounds, as there is almost always a new leader getting all the energy as I remove most if not all side branches. Anyway, we're drifting off my original point, which was more a timing change for chops, rather than method.
Would mid to late Summer be a problem...... ? The trees in question are all in the ground and very healthy. Growth has hardened off. Just thinking it may be better as there is not so much energy as early spring/summer. Or have I got it completely wrong.
From the article...
The best time for most trunk chops is in mid to late spring or early summer (depending on your geographic location); after the new leaves have formed and begun to harden off.