Girdle into the cambium and let it die a slow death. The top will rot and break off a little at a time. No more leaf out or mast this upcoming year.
Oh I know....ask someone on here that lives where there are no walnut trees , I’m sure you’ll get an expert 9 paragraph reply. I’m thinking of someone from Alaska
Tread lightly, buster!
If you take the time it takes, it takes less time. --Pat Parelli
American by birth; Alaskan by choice. --ironbender