In article ,
"symplastless" wrote:


I've no idea what a Japanese pine is but I have one Chinese black
Pine. Around here they mulch themselves as do the white pine.. However
I rob it and add the needles to my foot paths. If you are have a
general malaise with the whole tree involved I'm clues less. I've have
many white pine with some sort of borer that kills the new top growth
but the tree's seem to be able to carry on sometimes sending up a new
leader.

This usually happens to white pines grown out in the open. It is called the
"white pine weevil". You can train one young branch to be the new leader.
Maybe about what, 15 year old trees?

The trees are about 30 years old and grow amongst black oaks.

Thanks!

Bill

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Garden in shade zone 5 S Jersey USA