chop it off and make a bonfire
chop them up for firewood, mulch them
You can hammer in many rusty nails into the tree but the easiest way is to cut it down
A chainsaw.
the rare Berrybom tree kills it parents, because when it falls as a seed it falls near the tree (most of the time,sometimes the wind blows the seeds) and since the new tree has bigger and younger...
humans, vines, fire, bugs