You can hammer in many rusty nails into the tree but the easiest way is to cut it down
chop them up for firewood, mulch them
chop it off and make a bonfire
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
Patapon 3: Kill the Tree
Homefront Multiplayer Kills
Getting Rid of Tent Worms
Decrease of Pollinating Bees