If you remember back in Saiyan saga, can't remember if this occurred during the original DB as well, we first experienced an enemy so powerful that one of their moves could literally blow up the planet. This move was Vegeta's Galick Gun.
We also see on numerous occasions that the Kamehameha wave was just as powerful as the Galick Gun, and often times very more powerful than many other finishing attacks.
It can also be argued that the Spirit Bomb is powerful enough to blow up a planet, however , due to it requiring the environment's life force and kai in order to be formed I figure that it would actually dissipate or not do all too much damage to the planet's surface.
And don't get me started on Freiza's Death Ball :P
Is there a point where we just forget just how literally Earth shattering these moves actually are, or do the warriors find a way to make their attacks powerful, but only to say mountains and forests, not the planet core"
Finally, what other moves would you classify as "World Destroying" even if they are not specifically stated in the shows?