He and his crew planted the Tree of Might on Earth so that the Earth's nutrients would provide the Tree with nutrients to create a special Fruit. When he consumed this fruit he proved too much for Goku and the Z warriors, even deflecting a genki-dama attack. Goku eventually draws his energy from the fruit and a second spirit bomb succeeds in defeating Turles and his tree.
Note: Turles is also a character I frequently use in Budokai Tenkaichi 2. He's also I character I really like the design of.