Dies to Removal

Will Pithing Needle prevent Bloodrush abilities from being activated?

Example: Opponent casts Pithing Needle naming Rubblebelt Maaka. Can I no longer use Maaka's bloodrush ability?

Bloodrush has the colon, that means its an activated ability. I'd say yes, pithing needle blocks it.

Bloodrush has the colon, that means its an activated ability. I'd say yes, pithing needle blocks it.

Correct, pithing needle does not specify what kind of source (e.g. a permanent) the activated ability should come from, so it can prevent the usage of activated abilities (aka bloodrush, as noted above) from cards in your hand, graveyard, the battlefield, the command zone, etc.

It does not, however, work against bestow. You can play a pithing needle naming boon satyr and it will do absolutely nothing, unless a third card gives it an activated ability (example dragon mantle).