Disable custom taxonomy on admin bar

Did you have a look in the Codex? The option your are searching for is ‘public‘

Just add it as an argument in your call to register_taxonomy() like this:

  $args = array(
    'public'        => false,
    ... [your-other-arguments] ...
  );

  register_taxonomy( 'genre', array( 'book' ), $args );

Docs go here:

public

(boolean) (optional) Should this taxonomy be exposed in the admin UI.

Default: true

http://codex.wordpress.org/Function_Reference/register_taxonomy

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