You can’t disable RSS – either globally or per post. The best you can do is deny access to the feed files. if you would like to prevent the entire post appearing in RSS feed, set the feed to Summary in Settings->Discussion.
How can I deny access to the feed files. My site http://www.similima.com
Try adding:
// Disable feeds
function my_disable_feed() {
wp_die( __('No feed available,please visit our <a href="'. get_bloginfo('url') .'">homepage</a>!') );
}
add_action('do_feed', 'my_disable_feed', 1);
add_action('do_feed_rdf', 'my_disable_feed', 1);
add_action('do_feed_rss', 'my_disable_feed', 1);
add_action('do_feed_rss2', 'my_disable_feed', 1);
add_action('do_feed_atom', 'my_disable_feed', 1);
to your theme’s function.php file.
