gistfile1.txt

add_action( 'pre_get_posts', 'test_per_dic' );
/**
 * Exclude Category from Blog
 * 
 * @author Bill Erickson
 * @link http://www.billerickson.net/customize-the-wordpress-query/
 * @param object $query data
 *
 */
 function test_per_dic( $query ) {
		if( $query->is_main_query() && $query->is_archive()) {
		$query->set( 'cat', '-64' );
	}
}