Remove Widgets

// Remove genesis and core widgets
add_action( 'widgets_init', 'prefix_unregister_widgets', 20 );
function prefix_unregister_widgets() {

    // Core Widgets
    unregister_widget( 'WP_Widget_Calendar' );
    unregister_widget( 'WP_Widget_Meta' );
    unregister_widget( 'WP_Widget_Recent_Comments' );
    unregister_widget( 'WP_Widget_RSS' );
    unregister_widget( 'WP_Widget_Tag_Cloud' );
    unregister_widget( 'WP_Widget_Archives' );

    // Genesis Widgets
    unregister_widget( 'Genesis_eNews_Updates' );
    unregister_widget( 'Genesis_Featured_Page' );
    unregister_widget( 'Genesis_Featured_Post' );
    unregister_widget( 'Genesis_Latest_Tweets_Widget' );
    unregister_widget( 'Genesis_Menu_Pages_Widget' );
    unregister_widget( 'Genesis_User_Profile_Widget' );
    unregister_widget( 'Genesis_Widget_Menu_Categories' );

}