Here is wordpress function php Snippet code to disable plugin updates on WordPress blog.
remove_action( 'load-update-core.php', 'wp_update_plugins' ); add_filter( 'pre_site_transient_update_plugins', create_function( '$a', "return null;" ) );
Simply add that to your functions.php file and click save and the notices of wordpress plugin updates will disappear.
Thanks to WP Snippets for the useful tip!