I just found this nifty code for disabling all pingbacks and trackbacks for old posts. You run this command as a MySQL query through phpMyAdmin…
UPDATE wp_posts SET ping_status=”closed”;
Note, if you uncheck the boxes for “Allow link notifications from other Weblogs (pingbacks and trackbacks.)” in the blog admin area, it only prevents pingbacks and trackbacks for future posts, not old ones.
Running the command, above, will stop pingbacks and trackbacks for old posts.
Detailed “How To”:
Access Cpanel for your webhosting account. Click phpMyAdmin. Select your blog’s database. Click the “SQL” tab at the top of the page. Enter the command and click “Go”.
Job done in 5 seconds. 