No because a robot has no referrer information to pass to the server, so it will be unaffected by that directive.

On Sunday, April 8, 2012 6:40:22 PM UTC-4, Webnauts wrote:

.

Now the question is, would referring the spammy sites to google.com help in any way? Like adding something like this in the .htaccess file? 

RewriteCond %{HTTP_REFERER} ^http://.*spamsite.*$ [NC]   

RewriteRule .* http://www.google.com [R]

I know it is a referral and not a permanent redirect, but it is just a thought.