Yes. When you've used Delete URL/Path to remove a URL from our index, we recommend using robots.txt to exclude the content from being added to our indexed again. Robots.txt excludes Yahoo!'s crawler (Yahoo! Slurp) from re-indexing your content. A robots.txt exclusion rule reduces the number of pages Yahoo! Slurp will read from your server. It also helps you save bandwidth on your website.

Note: Site Explorer Delete URL/Path service facilitates the quick removal of your URL from our index and is helpful when a URL that you have excluded, continues to show up as a thin document, but it may not prevent our crawler from continuing to crawl the URL again. It is not an alternative to using robots.txt.