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There are wordpress plugins you can use to modify your robots.txt, wordpress makes it difficult. http://yoast.com/example-robots-txt-wordpress/ Also, make sure it is an important page for your blog- Google is just being proactive on your behalf, it might be an irrelevant page to your overall plan.

a little off topic * Making one great site is my mode of operation and I have published lots of articles contributed by others.  In years past the other authors simply gave me articles because they wanted to share information about "a subject of their personal expertise" with the many people who visit my website. These articles usually have an author photo and a couple sentences about them at the bottom of the article and a link to their website or their email address. Google's penguin efforts seem to have produced an explosion of people who are offering content for the purpose of getting a link.  Most of this content is crap.  Some of it is "average" quality (which I don't publish) but some excellent material can be offered.  So now I am deciding if I want to accept some of this content, knowing that it is excellent content but also aware that I could be publishing links going to sites that could have past, present or future manipulation - and I don't want to get into link profile analysis on top of the content evaluation work. I have not seen any articles about the publisher site of post-penguin linking.