Possible Duplicate:
Google doesn't seem to update the description or title of my homepage
Here is a screenshot:
The site description shown is very old, from way back in January of this year. Yet the image shown is current.
How can I ask Google to update my sites description?
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
The snippet text you are referring to can come from the following places:
Can come from many different places depending on the situation
<head>...<meta name="Description" content="Your Description" />...</head>Setting up a Webmaster tools account and Sitemap would do alot to fix this.
Also try to increase the frequency with which Google crawls your page using Webmaster Tools->Settings->Crawl Rate (but not so much that it overwhelms the bandwidth of your site)
You can also find out when the last time Google has crawled your site was by visiting the cached version of the page in the search results.
(Note however that you can't change the crawl rate of a subdirectory of your site, you can only change it from the root url of the site).
Setting a Canonical Domain for your site can reduce reduce redundant visits from the Google crawler.
Setting a preferred URL (a Canonical URL) for pages can reduce redundant visits to the same information that can be reached by various URLs.
Also, if your site has alot of non-standard parameters for changing what sort of content is displayed a page, it's possible that Google is running out of resources for crawling your site, so you should configure your URL parameters.
