"Dustin Slater" wrote in message
...
My St. Augustine was going great guns this year, but just in the last
couple
of weeks I have gotten some large, irregular patches of pale grass. This
seems to be spreading. I put down some blood meal the other day thinking
it
might need some nitrogen.

What are the usual causes of this? Could it be grubs? I don't think I
have
under-watered. Suggestions?

It does sound like grubs. Check out this article:

http://tinyurl.com/3bggt