I can try, but I skim so much stuff in the course of a search for information
about a problem that I may not have it bookmarked. (I see that I said
"53F" in a previous post. It could have been from some research on
verticillium in potatoes.)
This document says, "This biocontrol is effective at temperatures above
45F,":
http://kentcoopextension.blogspot.co...1_archive.html
(I must have come across the "5[something]F" figure somewhere, but
I just noticed it in passing while looking for something else.)