Roger,
I know what that USGA guy means, but man do I bristle at those cute, simplistic explanations. They don't really address the issue of shade on a golf course, do they? And the reason a sod farm doesn't have trees is a lot more encompassing than shade.
But anyway, I understand, but dislike that type of delivery of the message. Another one I despise is "they call them greens for a reason".
Ugh. We need to address things a bit more intelligently than that.
Joe