Thanks Eggs for the reply.

However...my problems don't seem to be as easy as you imply.

When do I treat Bermuda ?

I would assume it has to be actively growing. That doesn't really happen
here until June and the plants are already mature...being many years old.
The stuff is very strong and actively growing when the fescue is usually
stressed. Should I spray in May ? What about Sept when the Fescue is
coming back strong and the Bermuda is slowing ?

Also, I have treated my crabgrass with pre-emerge before with success but
missed the window this spring. The stuff didn't really germinate in a
noticeable way until mid-July and by then it was so hot and dry that I
didn't dare spray. I waited 'til I got a cool stretch in mid Aug.

Can I try again when the weather cools with stronger or more frequent dose
or should I just give up until next year ?