Heidi the Horrible said:

Thanks Eggs for the reply.

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

When do I treat Bermuda ?

I wouldn't. If you don't feed the bermuda, and try not to water *too often*
in the summer months, when the bermuda is aggressively growing. Fertilize
only during cool months. It'll take time, but the bermuda will eventually
weaken.

The only fast way I know to get rid of it, in tall fescue, is totally kill
the lawn and start over.


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 ?

No, because if the Bermuda is "slowing" it won't absorb as much of the
herbicide as it could, making the chemical less effective. [1]


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 ?

Why bother? It'll be dead soon enough. Pre-treat in the spring, and don't
miss the window. =)


[1] Unless you're going to kill the entire lawn. Then water and fertilize
first, to get the Bermuda really going, and absorbing everything it can.
Then hit the lawn with a broad spectrum herbicide once, and then again
about a month later. Most likely, the Bermuda won't return. Unless you're
neighbor is the one with the Bermuda lawn that's wreaking havoc in your
neighborhood.


HTH
--
Eggs

-There is always one more imbecile than you counted on.