Steveo wrote:
HWick wrote:

why not use MSMA? You may need to treat two or more times but it works
well. it also kills other bad stuff. ??


Heh, the first frost will kill 100% of it.

Right. The idea is to kill the crabgrass, and only the crabgrass,
before it produces seeds. If you attempt to do this by mowing, be sure
you use a catcher to pick up all the clippings and seeds. FWIW, I
just use Bonide "crabgrass killer". It took three applications this
year but I don't think I'll have to use preemergent crabgrass killer
next spring.

Roundup it almost always the wrong thing to use for crabgrass. It kills
absolutely everything green and will leave gaping spots in your lawn.