"Greg" wrote in message
...
Never heard of it.

MSMA is primarily used on Bermuda grass lawns. When used correctly, it's
very effective against crabgrass. Johnson grass usually does not grow in
the middle of a lawn because it can't survive very well when regularly
mowed. You may have crabgrass rather than Johnson grass. If this is the
case, and you have a Bermuda lawn, MSMA works very well especially this time
of year. MSMA is also pretty cheap, but use it for spot treatment only.