I had already seen injury caused by blanket
spraying of image, but had thought spot
treatment would be OK. I was going to
use Sedgehammer/Manage for nutsedge,
because it injures the turf less, but
kept the image around for crabgrass control.

I can't use the common crabgrass controls
(arsenic-based) on St. Augustine, so I guess
I need to keep looking. Maybe atrazine?

[Update: I pulled the seedheads from the
trash to confirm the ID and the weed may
be dallisgrass, which is NOT listed on
the image label. However, the damage
to my St. Augustine is real.]

Image really needs to get to the roots of the weed. And when properly applied it needs to be wet-down. It will not kill Nutsedge as, say Round-Up, where the product translocates from the plant to the root - it must get through the soil to the root. Unfortunately, many turf species cannot tolerate the product on the plant and it withers. So, I take my pump-up sprayer, put it right at the intersection of the weed and the soil and shoot the solution right into the ground. Thereafter I flush the spot with a cup or two of water to get it to the roots. No Image on the turf blades, flushed directly to the root of the plant -- problem solved.

So bacically you take them out one weed at a time - can't just spray the whole area. But it saves the truf and kills the weed.