You need to buy something specifically for nut sedge. Manage is one brand.
With Manage, you need a surfactant also.
I have to buy Manage from a gardening store. It's not at Walmart, Target,
etc.
Lots of great info here
http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7432.html
MANAGEMENT
Tubers are key to perennial nutsedges' survival. If you can limit production
of the tubers, then the nutsedge will eventually be controlled. To limit
tuber production, remove small nutsedge plants before they have five to six
leaves; in summer this is about every 2 to 3 weeks. Up to this stage, new
tubers have not yet formed. By removing as much of the plant as possible,
the tuber will be forced to produce a new plant, drawing its energy reserves
from tuber production to the production of new leaves. Continually removing
shoots eventually depletes the energy reserves in the tuber because 60% of
the reserves is used to develop the first plant and 20% for the second.
However, mature tubers can resprout as many as 10 to 12 times. Even though
these newer sprouts start out weaker than the previous ones, they will
gradually resupply the tubers' energy reserves unless they are removed.

The best way to remove small plants is to pull them up by hand or to
hand-hoe. If you hoe, be sure to dig deeply (at least 8-14 inches) to remove
the whole plant. Using a tiller to destroy mature plants will only spread
the infestation because it moves the tubers around in the soil. However,
repeated tillings of small areas before the plants have six leaves will
reduce populations. Many people mistakenly use systemic herbicides such as
glyphosate to try to kill the tubers after the plant is fully grown.
Unfortunately, when tubers are mature there is little translocation of the
herbicide from the leaves to the tubers, thus tubers are not affected.

If nutsedge is found in small patches in turf, it may be best to dig out the
patch at least 8 inches deep, refill, and then seed or sod the patch.

Biological control of nutsedge using insects and plant pathogens has been
researched, but as of yet has not provided consistent control.

In addition to consistently removing small plants, nutsedge populations can
be reduced by shading, drying, mulching with geotextiles, and with properly
timed applications of herbicides.


"Toby" wrote in message
link.net...
I have round uped it, Co Oped it, using 2 things the man sez it will take
it right out. Bull Snot it got it 50% of the grass/stems but no full kill.
How about spraying it with Diesel? Fill me it and I will dance at your
next weeding or divorce which ever comes first.
Dave
Tenn