The herbicides vary in their activity on broadleaved weeds and yellow nutsedge. For pigweed control, each of the herbicides except Prowl is rated good. Prowl is rated fair. For velvetleaf, Prowl will provide some control and is rated fair. The other herbicides have little activity on velvetleaf.
Prowl has no activity on yellow nutsedge.
Details of the effectiveness of these herbicides are available in the 1996 Weed Control Guide, MSU Extension Bulletin E-434. The herbicide requiring the most rainfall is Prowl. Two factors that affect mobility are water solubility and binding to soil particles. Prowl is very immobile in soil. Persistence in Soil Prowl is the most persistent herbicide of this group and can cause carryover problems to sugarbeets and, at high rates, no-till or reduced tillage corn.