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. The other four herbicides do not present any carryover concerns. With early preplant applications and in seed corn production, longer soil persistence may result in better weed control. If late season grasses in corn are a problem, longer persistence is important. However, with at-planting applications in commercial field corn or soybeans, herbicide failures due to inadequate herbicide persistence are rare with any of these herbicides.