F9001 - A New Preemergence Herbicide for Weed Control in Turf.

F9001 (Sulfentrazone + Dithiopyr) is a new herbicide being developed for pre-emergence control of annual grasses, sedges and broadleaf weeds in turf. Optimum control of most species is obtained when F9001 is applied prior to weed germination.  Additionally, F9001 has also shown early post-emergent control of crabgrass (Digitaria spp.), goosegrass (Eleusine indica), and sedges (Cyperus spp.).   Turfgrass tolerance and weed control were evaluated in the Northeast, Midwest and Transition Zone of the United States during 2009 and 2010.  Warm and cool season turfgrasses show excellent tolerance to F9001.  Both sprayable and granular fertilizer formulations have been evaluated at rates of 0.375 lbs ai/a to 0.875lbs ai/a.  Primary weeds controlled include large and smooth crabgrass, goosegrass, sedges and kyllinga (Kyllinga spp.), as well as many broadleaf weeds.  F9001 provided excellent preemergence crabgrass control in studies at 120 days after treatments from all rates evaluated.  Excellent control of crabgrass and goosegrass observed from higher rates of F9001 when applied at the 1-2 tiller stage of growth for both grasses.  F9001 is expected to be registered by USEPA in late 2010.