Prodiamine 65 WDG (WG stands for Wettable Dispersible Granule) is an effective pre-emergent herbicide for pre-emergent grass and broadleaf weed control.  Prodiamine is flexible enough that it can be applied in both the spring and fall for season long crabgrass control.  Prodiamine 65 WG also control bluegrass, spurge, witchgrass and more, and can be used safely on St. Augustine, Bermudagrass, Fescue and other common turf grasses. Prodiamine 65 WDG can be mixed and applied along with fertilizer and iron solutions.