Compare Dithiopyr 40WSB Herbicide to Dimension Ultra 40 WP, ( both contain Dithiopyr 40.0%). Dithiopyr 40 WSB is more economical. Dithiopyr 40 WSB is an excellent herbicide for pre-emergent control of crabgrass. Other important grasses include kikuyugrass, goosegrass, chickweed, annual bluegrass, barnyard grass, oxalis, ryegrass, spurge. See the product label for all the listed annual grasses and broadleaf weeds. It may be used on established turf, field-grown nurseries, golf courses, landscape ornamentals and more listed locations.