benefin + oryzalin (XL 2G)
Rate 200 lb/a per application with at least 2 months between applications; do not exceed 600 lb/a per year.
Time Apply before target weeds germinate.
Remarks Precisely calibrate application equipment, preferably at half rates, to enable two perpendicular passes for increased accuracy. Inhibits cell division or mitosis, primarily in roots.
Caution Sensitive species include Douglas-fir, eastern hemlock, and begonia.
Site of action (both) Group 3: microtubule assembly inhibitor
Chemical family (both) Dinitroaniline
isoxaben + trifluralin (Snapshot 2.5TG)
Rate 200 lb/a
Time Apply to soil that is free from weeds and debris. Soil must be settled with water and free of cracks after transplanting.
Remarks Activate within 31 days using 0.5 inch of water or shallow cultivation before weeds begin to emerge. Follow label instructions for repeat treatments.
Caution Do not apply to unrooted liners or cuttings, bedding plants, or new-planted ground covers.
Site of action (isoxaben) Group 21: inhibits cell wall synthesis Site B; (trifluralin) Group 3: microtubule assembly inhibitor
Chemical family (isoxaben) benzamide; (trifluralin) dinitroaniline
oxadiazon + prodiamine (RegalStar G)
Rate 200 lb/a
Time Any time during the year, but before weed seeds germinate.
Remarks Cultivating or disturbing the soil after application diminishes weed control. Controls spotted spurge, knotweed, yellow woodsorrel, and clover.
Caution Do not apply herbicide granules to wet foliage. Cultivars of Ilex spp. (holly) and Rhododendron spp. may be sensitive to this product.
Site of action (oxadiazon) Group 14: protoporphyrinogen oxidase inhibitor; (prodiamine) Group 3: microtubule assembly inhibitor
Chemical family (oxadiazon) Oxadiazole; (prodiamine) Dinitroaniline
oxyfluorfen + oryzalin (Rout)
Rate 50 to 100 lb/a (2% + 1% formulation, respectively)
Time Apply uniformly, either in spring before weed seed germination and crop growth flush, or to weed-free soil.
Remarks Requires 0.5 inch water immediately after application to activate and to wash product from leaves. Acts as contact-type herbicide and inhibits cell division or mitosis in roots and shoots, respectively.
Caution Do not apply to wet foliage or plants with whorls. Note all other precautions on label.
Site of action (oxyfluorfen) Group 14: protoporphyrinogen oxidase inhibitor; (oryzalin) Group 3: microtubule assembly inhibitor
Chemical family (oxyfluorfen) Diphenylether; (oryzalin) Dinitroaniline