Weeds are indexed alphabetically. Select the section of interest.
Annual Blueeyed-grass (Sisyrinchium rosulatum)
Products containing atrazine or simazine applied twice 30 days apart. Prompt (a pre-mix of atrazine and Basagran) also works well. Sencor also provides excellent control in tolerant turfgrasses. Products containing two- or three-way broadleaf herbicide mixtures applied at least twice 7 days apart also work.
Annual Bluegrass (Poa annua L.)
Control options/strategies change constantly. Check with your local state turfgrass specialist for the latest recommendations. Preemergence control includes members of the dinitroaniline herbicide family and other preemergence products (e.g., benefin, bensulide, dithiopyr, fenarimol, napropamide, oryzalin, oxadiazon, pendimethalin, and prodiamine). Apply in late summer when air temperatures reach 75 F (24 C) for several consecutive days. Early postemergence control in warm-season turfgrasses, includes atrazine/simazine/ metribuzin, clethodim (Envoy), diquat (Reward), foramsulfuron (Revolver), trifloxysulfuron (Monument), sulfosulfuron (Certainty), ethofumesate (Prograss), bispyribac-sodium (Velocity), and pronamide (Kerb). Selective suppression is provided by plant growth regulators such as paclobutrazol (Trimmit), flurprimidol (Cutless), and mefluidide (Embark).
Bahiagrass (Paspalum notatum)
Manor or Blade (metsulfuron) in bermudagrass, St. Augustinegrass, centipedegrass and zoysiagrass. Of these grasses, bermudagrass and St. Augustinegrass tolerate Manor more. In bermudagrass, apply Manor twice, 3 to 4 weeks apart at 1 oz/acre. In centipedegrass, two applications of Sethoxydim G-Pro or Vantage 3 weeks apart suppress bahiagrass growth and seedhead development. In zoysiagrass or tall fescue, repeat applications of Fusilade II or Acclaim Extra may be used. Monument (trifloxysulfuron) will provide bahiagrass suppression.
Bermudagrass (Cynodon dactylon)
Preplant: Fumigate with methyl bromide (Dowfume, Brom-o-gas, Profume, Terr-o-gas), dazomet (Basamid); or metam-sodium (Vapam). If not fumigated, use 3 repeat Roundup Pro treatments every 3 weeks at 1 gal/a each. Postemergence control: In zoysiagrass or tall fescue, repeat Acclaim Extra (0.57 EC) at 28 oz/acre or Fusilade T&O (2EC) at 4 to 6 oz/acre on 30 day intervals. Add Turflon Ester at 1 qt/acre to increase control of Fusilade II. Use only on fescue >4 weeks old, start in spring, need good soil moisture, discontinue during summer stress. In centipedegrass, Vantage 1L or Sethoxydim G-Pro at 2 pts/a, repeat in 3 weeks. Envoy (clethodim) may be used in centipedegrass sod production. In St. Augustinegrass, Prograss 1.5EC at 2 gal/A + 2 qts/a of Aatrex 4L. Begin in mid-March, repeat in 30 days.
Bermudagrass Encroachment into Bentgrass Golf Greens
Siduron (Tupersan) and ethofumesate (Prograss) suppress bermudagrass; however, varying levels of bentgrass injury normally occur. Control is generally best in spring or fall when the bentgrass is actively growing and the bermudagrass is not. Temporary (up to three months) bermudagrass suppression has been achieved with combinations of siduron with flurprimidol (Cutless), as well as ethofumesate plus flurprimidol. This suppression has been superior to that achieved by the standard practice of using siduron alone. April treatments are less injurious to bentgrass and provide a level of bermudagrass suppression similar to a September followed by an April application. Tupersan 50WP is used at 16 to 24 oz/1000 sq.ft. in spring or fall. Water-in and repeat in 30 days. With Prograss 1.5EC + Cutless 50W, apply 1st application in March/April at 3 oz + 0.6 oz/1000 sq.ft. Repeat in 6 weeks at 1.7 + 0.14 oz/1000 sq.ft. Repeat again in 30 days. Temporary turf discoloration (~30%) will follow treatments.
Chamberbitter, Niruri or Gripeweed (Phyllanthus urinaria)
Products containing atrazine or simazine applied twice 30 days apart. Prompt (a pre-mix of atrazine and Basagran) also works well. Products containing two- or three-way broadleaf herbicide mixtures applied at least twice 7 days apart also work in tolerant turfgrasses. Begin treatments in spring when weeds are small.
Common Lespedeza, Annual Lespedeza or Japanese-clover (Kummerowia striata [Lespedeza striata])
Repeat applications of 2- or 3-way mixtures of 2,4-D, dicamba, MCPP, or MCPA. 2,4-D alone does not satisfactory control lespedeza. Other options include atrazine/simazine, metribuzin, triclopyr alone or combined with clopyralid or 2,4-D, atrazine plus bentazon, imazaquin, and metsulfuron. Spotlight, Confront, and Manor/Blade are effective.
Dallisgrass (Paspalum dilatatum)
Postemergence control in bermudagrass: repeat MSMA/DSMA applications at 1 to 2 lbs ai/a every 5 to 7 days starting in spring. Add Dismiss at 8 oz/acre to increase control. Must stay on schedule. Adding Sencore 75DF at 0.19 to 0.25 lb/a to MSMA or DSMA increases control but also increases turf injury. Tank mixing Revolver 0.19L at 26 oz/a with MSMA applied twice 3 weeks apart or using an alternating application pattern of MSMA fb Revolver fb MSMA 2 weeks apart also increases control without increasing turf injury. Water if turf is drought-stressed. In other grasses, spot treat or rope wick with Roundup Pro (4S) using 2 fl oz/gal water. Begin in spring, repeat in 2 to 3 weeks. Avoid desirable plants.
Dollarweed, Pennywort (Hydrocotyle spp.)
Repeat applications of two- or three-way mixtures of 2,4-D, dicamba, MCPP, or MCPA. Other suggested options include atrazine/simazine, metribuzin, triclopyr alone or combined with clopyralid or 2,4-D, atrazine plus bentazon, imazaquin, metsulfuron, and quinclorac. Best results with fall or spring treatments.
Doveweed (Murdannia nudiflora) and Spreading Dayflower (Commelina diffusa)
Products containing atrazine or simazine, foramsulfuron (Revovler) or metsulfuron (Manor or Blade) applied twice 30 days apart. Prompt (a pre-mix of atrazine and Basagran) also works well. Tank mixes of MSMA or DSMA with Sencor or multiple application of two- or three-way broadleaf herbicide mixtures also provide good control but also can cause phytotoxicity to certain turfgrass species. Tank mixing pyraflufen–ethyl (Octane), carfentrazone (Quicksilver), or sulfentrazone (Dismiss) with these products increase and hasten their activity. Repeat applications of all herbicides or combinations will be needed for complete control.