Annual, cylindric, and globe sedges were controlled > 90% with a single application of MSMA at 2.2 kg ai/ha in field studies. But this same treatment controlled fragrant and green kyllingas only 69 and 52%, respectively. Control was increased to 82 and 81%, respectively, with a repeat application. Other postemergence-applied (POST) herbicides evaluated included bentazon, halosulfuron, imazapic, imazaquin, and CGA-362622. Postemergence-applied herbicides were applied either once or twice, as well as alone and in combination with MSMA. In general, a sequential application of MSMA, either alone or in combination with any of the aforementioned herbicides, except bentazon, provided maximum control of the sedge and kyllinga species evaluated. Preemergence-applied (PRE) oxadiazon and S-metolachlor, controlled annual sedge ≥ 94% at 7 wk after treatment (WAT) in field studies and 96 and 70% at 9 WAT, respectively. Dithiopyr and prodiamine provided 86 to 80% control of annual sedge over the 9-wk rating period. In a hydroponic-type laboratory study, oxadiazon and S-metolachlor were more effective than atrazine, bensulide, imazaquin, oryzalin, or simazine, in reducing seedling development of annual, cylindric, and globe sedges, and green kyllinga.
Nomenclature: Atrazine; bensulide; bentazon; CGA-362622 (proposed common name trifloxysulfuron), N-([(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl)-3-(2,2,2-trifluoroethoxy)-pyridin-2-sulfonamide sodium salt; dithiopyr; halosulfuron; imazapic; imazaquin; S-metolachlor; MSMA; oryzalin; oxadiazon; prodiamine; simazine; annual sedge, Cyperus compressus L. #3 CYPCP; cylindric sedge, Cyperus retrorsus Chapm. # CYPRT; fragrant kyllinga, Kyllinga odorata Vahl. [Cyperus sesquiflorus (Torr.) Mattf. and Kuekenth.](no code); globe sedge, Cyperus globulosus Aubl. # CYPGL; green kyllinga, Kyllinga brevifolia Rottb. # KYLBR.
Additional index words: CYPCP, CYPGL, CYPRT, KYLBR, turfgrass weed control.
Abbreviations: POST, postemergence; PRE, preemergence; WAIT, weeks after initial treatment; WAT, weeks after treatment.
