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| Publication Type:
| Report |
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| Author(s): | Lowe, D. B.;
Weinbrecht, J. S.;
McCarty, L. B. |
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| Author Affiliation: | University of Florida, Gainsville |
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| Title: | Purple nutsedge and perennial kyllinga control in turf |
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| Meeting Info.: | 48th Annual Meeting, Memphis, TN, January 16-18, 1995 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 48, January 1995, p. 96. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Eremochloa ophiuroides; Kyllinga; Stenotaphrum secundatum
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| Abstract/Contents: | "Research was conducted on a commercial sod farm located in Ft. McCoy, Fl, to control purple nutsedge (Cyperus rotundus) in centipedegrass (Eremochloa ophiuroides) and perennial kyllinga (Cyperus brevifolius) in St. Augustinegrass (Stenotaphrum secondatum). Chemicals applied were halosulfuron @ 0.063 lb ai/A; imazaquin @ 0.5 lb ai/A; chlorimuron @ 0.0156 lb ai/A; and, MSMA @ 2.0 lb ai/A. Tank mixes of imazaquin @ 0.5 lb ai/A + chlorimuron @ 0.0156lb ai/A; and imazaquin @ 0.5 lb ai/A + MSMA @ 2.0 lb ai/A also were applied. Each chemical was applied singularly and sequentially with the sequential application made 4 weeks after the initial (WAI). Treatments were initially applied on June 1, 1994 with a Ā² backpack sprayer calibrated at 20 gallons/acre. Plots were 5ft. X 10ft. in a randomized complete block. X-77 surfactant was added to each treatment at 0.25% v/v. Plots were rated at 6WAI, 8WAI and 10 WAI and included turfgrass phytotoxicity and total weed control. Turfgrass phytotoxicity was measured by a visual color estimation of 1-10, with 10=best color and 5=minimally acceptable. Weed control was determined visually as a percentage of 0-100%, with 100%=total control. Centipedegrass and St. Augustine reacted similarly to each treatment. Centipedegrass phytotoxicity levels were within the acceptable ranges (ā„5.0) for all the chemicals applied only once. Centipedegrass phytotoxicity levels were unacceptable (2.8) at 6WAI and 10WAI for sequential applications of MSMA and MSMA + imazaquin. St. Augustinegrass also had acceptable tolerance to all single chemical applications. Sequential applications of MSMA and MSMA + imazaquin produced phytotoxicity levels of 3.8 and 2.5 at 6WAI, respectively. At 10WAI, these levels increased to acceptable levels (7.3 and 6.8, respectively). St. Augustine reacted slightly different than centipedegrass to sequential applications of imazaquin and imazaquin + chlorimuron. At 6WAI, the phytotoxicity levels were 5.3 and 5.5 and increased to 8.5 and 9.0 at 10WAI, respectively. Sequential applications also increased weed control. Purple nutsedge control increased from single to sequential application 48% to 74% with chlorimuron; 71% to 94% with MSMA + imazaquin; 76% to 88% with halosulfuron; 80% to 86% with imazaquin; and, 86% to 91% with imazaquin + chlorimuron at 6WAI. Perennial kyllinga control increased from single to sequential application 50% to 86% with MSMA; 79% to 91% with MSMA + imazaquin; 61% to 71% with imazaquin; and, 76% to 79% with imazaquin + chlorimuron at 6WAI. The treatments that provided the best purple nutsedge control and acceptable centipedegrass phytotoxicity levels at 6WAI with a single application were imazaquin + chlorimuron (93%); imazaquin (91%); and, halosulfuron (81%). These treatments also provided the best control at 10WAI (48%, 59%, and 50%, respectively). Sequential applications of imazaquin, imazaquin + chlorimuron and halosulfuron also provided the best purple nutsedge control at 6WAI with 93%, 93%, and 88% control, respectively. At 10WAI, purple nutsedge control with imazaquin (93%) and imazaquin + clorimuron (88%) far exceeded control with halosulfuron (35%). The treatments that provided the best perennial kyllinga control and acceptable St. Augustinegrass phytotoxicity levels at 6WAI with a single application were halosulfuron (83%); chlorimuron (79%); MSMA + imazaquin (78%); and, imazaquin + chlorimuron (76%). At 10WAI, the percentages were 65%, 64%, 78% and 90%, respectively. Sequential applications of MSMA + imazaquin provided best perennial kyllinga control (91%) at 6WAI and imazaquin provided the least control (71%) at 6WAI. However, unacceptable St. Augustine phytotoxicity levels were obtained with sequential applications of MSMA, MSMA + imazaquin, imazaquin, and imazaquin + chlorimuron; therefore, only halosulfuron and chlorimuron provided acceptable phytotoxicity and good perennial kyllinga control (83%) and 75%, respectively) at 6WAI and at 10WAI (80% and 83%, respectively)." |
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| Language: | English |
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| References: | 0 |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Lowe, D. B., J. S. Weinbrecht, and L. B. McCarty. 1995. Purple nutsedge and perennial kyllinga control in turf. South. Weed Sci. Soc. Proc. 48:p. 96. |
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