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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Bunnell, B. T.;
McCarty, L. B.;
Higingbottom, J. K. |
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| Author Affiliation: | Department of Horticulture, Clemson University, Clemson, South Carolina |
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| Title: | Poa annua control options in overseeded turf |
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| Section: | Weed management in turf, pasture, and rangeland
Other records with the "Weed management in turf, pasture, and rangeland" Section
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| Meeting Info.: | 55th Annual Meeting, Atlanta, GA: January 28-30, 2002 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 55, 2002, p. 57-58. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 2 |
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| Abstract/Contents: | "Poa annua control in overseeded turf poses a long-term challenge to turfgrass managers. The growth habit and noxious seedhead production of Poa annua reduces the quality and aethestic value of overseeded golf course fairways and greens during winter and spring months. The objective of this research was to provide selective control of Poa annua while allowing the establishment of overseeded perennial ryegrass (Lolium perenne) fairways following a variety of pesticide applications at various rates and timings. Two Poa annua control studies were performed during fall and spring of 2000 and 2001 on perennial ryegrass overseeded 'Tifway' bermudagrass (Cynodon dactylon x transvaalensis). Each study was performed on a golf course fairway and research plots in Clemson, SC. The first study observed treatment combinations of Barricade 65 WG (prodiamine) at 0.38, 0.5, and 0.75 lbs ai/A and dual postemergence applications of Primo 1 EC (trinexapac-ethyl) at 0.12 lbs ai/A in October, 2 weeks apart. Barricade applications were made at 8 or 10 weeks before overseeding (WBO) or 4 weeks after overseeding (WAO). The second study evaluated Dimension 0.25 G, 40 WP, and 1EC (dithiopyr) at 0.5 lbs ai/A at various timings and Kerb 50 WP (pronamide) at 1.5 lbs ai/A at 6 WBO, Rubigan 1 AS (fenarimol) at 2.0 followed by (fb) 2.0 fb 0.68 lbs ai/A at 45 days before overseeding (DBO), 30 days after overseeding (DAO), and a December application, respectively. Other treatments included Ronstar 2 G (oxidiazon) at 2.0 lbs ai/A at 45 DBO, and Barricade 65 WG at 0.5 lbs ai/A at 45 DBO. Visual ratings were taken monthly. Poa annua control and overseeded grass cover and injury was rated on a 0-100% scale with 0%=worst and 100%=best. Minimum acceptable overseeded grass cover was 70%. In the Barricade/Primo study, no differences occurred in perennial ryegrass cover as all treatments allowed >70% cover in February and March at both locations. On the golf course fairway, best Poa annua control (>90%) followed all applications of Barricade and Barricade/Primo applications at both ratings in February and March. On the research plots, ā„70% control followed all treatment combinations except Barricade at 0.38 lbs ai/A (8 WBO), an application of Barricade 0.5 lb ai/A (10 WBO) fb the dual application of Primo, and a sequential application of Barricade at 0.38 (8 WBO) fb 0.5 lb ai/A (8WAO) at the February rating date. By March, >80% controlled followed sequential applications of Barricade at 0.38 lbs ai/A (8 WBO fb 4 WAO) and an application of Barricade at 0.75 lbs ai/A (10 WBO) fb the dual application of Primo. In the Dimension study, differences occurred between the two locations. On the research plots, >70% perennial ryegrass cover followed all treatments applications at all rating dates. The golf course fairway showed <70% perennial ryegrass cover with Kerb, Ronstar, and Barricade. Poa annua control was not consistent between locations. On the research plots, >70% Poa annua control followed Ronstar at 2.0 lbs ai/A (45 DBO). All other treatments failed to provide >70% control through March. The low control on the research plots may be attributed to the artificial seeding of Poa annua because of soil fumigation 3 years prior. On the golf coure fairway, good (>80%) Poa annua control followed all treatments except those including the 40 WP formulation of Dimension at 0.5 lbs ai/A. In summary, good long-term Poa annua control followed most applications of Barricade. In the Dimension study, only Ronstar gave acceptable control in both trial locations, however it did not provide acceptable ryegrass cover at all rating dates. Research will continue on long-term Poa annua control with varying pesticide combinations, timings, and rates. Sulfonylurea herbicides and DMI fungicides may potentially open new avenues of Poa annua control in overseeded turf. Additionally, improvements in establishment of overseeded turf species are necessary by adjusting seeding rates and dates." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bunnell, B. T., L. B. McCarty, and J. K. Higingbottom. 2002. Poa annua control options in overseeded turf. South. Weed Sci. Soc. Proc. 55:p. 57-58. |
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MSU catalog number: SB 611 .S6 v.54 |
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