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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Yelverton, F. H.;
Isgrigg, J. III;
Hinton, J. |
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| Author Affiliation: | Crop Science Department, North Carolina State University, Raleigh, North Carolina |
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| Title: | New approaches to management of annual bluegrass in bentgrass putting greens |
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| Section: | Weed management in turf, pastures and rangeland
Other records with the "Weed management in turf, pastures and rangeland" Section
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| Meeting Info.: | January 25-27, 1999: Greensboro, NC |
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| Source: | Southern Weed Science Society Proceedings. Vol. 52, 1999, p. 72. |
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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: Poa annua control; Agrostis; Golf greens; Weed control; Quality; Growth regulators; Paclobutrazol; Flurprimidol; Trinexapac-ethyl; Dithiopyr; Ethofumesate; Herbicides; Herbicide evaluation; Application rates; Application timing; Growth; Germination
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| Abstract/Contents: | "Perennial and annual biotypes of annual bluegrass (Poa annua ssp. reptans & annua) continues to be the most troublesome weed in bentgrass putting greens in the US. Management strategies to remove or reduce this weed in putting greens have been only marginally successful. This is due to poor control or unacceptable bentgrass turf quality. Plant growth regulators (PGRs) that cause a temporary inhibition of the gibberellin biosynthesis pathway have been shown to reduce the perennial biotypes of annual bluegrass if used repeatedly over time. Research on the effects of these PGRs on the annual biotypes has not been sufficiently studied. Research trials were initiated on several golf course putting greens in NC with high populations of the annual biotypes of annual bluegrass. PGRs utilized include paclobutrazol, flurprimidol, and trinexapac-ethyl. Also included were the herbicides dithiopyr and ethofumesate. Rates of paclobutrazol ranged from 0.28 to 0.56 kg ai/ha. Flurprimidol was tested at 0.28 kg ai/ha and trinexapac-ethyl was utilized at 0.05 to 0.1 kg ai/ha. PRG applications were initiated in mid-October and applied at 4 wk intervals until bentgrass growth slowed in the winter months. Treatments were re-initiated in late February to early March when bentgrass began actively growing and were repeated at 4 wk intervals and ceased in late April to early May. All totaled, PGR applications numbered 4 to 6 applications for fall + spring. Dithiopyr was applied in mid-October only at 0.56 kg ai/ha. Ethofumesate were applied at 0.56 kg ai/ha in mid-October and again 3 wk later. Paclobutrazol was the most effective treatment in reducing annual bluegrass. Control ranged from 50% with 0.28 kg ai/ha to > 85% with 0.56 kg ai/ha. Flurprimidol was less effective with control ranging from approximately 10% to 40%. Trinexapac-ethyl was not effective in reducing annual bluegrass at any of the sites. Acceptable turf quality was obtained with all PGR applications; however, the 0.56 kg ai/ha rate of paclobutrazol resulted in lower turf quality than other treatments. Dithopyr or ethofumesate were also ineffective in reducing annual bluegrass populations in these sutdies. Greenhouse studies were also conducted to determine the effects of paclobutrazol or fluprimido on germination and growth of annual bluegrass and bentgrass when applied 3, 2, and 1 wk prior to planting, at planting, and 1, 2, and 3 wk after planting of both species. As was observed in field studies, paclobutrazol was the most phytotoxic to annual bluegrass seedings. Paclobutrazol also inhibited bentgrass growth when applied 2 wk or less prior to seeding or less than 2 wk after seeding. This indicates that an application interval of at least 2 wk should be observed when overseeding of bentgrass into existing putting greens. This was not observed with trinexapac-ethyl." |
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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):
Yelverton, F. H., J. III Isgrigg, and J. Hinton. 1999. New approaches to management of annual bluegrass in bentgrass putting greens. South. Weed Sci. Soc. Proc. 52:p. 72. |
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MSU catalog number: SB611 .S6 v.52 |
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