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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Isgrigg, J. III;
Yelverton, F. H. |
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| Author Affiliation: | Crop Science Department, North Carolina State University, Raleigh, NC 27695 |
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| Title: | Transition of poa annua ssp. reptans infested bentgrass putting greens to monoculture bentgrass using plant growth regulators and fungicides |
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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.: | 52nd Annual Meeting, Greensboro, NC, January 25-27, 1999 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 52, 1999, p. 76-77. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Poa annua; Agrostis stolonifera; Fungicide evaluation; Golf greens; Growth regulators; Fungicides; Paclobutrazol; Fenarimol; Tank mix; Propiconazole; Trinexapac-ethyl; Flurprimidol; Phytotoxicity; Quality; Chlorothalonil; Clippings
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| Facility Names: | Sandhills Research Station |
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| Abstract/Contents: | "A field trial was conducted at the Sandhills Research Station in Jackson Springs, North Carolina, over 1997-98 to evaluate the usefulness of plant growth regulators and fungicides in a program to control existing stands of a perennial biotype of annual bluegrass in creeping bentgrass (Agrostis palustris L.) putting greens. Treatments consisted of paclobutrazol a 0.3 kg ai ha alone or in combination with fenarimol at 0.6 kg ai as a tankmix, propiconazole at 1.5 kg ai tankmixed, cyproconazole at 1 kg ai tankmixed or as a 1 or 2 week sequential, or as a continuous 6 week treatment during PGR applications, paclobutrazol alone at 0.4 or 0.6 kg ai, trinexapac-ethyl at 0.1 or 0.2 kg ai ha alone, and flurprimidol at 0.3 kg ai ha alone. A nontreated check was included for comparison. Treatments were applied twice each in the spring and fall when bentgrass growth commenced. Treatments were arranged in a randomized complete block design with four replications. Data collected were visual rating of % annual bluegrass, phytotoxicity, and turf quality. Data were subjected to ANOVA, means were separated using the Fishers' Protected LSD procedure. Sod strips containing >90% perennial annual bluegrass were cut from a nearby golf course green and laid into the plots. Chlorothalonil was applied as disease preventative measure. Plots were mowed 3X weekly at 5 mm and clippings were removed. The site was irrigated as needed and core airification [aerification] was conducted spring and fall of both years with vertical mowing conducted in May of each year. All treatments containing paclobutrazol or flurprimidol reduced annual bluegrass most with >40% by the end of year 1 with the same treatments resulting in annual bluegrass stand reductions of at least 80% by the end of year 2. Annual bluegrass reductions for trinexapac-ethyl were at least 10% and 40% for years 1 an 2 respectively which was comparable to nontreated. Phytotoxicity was highest for paclobutrazol alone at the 0.6 kg rate or at the 0.3 kg rate tankmixed with either cyproconazole or propiconazole or combined with the continuous cyproconazole program. Treatments containing paclobutrazol at 0.3 or 0.4 kg alone or the 0.3 rate tankmixed with fenarimol, followed by a 2 week cyproconazole sequential, or with flurprimidol or tinexapac-ethyl had phytotoxicity levels similar to nontreated. Turf quality was reduced when paclobutrazol was tankmixed with either propiconazole or cyproconazole. The continuous cyproconazole treatment resulted in turf quality below minimally acceptable levels. Treatments with flurprimidol, and paclobutrazol alone, or trinexapac-ethyl at 0.1 kg were similar to nontreated while the treatment containing trinexapac-ethyl at 0.2 kg ai ha resulted in late season turf quality enhancement in year two. Treatments of paclobutrazol alone at 0.3 or 0.4 kg, paclobutrazol tankmixed with fenarimol, paclobutrazol followed by a 2 week sequential of cyproconazole, or flurprimidol at 0.3 kg ai ha resulted in the highest levels of annual bluegrass reduction with acceptable levels of phytotoxicity and no differences in turf quality compared to notreated. Trinexapac-ethyl treatments did not significantly reduce annual bluegrass populations but the 0.2 kg ai ha rate did result in enhanced late-season turf quality indicating it is a useful tool for management of mixed stand annual bluegrass/creeping bentgrass putting greens." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: P G Rs 1997-2006 |
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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):
Isgrigg, J. III, and F. H. Yelverton. 1999. Transition of poa annua ssp. reptans infested bentgrass putting greens to monoculture bentgrass using plant growth regulators and fungicides. South. Weed Sci. Soc. Proc. 52:p. 76-77. |
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MSU catalog number: SB 611 .S6 v.52 |
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