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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Cummings, H. D.;
Yelverton, F. H.;
Bowman, D. C.;
Rufty, T. W. Jr. |
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| Author Affiliation: | North Carolina State University, Raleigh, NC |
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| Title: | Lateral recovery of creeping bentgrass in response to plant growth regulators and preemergence herbicides |
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| Section: | Section II: Weed management in turf, pasture, and rangeland
Other records with the "Section II: Weed management in turf, pasture, and rangeland" Section
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| Meeting Info.: | 54th Annual Meeting, Biloxi, Mississippi: January 22-24, 2001 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 54, 2001, p. 59. |
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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: Root growth; Agrostis stolonifera; Preemergence herbicides; Dithiopyr; Bensulide; Oxadiazon; Eleusine indica; Crabgrass control; Growth regulators; Paclobutrazol; Cyproconazole; Poa annua control; Trinexapac-ethyl; Lateral growth; Plant recovery; Application rates; Application timing; Herbicide combinations
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| Cultivar Names: | Penncross |
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| Abstract/Contents: | "Maximum root growth of creeping bentgrass (Agrostis palustris Huds.) in North Carolina occurs in the spring and fall. The majority of creeping bentgrass roots die during the summer months in the transition zone. Preemergence (PRE) herbicides like dithiopyr and bensulide + oxadiazon may be applied in the spring to control goosegrass (Eleusine indica) and crabgrass (Digitaria sp.). Plant growth regulators (PGRs) like paclobutrazol and paclobutrazol + cyproconazole (fungicide with PGR properties) may be applied in the spring and fall to control annual bluegrass (Poa annua ssp. annua). Trinexapac-ethyl is a PGR which may be applied in the spring and fall for creeping bentgrass growth management. Using PRE herbicides, which inhibit cell division at the growing points, or PGRS, which inhibit cell division and cell elongation, may impact creeping bentgrass lateral growth during its maximum growth period. If lateral growth is inhibited, the open areas may be susceptible to colonization by weeds. The objective of this experiment was to determine the relative effects of PGRs and PRE herbicides on lateral recovery of creeping bentgrass. The experiment was conducted using a randomized complete block design with 4 replications on established 'Penncross' creeping bentgrass, maintained at 4 mm at the Sandhills Research Station near Pinehurst, NC. The PRE herbicides were applied using a shaker can or CO2 backpack sprayer on April 8, 1998, April 10, 1999, and again on April 3, 2000 at the following rates: dithiopyr (1 EC) at 0.6 kg ai/ha and bensulide + oxydiazon (6.56 G) at 6.7 and 1.7 kg ai/ha, respectively. PGRs were applied using a CO2 backpack sprayer once a month for 27 months beginning on April 8, 1998 at the following rates: trinexapac-ethyl (1 EC) at 0.06 kg ai/ha or at 0.1 kg ai/ha, paclobutrazol (2 SC) at 0.3 kg ai/ha, and paclobutrazol (2 SC) + cyproconazole (40 WG) at 0.3 kg ai/ha + 1.0 kg ai/ha, respectively. Cyproconazole was applied two weeks after paclobutrazol. Applying PGRs every month, instead of the just fall and spring months, sets up a worst case scenario. Every month, two soil cores (10 cm in diameter x 15 cm in length) were collected from each plot using a standard golf cup cutter, and sand was added as needed to keep the holes filled. Lateral growth of the creeping bentgrass into each cup cutting was measured with a 12 cm ruler every two weeks until complete closure. Diameter measurements were made in three directions from crown to crown (growing point to growing point). The results of lateral recovery measurements indicated that while neither preemergence herbicides nor trinexapac-ethyl neither inhibited nor accelerated the ability of 'Penncross' creeping bentgrass to spread laterally during the summer months, paclobutrazol + cyproconazole did inhibit this form of growth. Paclobutrazol + cyproconazole did inhibit this form of growth. Paclobutrazol, compared to trinexapac-ethyl at 0.1 kg ai/ha, also inhibited the ability of 'Penncross' creeping bentgrass to spread laterally during the summer months; however, neither of these treatments were significantly different from the non-treated." |
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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):
Cummings, H. D., F. H. Yelverton, D. C. Bowman, and T. W. Jr. Rufty. 2001. Lateral recovery of creeping bentgrass in response to plant growth regulators and preemergence herbicides. South. Weed Sci. Soc. Proc. 54:p. 59. |
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