Proceedings of the Sixty-first Annual Meeting of the Northeastern ...
Proceedings of the Sixty-first Annual Meeting of the Northeastern ... Proceedings of the Sixty-first Annual Meeting of the Northeastern ...
98 SEEDHEAD SUPPRESSION OF ANNUAL BLUEGRASS ON A PUTTING GREEN IN 2006. M.B. Naedel and J.A. Borger, The Pennsylvania State Univ., University Park. ABSTRACT This study was conducted on a mixed stand of 'Pencross' creeping bentgrass (Agrostis stolonifera) and annual bluegrass (Poa annua) at the Penn State Blue Golf Course in State College, PA. The objective of the study was to evaluate selected growth regulators, with and without adjuvants, for the seedhead suppression of annual bluegrass. This study was a randomized complete block design with three replications, and a plot size of 21 ft 2 . Treatments were applied on April 6 (PRIOR), April 13 (BOOT), and May 6 (3 WAT), 2006, respectively, using a three-foot CO 2 powered boom sprayer calibrated to deliver 40 gpa using one 11004E even tip/flat fan nozzle at 40 psi. Boot stage of the annual bluegrass was observed April 16, 2006. Non treated test areas within the test site revealed approximately 100% coverage of annual bluegrass seedheads. The site was maintained using cultural practices for irrigation, mowing, and fertilization that would be typical for a putting green. The test area was mowed twice with a Toro Triplex, bench set to 0.115", before the April 6, 2006 application of selected materials. During the study the site was fertilized with a Nature Safe 8-3-5 fertilizer at a rate of 1 lb N/1000 ft 2 on May 1, 2006. Turfgrass phytotoxicity was rated five times during the study. The turfgrass phytotoxicity was variable and in some cases lasted for several weeks. On the first rating date, April 24, 2005, turfgrass treated with Embark at 40 oz/A, Embark at 40 oz/A plus MacroSorb Foliar at any rate, Embark at 20 oz/A plus Primo and Proxy applies twice, Embark at 40 oz/A plus ECO-N, Proxy plus Primo plus Trimmit with or without ECO-N (BOOT), any combination of Trimmit and Embark, and Primo (PRIOR) plus Embark at 40 oz/A (BOOT) plus Ferromec (BOOT) was rated less than acceptable for phytotoxicity 7.0. Annual bluegrass seedhead suppression was rated three times during the study. On the last rating date, May 26, 2006, turfgrass treated with Embark at 40 oz/A with and without Ferromec, Embark at 40 oz/A plus MacroSorb Foliar at 8 oz/1000 ft 2 , Embark at 40 oz/A plus MacroSorb Foliar at 4 oz/1000 ft 2 , plus Ferromec, Proxy plus Primo plus ECO-N (BOOT/3 WAT), Embark at 20 oz/A (BOOT) plus Primo plus Proxy (BOOT/3 WAT), Embark at 40 oz/A plus ECO-N, Proxy plus Primo plus Trimmit plus ECO-N, Primo plus Trimmit plus Embark at 40 oz/A with and without ECO-N, Trimmit plus Embark at 40 oz/A with and without ECO-N, Proxy (PRIOR) plus Embark at 40 oz/A plus Ferromec (BOOT), Primo (PRIOR) plus Embark at 40 oz/A plus Ferromec (BOOT), ECO-N (PRIOR) plus Embark at 40 oz/A plus Ferromec (BOOT), and Embark at 40 oz/A plus Signature plus Ferromec had significantly fewer annual bluegrass seedheads than untreated turfgrass and had at least 75% reduction of the seedheads. 80
99 THE EFFECTS OF FERTILIZER ON THE TOLERANCE OF KENTUCKY BLUEGRASS TO BISPYRIBAC-SODIUM HERBICIDE. R.R. Shortell, S.A. Bonos, and S.E. Hart, Rutgers Univ., New Brunswick, NJ. ABSTRACT Kentucky bluegrass (Poa pratensis L.) is a diverse grass species used for turf that has been shown to exhibit a variable response to bispyribac-sodium herbicide, which is commonly used in other cool season turfgrasses for grassy weed control. The objective of this study was to evaluate the effects of nitrogen fertility on the tolerance of Kentucky bluegrass to this herbicide. Two trials were seeded in 2004 and 2005, respectively, at the Rutgers University Plant Science Research Center in Adelphia, NJ. Six cultivars were chosen as exemplars to represent the full range of response to this herbicide. 'Avalanche' and ‘Washington’ were used to represent the susceptible grouping with injury in excess of 80 percent, ‘Midnight’ and ‘Boutique’ were used to represent the moderate grouping with injury of 34 and 38 percent, respectively, and ‘Lakeshore’ and ‘SR 2284’ were chosen for their tolerance to this herbicide showing less then 25 percent injury. Nitrogen treatments were broken into plus or minus one pound nitrogen per 1,000 ft 2 using a homogenous 16-4-8 formulation, applied 4 days before initial herbicide applications. Bispyribac-sodium was applied at two rates (30 g a.i./A followed by 30 g a.i./A, and 60 g a.i./A followed by 60 g a.i./A) using a sequential application spaced 21 days apart in late June. Percent turfgrass injury was rated on a weekly basis and percent ground cover was noted at the completion of the study. Based on the results of this study it appears that the injury of tolerant cultivars is masked by the nitrogen application, injury in moderate cultivars is not significantly affected by the nitrogen application, and injury in the susceptible cultivars is actually increased by the application of nitrogen. The potential exists to safely use bispyribacsodium herbicide on some Kentucky bluegrass cultivars; however future research to determine the mechanisms of this response is warranted. 81
- Page 48 and 49: 48 ALFALFA/GRASS FORAGE MIXTURES US
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- Page 84 and 85: 84 BIOLOGY OF MULTIFLORA ROSE: AN I
- Page 86 and 87: 86 AN OUNCE OF PREVENTION. M.J. Van
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99<br />
THE EFFECTS OF FERTILIZER ON THE TOLERANCE OF KENTUCKY BLUEGRASS<br />
TO BISPYRIBAC-SODIUM HERBICIDE. R.R. Shortell, S.A. Bonos, and S.E. Hart,<br />
Rutgers Univ., New Brunswick, NJ.<br />
ABSTRACT<br />
Kentucky bluegrass (Poa pratensis L.) is a diverse grass species used for turf<br />
that has been shown to exhibit a variable response to bispyribac-sodium herbicide,<br />
which is commonly used in o<strong>the</strong>r cool season turfgrasses for grassy weed control. The<br />
objective <strong>of</strong> this study was to evaluate <strong>the</strong> effects <strong>of</strong> nitrogen fertility on <strong>the</strong> tolerance <strong>of</strong><br />
Kentucky bluegrass to this herbicide. Two trials were seeded in 2004 and 2005,<br />
respectively, at <strong>the</strong> Rutgers University Plant Science Research Center in Adelphia, NJ.<br />
Six cultivars were chosen as exemplars to represent <strong>the</strong> full range <strong>of</strong> response to this<br />
herbicide. 'Avalanche' and ‘Washington’ were used to represent <strong>the</strong> susceptible<br />
grouping with injury in excess <strong>of</strong> 80 percent, ‘Midnight’ and ‘Boutique’ were used to<br />
represent <strong>the</strong> moderate grouping with injury <strong>of</strong> 34 and 38 percent, respectively, and<br />
‘Lakeshore’ and ‘SR 2284’ were chosen for <strong>the</strong>ir tolerance to this herbicide showing less<br />
<strong>the</strong>n 25 percent injury. Nitrogen treatments were broken into plus or minus one pound<br />
nitrogen per 1,000 ft 2 using a homogenous 16-4-8 formulation, applied 4 days before<br />
initial herbicide applications. Bispyribac-sodium was applied at two rates (30 g a.i./A<br />
followed by 30 g a.i./A, and 60 g a.i./A followed by 60 g a.i./A) using a sequential<br />
application spaced 21 days apart in late June. Percent turfgrass injury was rated on a<br />
weekly basis and percent ground cover was noted at <strong>the</strong> completion <strong>of</strong> <strong>the</strong> study.<br />
Based on <strong>the</strong> results <strong>of</strong> this study it appears that <strong>the</strong> injury <strong>of</strong> tolerant cultivars is<br />
masked by <strong>the</strong> nitrogen application, injury in moderate cultivars is not significantly<br />
affected by <strong>the</strong> nitrogen application, and injury in <strong>the</strong> susceptible cultivars is actually<br />
increased by <strong>the</strong> application <strong>of</strong> nitrogen. The potential exists to safely use bispyribacsodium<br />
herbicide on some Kentucky bluegrass cultivars; however future research to<br />
determine <strong>the</strong> mechanisms <strong>of</strong> this response is warranted.<br />
81
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