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| Web URL(s): | http://www.newss.org/proceedings/proceedings_2001_vol55.pdf#page=100
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Kaminski, J. E.;
Dernoeden, P. H. |
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| Author Affiliation: | Kaminski: Graduate Resident Assistant; and Dernoeden: Professor, Department of Natural Resource Sciences and LA, University of Maryland, College Park, MD |
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| Title: | Monitoring annual bluegrass emergence and its control with preemergence herbicides |
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| Section: | Turfgrass and plant growth regulators
Other records with the "Turfgrass and plant growth regulators" Section
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| Meeting Info.: | Boston Marriott Cambridge, Cambridge, MA: January 2, 3, 4, and 5, 2001 |
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| Source: | Proceedings of the 55th Annual Meeting of the NortheasternWeed Science Society. Vol. 55, 2001, p. 100-101. |
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| Publishing Information: | Ithaca, NY: Northeastern Weed Science Society |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Poa annua control; Weed emergence; Preemergence herbicides; Cynodon dactylon; Oxadiazon; Dithiopyr; Bensulide; Application rates; Weed control
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| Abstract/Contents: | "There have been no studies conducted in Maryland to monitor the seasonal emergence patterns of annual bluegrass (Poa annua L. ssp. annua). Proper timing of preemergence herbicides, based on known emergence patterns, would improve herbicide efficacy. Hence, the objectives of this study were to monitor seasonal annual bluegrass emergence patterns and to assess preemergence herbicides for efficacy in controlling P. annua. All studies were conducted at the University of Maryland Golf Club in College Park. Soil was a silt loam with a pH of 4.7 and 5.0% OM. The common bermudagrass (Cynodon dactylon L.) turf site was a rough mowed to a height of 2.5 inches. Poa annua emergence was monitored for two years. On 8 Sept 1998 and 1999, four circular spots about a square foot in area (124 to 154 sq in) were killed with a non-selective herbicide (glyphosate). Annual bluegrass seedlings were counted and removed weekly from inside each spot from 8 Oct 1998 to 14 May 1999 and from 27 Sept 1999 to 23 May 2000. Herbicides were evaluated in 1999 only and were applied on the dates footnoted in Table 1. A few P. annua seedlings were observed in the test site when the study was initiated. The site was irrigated within 48 hr of each herbicide application. Sprayable herbicides were applied in 50 gpa using a CO2 pressurized (35 psi) sprayer equipped with a flat-fan nozzle. Granulars were applied with a shaker bottle. Plots were 5 x 5 and were arranged in a randomized complete block with 4 replications. Percent of plot area covered with P. annua was assessed visually on a 0 to 100% scale where 0 = no P. annua and 100 = entire plot area covered with P. annua. During the first and second week of Oct 1998, an average of about 150 and 100 seedings sq ft-1 wk-1 emerged, respectively. By mid-Oct, however, germination declined to less than an average of 40 seedings sq ft-1 wk-1. Poa annua seedlings continued to emerge in moderate numbers (average = 17 seedlings sq ft-1 wk-1) throughout Nov and Dec, 1998. Seedling emergence was observed in small numbers (average = 3 seedlings sq ft-1 wk-1) throughout winter and into early May 1999. Over 12 inches of rain fell in early Sept 1999, following a prolonged drought. The heavy rain stimulated early emergence of P. annua and a few seedlings were observed in the study area when spots were killed on 8 Sept 1999. An average of almost 350 annual bluegrass seedlings sq ft-1 emerged between 8 Sept and 27 Sept. A large number of seedlings (i.e., > 130 seedlings sq ft-1) germinated the week prior to 5 Oct 1999. Seedling counts were generally lower (average = 36 seedlings sq ft-1 wk-1) from 11 Oct to 3 Nov. Poa annua seedlings continued to emerge in moderate numbers (average = 9 seedlings sq ft-1 wk-1) throughout Nov and Dec. A few seedlings emerged between mid-March and early May 2000, coinciding with unusually warm temperatures. Data collected in both years showed that the major emergence period of P. annua was between early Sept and mid-Nov. Low to moderate populations of seedlings, however, emerged between Dec and May of each year. Herbicide treatments with P. annua levels within or close to the acceptable threshold (i.e., <5% Poa cover) on 1 May 2000 were Ronstar (2.0 and 4.0 lb ai/A), Team Pro (3.0 lb ai/A), and Pendulum (1.5 + 1.5 lb ai/A). Dimension did not reduce P. annua cover significantly when compared to the untreated control. All other treatments reduced annual bluegrass cover, but the level of control was generally poor." |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kaminski, J. E., and P. H. Dernoeden. 2001. Monitoring annual bluegrass emergence and its control with preemergence herbicides. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 55:p. 100-101. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_2001_vol55.pdf#page=100
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 v. 53 |
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