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| Web URL(s): | http://www.newss.org/proceedings/proceedings_2005.pdf#page=124
Last checked: 07/22/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Kaminski, J, E.;
Dernoeden, P. H. |
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| Author Affiliation: | Kaminski: University of Connecticut, Storrs, CT; and Dernoeden: University of Maryland, College Park, MD |
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| Title: | Seasonal annual bluegrass seedling emergence patterns |
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| Section: | Turfgrass symposium
Other records with the "Turfgrass symposium" Section
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| Meeting Info.: | Capital Hilton, Washington, D.C.: January 3-6, 2005 |
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| Source: | Proceedings: NortheasternWeed Science Society. Vol. 59, 2005, p. 110. |
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| Publishing Information: | Ithaca, NY: Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Poa annua; Seedling emergence; Poa annua control; Seasonal variation; Seed dormancy; Seed germination; Temperatures; Cynodon dactylon; Environmental factors
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| Abstract/Contents: | "Annual bluegrass (Poa annua spp. annua) is a chronic weed problem of golf course turf. Few studies have been conducted to monitor annual bluegrass (ABG, annual biotype) seasonal emergence patterns or environmental conditions influencing its germination. It generally is believed that variation in ABG seed dormancy and germination timings are dependent on geographic region and environmental conditions. In a California study conducted in a vegetable field, ABG seedlings were observed to emerge in highest and lowest numbers between October and November and March and July, respectively (Weed Sci. 51:690-695). Data from the aforementioned study indicated that seed dormancy state rather than temperature likely is the primary determinant of ABG seed germination. A greenhouse study revealed that ABG germination was greatest at day/night temperatures of 19/10°C, when compared to higher temperature regimes (Weed Sci. 54:47-52). The aforementioned growth chamber study also showed that changing photoperiod had little impact on ABG seed germination. Between 1999 and 2003, ABG seedling emergence was monitored in bermudagrass (Cynodon dactylon) roughs at the University of Maryland Golf Club (UMGC) in College Park (1999-2003) and at Woodmont Country Club (WCC) in Rockville, MD (2002-2003). In August or September of 1999 to 2002, the turf in four circular spots about 0.09m2 in area was killed with glyphosate. Annual bluegrass seedlings were counted and removed weekly from inside each spot between September and May of each year. During this monitoring period, an average of 431 seedlings 0.09 m-2 year-1 emerged. Between 1999 and 2002, the majority of ABG seedlings (63 to 78%) emerged during a 3 to 4 week period between September and mid-October, and 90% of all seedlings had emerged by early-December. Annual bluegrass seedlings emerged in small numbers between December and May in all three years. In the final year (2002-2003), peak ABG germination at both locations occurred between early-October and mid-November (64 to 68%), but seedlings continued to emerge in low numbers throughout the winter. The timing of peak germination appeared to be influenced by precipitation or irrigation. In the final year, when natural precipitation was minimal in September and October, peak germination occurred 2 to 3 weeks earlier at WCC (irrigated site), when compared to UMGC (non-irrigated site). Similar to the seedling emergence patterns observed to UMGC (non-irrigates site). Similar to the seedling emergence patterns observed in California, ABG germination in Maryland was greatest during the autumn months. Several factors influence the emergence of ABG. An after-ripening period was documented for the annual biotype of ABG (Weed Research 28:365-371). It is likely that following the after-ripening period in summer, elevated soil temperatures are a limiting factor for ABG seed germination. Upon after-ripening and in the presence of suitable temparatures and moisture, ABG seeds germinate in large numbers. Annual bluegrass seed, however, may germinate in low numbers over a wide range of environmental conditions in different regions and crops." |
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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):
Kaminski, J. E., and P. H. Dernoeden. 2005. Seasonal annual bluegrass seedling emergence patterns. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 59:p. 110. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_2005.pdf#page=124
Last checked: 07/22/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 v. 57 |
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