Full TGIF Record # 223546
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Web URL(s):http://www.newss.org/proceedings/proceedings_2007.pdf#page=105
    Last checked: 07/01/2013
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Askew, S. D.; Goddard, M. J.; Willis, J. B.
Author Affiliation:Virginia Tech, Blacksburg
Title:Methods to assess environmental influence on turfgrass response to mesotrione
Section:Turfgrass and plant growth regulators
Other records with the "Turfgrass and plant growth regulators" Section
Meeting Info.:Baltimore, Maryland: January 2-5, 2007
Source:Proceedings of the Sixty-First Annual Meeting of the Northeastern Weed Science Society. Vol. 61, 2007, p. 87.
Publishing Information:Baltimore, Maryland: Northeastern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Fine fescues; Herbicide evaluation; Herbicide injury; Lolium perenne; Mesotrione
Abstract/Contents:"Mesotrione is expected to be available for turfgrass markets Spring 2008. Of several turfgrass species known to tolerate mesotrione treatment, perennial ryegrass (PRG)(Lolium perenne) and fine fescue (Festuca spp.) are among the most sensitive. The visual manifestation of turfgrass injury from mesotrione is striking and ranges from a dull yellow to bright white. It is hard to predict when turfgrass will be discolored by mesotrione. In several field trials since 2001, we have observed turfgrass responses to mesotrione 4 SC at 0.14 to 0.28 kg ai/ha range from no effect to completely white foliage. Studies were conducted in 2006 at three field locations and in growth chambers in Blacksburg, VA to evaluate the influence of various environmental conditions on PRG and hard fescue (Festuca longifolia) response to mesotrione. In growth chamber studies, mesotrione was applied at 0, 0.14, 0.21, and 0.28 kg ai/ha to PRG maintained at daytime and nighttime temperatures of 13 and 7, 18 and 13, 24 and 18, and 30 and 24 C, respectively. PRG was placed in 15 cm x 15 cm pots and maintained at 2.5 cm in height. Chlorophyll b and a + b levels decreased by 750 μg g-1 fresh weight and 2970 μg g-1 fresh weight, respectively, for each 100g increase in herbicide rate. Carotenoid levels were strongly temperature dependent and followed a quadratic response with peak carotenoid production (820 μg g-1 fresh weight) occurring near 25C, the plants growth optimum. In field trials, weather stations (Spectrum Technologies) were installed at each site to monitor soil moisture, soil temperature, air temperature, dew period, solar radiation, and photosynthetically active radiation every 30 minutes. Mesotrione was applied at 0.14 kg ai/ha each week between March 8, 2006 and September 4, 2006. A sample of leaf tissue was collected just prior to treatments, 5 days after treatment (DAT) and 10 DAT. At each evaluation timing, leaf tissue was assayed for cuticle wax weight, carotenoids, and chlorophyll a and b. Plots were also evaluated for color both visually and with digital image analysis. Principle component analysis (PCA) techniques and regressions were used to determine correlations between measured environmental conditions and observed treatment responses. The PCA analysis indicates some correlation between carotenoids and several environmental conditions. However, correlation between visual injury responses due to mesotrione and environmental conditions will likely be complicated. As with other carotenoid synthesis inhibitors, the greatest amount of white tissue occurs during maximum plant growth, as white tissue is typically evident on new leaves. Several factors, however, can influence plant growth including a combination of abiotic factors or even biotic factors such as disease. Thus, turfgrass injury response will be difficult to predict based on environmental conditions before and after treatment. Turfgrass growth rate will likely be the best predictor of injury responses, with increase growth resulting in increased chances for white foliage. Preliminary studies also indicate that conditions that promote foliar absorption of mesotrione, such as high humidity, will also contribute to turfgrass injury. Our future work will evaluate absorption as a contributing factor."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Askew, S. D., M. J. Goddard, and J. B. Willis. 2007. Methods to assess environmental influence on turfgrass response to mesotrione. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 61:p. 87.
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http://www.newss.org/proceedings/proceedings_2007.pdf#page=105
    Last checked: 07/01/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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