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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2011 Proceedings-SWSS.pdf#page=387
Last checked: 08/06/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Perry, D. H.;
McElroy, J. S.;
Walker, R. H. |
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| Author Affiliation: | Auburn University, Auburn |
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| Title: | Temperature effects on perennial ryegrass and annual bluegrass response to amicarbazone |
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| Section: | Posters: Weed management in turf
Other records with the "Posters: Weed management in turf" Section
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| Meeting Info.: | San Juan, Puerto Rico: January 24-26, 2011 |
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| Source: | 2011 Proceedings, Southern Weed Science Society. Vol. 64, 2011, p. 279. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Agrostis stolonifera; Amicarbazone; Herbicide evaluation; Lolium perenne; Poa annua control; Temperature response
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| Cultivar Names: | Goalkeeper |
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| Abstract/Contents: | "Amicarbazone is a new herbicide being labeled for annual bluegrass (Poa annua) control in creeping bentgrass (Agrostis stolonifera) and perennial ryegrass (Lolium perenne). The objective of this research was to evaluate the effects of temperature and amicarbazone on the visual and physiological characteristics of perennial ryegrass and annual bluegrass. A growth chamber study was conducted at the Auburn University Plant Science Research Center in Auburn, Alabama. 'Goalkeeper' perennial ryegrass was seeded at 896 kg/ha and annual bluegrass was seeded at 45 kg/ha into 10 cm2 plastic pots. The soil medium was 90:10 (v/v) Wickham sandy loam : Fafard potting mix (pH - 6.0). Pots were watered daily until both species were established at which time pots were watered as necessary to prevent wilting. Plants were fertilized once per week with Miracle-Grow® (24-8-16) and mown at 2.5 cm until treatments were initiated. Plants were grown for eight weeks under greenhouse conditions and acclimated in their respective growth chambers for one week prior to treatment. One growth chamber was programmed for 14/4°C day/night conditions while the other was programmed for 24/12°C day/night conditions. Both growth chambers emitted 500 μmol/m2/s for 12 h per day. Pots were organized in randomized complete blocks with four replications within each chamber. The study was analyzed as a factorial with five treatments across two temperatures and two turf species. Treatments included amicarbazone at 0, 0.13, 0.26, or 0.53 kg/ha and bispyribac-sodium at 0.07 kg/ha. A nonionic surfactant was added to herbicide treatments at 0.25% v/v. Herbicides were applied in an enclosed spray chamber at 280 L/ha with an 8002E nozzle. Visual injury was rated at 2 and 4 weeks after treatment (WAT) on a percentage scale (0-100%) where 0 equaled no injury and 100 equaled complete death of the turf. Photochemical yield (ΦPSII) was measured utilizing a pulse-modulated chlorophyll fluorometer at 0, 24, 48, 72, 168, 336, 504, and 672 hours after application (HAA). Three ΦPSII measurements were recorded for each pot by holding the light probe at approximately 45° directly above the turf canopy. The saturation pulse width and modulation intensity were set to 0.8 s and 6, respectively. Measurements were standardized relative to the nontreated. Clipping yields were collected at 2 and 4 WAT by removing all foliage 2.5 cm above the soil surface. Clippings were oven-dried at 62°C for 72 h and weighed. Clipping data are presented as a percentage of the nontreated pots. Normality of data was confirmed using PROC GLIMMIX in SAS®. Data were subjected to ANOVA using PROC MIXED in SAS to investigate interactions between herbicide, temperature, and/or grass species. A significant herbicide rate by temperature and herbicide rate by turfgrass interaction was detected for ΦPSII data. The 0.13 and 0.26 kg/ha rates of amicarbazone initially reduced FPSII greater for annual bluegrass at 14/4°C than 24/12°C. Injury significantly increased with increasing herbicide rates as temperature increased from 14/4 to 24/12°C. The 0.53 kg/ha amicarbazone rate injured annual bluegrass 35% at 24/12°C with 76% perennial ryegrass injury at the same temperature 4 WAT. Clipping weights of annual bluegrass and perennial ryegrass decreased as amicarbazone rates increased for each temperature regime. Perennial ryegrass clipping weights were reduced greater than annual bluegrass clipping weights 2 and 4 WAT. Amicarbazone activity increased as temperature increased from 14/4 to 24/12°C, regardless of grass species. Based on these results, temperature may have a significant impact on amicarbazone visual and physiological effects to annual bluegrass and perennial ryegrass." |
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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):
Perry, D. H., J. S. McElroy, and R. H. Walker. 2011. Temperature effects on perennial ryegrass and annual bluegrass response to amicarbazone. South. Weed Sci. Soc. Proc. 64:p. 279. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2011 Proceedings-SWSS.pdf#page=387
Last checked: 08/06/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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