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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2011 Proceedings-SWSS.pdf#page=180
Last checked: 08/05/2013
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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. |
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| Author Affiliation: | Auburn University, Auburn |
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| Title: | Response of triazine-resistant annual bluegrass biotypes to amicarbazone and atrazine |
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| Section: | Weed management in turf
Other records with the "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. 72. |
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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: Amicarbazone; Anilazine; Herbicide evaluation; Herbicide resistance; Photosystem II; Poa annua control
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| Trade Names: | Triazine |
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| Abstract/Contents: | "Herbicide-resistant annual bluegrass (Poa annua) has been reported across multiple states and countries to approximately five modes of action (MOA), including photosystem II (PSII) inhibition. For years, triazine herbicides have been successfully utilized for postemergence control of annual bluegrass in dormant bermudagrass. However, it is posited that their repeated use in these situations has led to the evolution of triazine-resistant annual bluegrass populations. Target-site triazine resistance can be attributed to amino acid substitutions in the psbA A gene which codes for the D1 protein. Amicarbazone is a PSII-inhibiting g herbicide being investigated for postemergence annual bluegrass control in certain turfgrass systems and triazine-resistant annual bluegrass could potentially affect amicarbazone success. The objective of this study was to evaluate the physiological response of triazine-resistant and -susceptible annual bluegrass populations to amicarbazone. Two greenhouse studies were conducted in fall 2009 and spring 2010 at the Plant Science Research Center at Auburn University in Auburn, AL. Seed of two susceptible and two resistant annual bluegrass biotypes were seeded in 10 cm2 plastic pots and thinned to five plants per pot prior to herbicide treatment. 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. Herbicide treatments included amicarbazone (0.26 kg/ha), atrazine (1.7 kg/ha), or simazine (1.7 kg/ha) and a nontreated. Herbicides were applied with a nonionic surfactant at 0.25% v/v in an enclosed spray chamber at 280 L/ha with an 8002E nozzle. Treatments were a factorial combination of herbicide treatment and annual bluegrass biotype. Annual bluegrass control was rated on a percent scale (0-100%) where 0 equaled no control and 100 equaled complete control. Photosynthetic yield (ΦPSII) was measured 0, 1, 2, 4, 8, 16, 24, 48, 72, and 168 hours after application (HAA) using a pulse-modulated chlorophyll fluorometer. Plants were placed in artificial lighting 30 minutes prior to and during each measurement but remained in greenhouse growing conditions otherwise. ΦPSII measurements were taken by holding the light probe at approximately 45° directly above the desired annual bluegrass leaf. The saturation pulse width and modulation intensity were set to 0.8 s and 6, respectively. Two measurements were taken from two plants for a total of four measurements per pot. Measurements were calculated as a percent of the nontreated. Data were subjected to ANOVA using PROC MIXED in SAS. Amicarbazone did not reduce ΦPSII of the two resistant biotypes for any measurement timing. Amicarbazone treatment of the two susceptible biotypes reduced ΦPSII rapidly in both studies. Amicarbazone reduced ΦPSII of both susceptible biotypes significantly greater than atrazine and simazine 1-16 HAA and 1-48 HAA for study 1 and study 2, respectively. These results indicate a highly efficient PSII inhibitory nature of amicarbazone. Complete control of both susceptible biotypes was observed 2 weeks after application (WAA) with amicarbazone. Neither triazine-resistant biotype was injured following application of amicarbazone and the triazines. The absence of injury and ΦPSII reduction in triazineresistant annual bluegrass biotypes following amicarbazone treatment indicates that resistance to amicarbazone likely exists among triazine-resistant annual bluegrass biotypes." |
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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., and J. S. McElroy. 2011. Response of triazine-resistant annual bluegrass biotypes to amicarbazone and atrazine. South. Weed Sci. Soc. Proc. 64:p. 72. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2011 Proceedings-SWSS.pdf#page=180
Last checked: 08/05/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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