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| Web URL(s): | http://wssaabstracts.com/public/11/abstract-44.html
Last checked: 09/17/2012
Notes: Abstract only |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Jones, P. A.;
Brosnan, J. T.;
Breeden, G. K.;
Elmore, M. T. |
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| Author Affiliation: | University of Tennessee, Knoxville, TN |
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| Title: | Effects of rooting depth on hybrid bermudagrass (C. dactylon X. C. transvaalensis) injury with indaziflam in various soils |
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| Meeting Info.: | Philadelphia, PA: January 3-6, 2012 |
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| Source: | Proceedings: 66th Annual Meeting of the Northeastern WeedScience Society. Vol. 66, 2012, p. 40. |
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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: Cynodon dactylon x Cynodon transvaalensis; Indaziflam; Injuries; Root depth
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| Abstract/Contents: | "Indaziflam is a cellulose biosynthesis inhibitor used for annual grassy weed control in warm-season turfgrass. Bermudagrass (Cynodon spp.) injury following indaziflam treatment has been observed by turfgrass managers. Research was initiated in 2011 to determine the effect of rooting depth on bermudagrass injury with indaziflam in various soils. Hybrid bermudagrass (C. Dactylon x. C. Transvaalensis Burtt-Davey, cv. Tifway) was established from washed sod in mini-rhizotrons at the University of Tennessee in August 2011. Silica sand and silt loam soil were poured and packed into each mini-rhizotron at a density of 1.6 Mg m-3. An overhead irrigation system was used to promote active growth. Plants were maintained at a height of 3.8 cm and were fertilized weekly at 49 kg N ha-1 with a complete fertilizer (20N: 20P2O5: 20K2O). The experiment was arranged in a 2 x 3 x 6 factorial, randomized complete block, design with four replications. Plants established in each soil were treated with six herbicides once root growth had reached three depth thresholds (5, 10, and 15 cm). Herbicide treatments included indaziflam (35, 52.5, and 70 g ha-1-1), prodiamine (595 and 840 g ha-1) and oxadiazon (3360 g ha-1). An untreated control was included for comparison. Treatments were applied with a CO2-powered boom sprayer calibrated to deliver 281 L ha-1 utilizing flat-fan, 8002 nozzles at 124 kPa. Treatments were watered in (~6 mm) after application. Bermudagrass injury was visually evaluated weekly after application using a 0 (no injury) to 100 (complete kill) scale. Digital image analysis was also performed to support visual assessments of injury. At 6 weeks after treatment (WAT) roots were washed free of debris and excised as close to the crown as possible. WinRhizo software was used to characterize root length, root length density, and root surface area. Leaf tissues were also analyzed for macro- and micronutrient content. Significant soil-by-rooting depth and soil-by-treatment interactions were detected in visual injury by 5 WAT. In sand, treatments initiated at the 5 cm rooting depth injured bermudagrass 26% compared to 9% injury for treatments initiated at 10 and 15 cm. In silt loam, bermudagrass injury measured <1% at all rooting depths. When applied to bermudagrass established in sand, injury with indaziflam ranged from 24 to 41% at 5 WAT. When applied to bermudagrass established in silt loam, no indaziflam treatment resulted in significant injury compared to the untreated control. Regardless of soil, neither prodiamine and nor oxadiazon resulted in significant bermudagrass injury in this study at 5 WAT. Compared to the untreated control, all parameters of root architecture were reduced following herbicide treatment regardless of soil type or herbicide. Reductions with indaziflam on sand ranged from 81 to 90% but only 41 to 59% on silt loam. Similarly, reductions with prodiamine ranged from 68 to 70% on sand but only 17 to 37% on silt loam." |
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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):
Jones, P. A., J. T. Brosnan, G. K. Breeden, and M. T. Elmore. 2012. Effects of rooting depth on hybrid bermudagrass (C. dactylon X. C. transvaalensis) injury with indaziflam in various soils. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 66:p. 40. |
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http://wssaabstracts.com/public/11/abstract-44.html
Last checked: 09/17/2012
Notes: Abstract only |
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MSU catalog number: SB 610 .N62 |
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