Full TGIF Record # 21495
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Author(s):Kopec, D. M.; Heathman, E. S.; Dobrenz, A. K.; Moharram, H. N.
Author Affiliation:Turf and pasture grass specialist, University of Arizona Cooperative Extension; Professor Emeritus ,University Arizona; assistant professor, University Arizona; Professor of Agronomy at UA; graduate assistant UA
Title:Response of purple nutsedge to turfgrass competition and imazaquin herbicide
Source:Golden State Fairways. Vol. 2, No. 4, Fourth quarter 1989, p. 28-29.
Publishing Information:Las Vegas: R/K Communications Group, Inc.
Keywords:TIC Keywords: Cyperus rotundus; Imazaquin; Herbicides; Research
Abstract/Contents:"Purple nutsedge (Cyperus rontundus) is a persistent weed in lower elevation turfs in Arizona. Its high elongation rate, coarse leaf texture, and light green color are objectionable in turfgrass stands. This study was conducted to determine the effects of turfgrass cultivar, mowing height and imazaquin herbicide on purple nutsedge supression over 1988 and 1989 growing season. During both years, `Midiron' bermuda was not as competitive as `Tifway' bermudagrass when no herbicide was applied. `Midiron' was influenced by mowing, allowing for 60 cm2 infestations levels at the (1.9 cm) mowing height during midsummer of both years. With repeat applications, purple nutsedge was greatly reduced during the first year (1988), and essentially eliminated in the more aggressive `Tifway' turf after an early summer application in year two (1989). Control of purple nutsedge is problematic, due to the competitiveness of the weed and the subsequent regrowth from tubers. Nutsedge infestation was determined in cm2 by tracing and shading the surface area meter. Following early and midsummer growth during year two, turf infestation levels increased to 60 and 32 cm2 for `Midiron' at the low and high mowing heights, respectively, when no herbicide was applied, again demonstrating the inability of `Madiron' to compete, especially under the increased mowing stress. The untreated 'Tifway' had approximately a 20 cm-2 infestation, regardless of mowing heights during July and August, further decreasing to 5 and 1 cm mean infestations in late September and August, respectively. Throughout the experiment, chemical and cultivar effects were always significant, resulting from the increased innate competition of the 'Tifway' over the 'Midiron' turf, as well as the overall reduction due to the imazaquin."
Reprinted in Golden State Fairways, November 1990, Vol 2, Issue 4.
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kopec, D. M., E. S. Heathman, A. K. Dobrenz, and H. N. Moharram. 1989. Response of purple nutsedge to turfgrass competition and imazaquin herbicide. Golden State Fairways. 2(4):p. 28-29.
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