Full TGIF Record # 33765
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Publication Type:
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Report
Content Type:Abstract or Summary only
Author(s):Studstill, D.; McCarty, L. B.; Colvin, D. L.
Author Affiliation:Department of Environmental Horticulture, University of Florida, Gainesville, FL 32611-0670
Title:Postemergence control of smutgrass (Sporobolus spp.)
Meeting Info.:Dallas, TX: January 17-19, 1994
Source:Southern Weed Science Society Proceedings. Vol. 47, 1994, p. 74-75.
Publishing Information:Champaign, IL: Southern Weed Science Society.
# of Pages:2
Keywords:TIC Keywords: Sporobolus indicus; Postemergence herbicides; Chemical control; Weed resistance to herbicides; Phytotoxicity; Asulam; Diclofop; Quinclorac; Imazaquin; MSMA; Halosulfuron
Abstract/Contents:"Smutgrass (Sporobolus spp.) is a serious weed problem in turf situations such as roadsides, pastures, and fine turf areas throughout much of the United States. Previous research on smutgrass control provided inadequate or inconsistent results, while causing excessive injury to turfgrass species and surrounding vegetation. Research was initiated at the University of Florida in 1993 with the objective of controlling smutgrass with minimal injury to fine turf and surrounding vegetation. Plots were 3.3 x 3.3 m arranged in a randomized complete block design with 4 replicates. Herbicides were applied in 187 L/ha of water with a CO2-powered backpack sprayer. Percent smutgrass density was visually rated on a 0 to 100 scale, where 0 = no cover and 100 = total cover. Also, phytotoxicity was visually rated on a scale from 1 to 10 where 5.0 = minimally acceptable and 10 = best turfgrass color. Data was collected monthly and subjected to analysis of variance. Treatments and rates (kg ai/a) included asulam at 1.1; diclofop at 0.56; quinclorac at 2.2 and 1.1; Cadre at 0.11; Cadre + imazaquin at 0.11 + 0.42 and 0.11 + 0.28; imazaquin + chlorimuron at 0.42 + 0.02 and 0.28 + 0.02; imazaquin + MSMA at 0.42 + 2.2 and 0.28 + 1.1; and halosufuron + imazaquin at 0.14 + 0.42 and 0.14 + 0.28. Crop oil, X-77, or surfactants were mixed with appropriate herbicides as recommended by manufacturers. All treatments were applied sequentially onto the same plots in July, August and September. Smutgrass density was not affected by any treatments 4 weeks after initial application (WAI). However, at 8 and 16 (WAI) Cadre applied alone in July, August, and September had 13% and 20% lower density than the untreated. Application of Cadre + imazaquin had 15% and 35% lower density than the untreated. All other treatments did not effect smutgrass density at 8 and 16 (WAI). Generally, these treatments did not affect smutgrass color throughout the length of the study. Overall, rates and timings studied provided inconsistent and/or inadequate smutgrass control. Control was best (35%) for Cadre + imazaquin while Cadre alone provided 20% control. Future research should consider repeat 1993 study to confirm results, adding other postemergence herbicides, exploring additional application timings, and determine if different smutgrass biotypes exist."
Language:English
References:0
See Also:Other items relating to: M S M A
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Studstill, D., L. B. McCarty, and D. L. Colvin. 1994. Postemergence control of smutgrass (Sporobolus spp.). South. Weed Sci. Soc. Proc. 47:p. 74-75.
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