Full TGIF Record # 63536
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Scott, T. D.; Coats, G. E.
Author Affiliation:Scott: Arkansas State University, State University, AR 72467; Coats: Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
Title:Combinations of clopyralid with pre herbicides for virginia buttonweed (Diodia virginiana L.) control
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Meeting Info.:52nd Annual Meeting, Greensboro, NC, January 25-27, 1999
Source:Southern Weed Science Society Proceedings. Vol. 52, 1999, p. 252.
# of Pages:1
Publishing Information:Champaign, IL: Southern Weed Science Society.
Keywords:TIC Keywords: Clopyralid; Preemergence herbicides; Diodia virginiana; Weed control; Herbicide evaluation; Tank mix; 2,4-D; Dicamba; Mecoprop; Dithiopyr; Pendimethalin; Oxadiazon; Application rates
Abstract/Contents:"Virginia buttonweed continues to be a serious problem for turfgrass managers. Current recommendations for control of this perennial broadleaf weed include 2,4-D and mixtures of 2,4-D with dicamba, mecoprop, and dichloroprop; however, regrowth of from both seed and the root system has been a problem. Other studies have shown that commonly used PRE herbicides are effective for control of seedling Virginia buttonweed in turfgrass. This study was conducted to determine if clopyralid combinations with dithioyr, pendimethalin, or oxadiazon are either synergistic or antagonistic for Virginia buttonweed control. Greenhouse experiments were conducted in May and June 1997 to evaluate mixtures of clopyralid with dithiopyr, pendimethalin, or oxadiazon for Virginia buttonweed reduction. Plants were established in the greenhouse from seed collected near Aberdeen, MS. The experimental design was a randomized complete block with a two-factor factorial arrangement of treatments and 5 replicates of each treatment. Factor A was clopyralid at 0, 112, or 224 g ae ha⁻¹. Factor B was the PRE herbicide and consisted of 560 g ai ha⁻¹ dithiopyr, 3360 g ai ha⁻¹ oxadiazon, 4480 g ai ha⁻¹ pendimethalin, or an untreated. At 4 weeks after treatment (WAT) the foliage was excised and the foliage mass determined. The plants were then allowed to regrow from the roots for 4 weeks and at 8 WAT both the foliage and roots mass was determined. All plant parts above the soil were considered `foliage' and below the soil were `roots'. The percent reduction in mass was then calculated based on the mass of the untreated. The mass reduction data were subjected to analysis of variance and tested for all possible interactions of experiment ant treatment factors. No experiment interaction occurred and all data are averaged over experiments. Since and interaction was found between the treatment factors, Colby's formula was used to evaluate these herbicide combinations for reduction of Virginia buttonweed and treatment combination means were separated using Fisher's Protected LSD (p=0.05). At 4 WAT, 2 combinations were determined to be synergistic for reducing foliage mass. They were 112 g ha⁻¹ clopyralid combined with 560 g ha⁻¹ dithiopyr or 224 g ha⁻¹ clopyralid combined with 4480 g ha⁻¹ pendimethalin. At 8 WAT (after regrowth) the only combination that reduced Virginia buttonweed mass in a synergistic manner was 112 g ha⁻¹ clopyralid combined with 560 g ha⁻¹ dithiopyr. This combination was synergistic for both foliage mass and root mass reduction. All other combinations of clopyralid with PRE herbicides were additive for reduction of Virginia buttonweed root and foliage mass. The synergistic response in Virginia buttonweed control from combining clopyralid and dithiopyr may allow turfgrass managers to both effectively control Virginia buttonweed that is currently growing and slow dow the reinfestation of Virginia buttonweed from roots and seed."
Note:This item is an abstract only!
See Also:Other items relating to: 2, 4 - D in Turf
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Scott, T. D., and G. E. Coats. 1999. Combinations of clopyralid with pre herbicides for virginia buttonweed (Diodia virginiana L.) control. South. Weed Sci. Soc. Proc. 52:p. 252.
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