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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Scott, T. D.;
Coats, G. E. |
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| Author Affiliation: | Department of Plant and Soil Sciences, Mississippi State University, MS |
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| Title: | Synergistic combinations for Virginia buttonweed (Diodia virginiana L.) control |
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| Meeting Info.: | 51st Annual Meeting, Birmingham, AL, January 26-28, 1998 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 51, 1998, p. 73-74. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Synergism; Diodia virginiana; Weed control; Postemergence herbicides; Clopyralid; Tank mix; Application rates; 2,4-D; Mecoprop; Dichlorprop; Dicamba; Triclopyr; Herbicide interaction; Auxins
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| Abstract/Contents: | "Postemergence control of Virginia buttonweed (Diodia virginiana L.) has been inconsistent with 2,4-D and dicamba applied alone or combined. Clopyralid provides equivalent Virginia buttonweed control to 2,4-D but is less injurious to turfgrasses. Greenhouse and field experiments were conducted to determine if clopyralid combinations with other auxin-type herbicides were synergistic for control of Virginia buttonweed. Field experiments were conducted in 1996 and 1997 on Virginia buttonweed infesting a golf course driving range near Starkville, MS. Experimental design was a randomized complete block with a factorial arrangement of treatments. Factor A was clopyralid rate (0, 224, and 448 g ae/ha). Factor B consisted of 2,4D (560, 1120 g ae/ha), mecoprop (560, 1120 g ae/ha), dichlorprop (560, 1120 g ae/ha), dicamba (280, 560 g ae/ha), triclopyr (280, 560 g ae/ha), and an untreated. Virginia buttonweed density was evaluated six weeks after treatment and these data were transformed to density reduction (%), compared to densities at initiation of the experiment. Greenhouse experiments were conducted in 1996 on Virginia buttonweed plants established from seed. Experimental design was a randomized complete block with a factorial arrangement of treatments. Factor A was clopyralid rate (0, 56, 112 g ae/ha). Factor B consisted of 2,4-D (560 g ae/ha), mecoprop (560 g ae/ha), dichlorprop (560 g ae/ha), dicamba (112 g ae/ha), triclopyr (112 g ae/ha), and untreated. The study was conducted with eight replications of each treatment. At 28 days after treatment (DAT), the foliage from all replicates and the roots of the even numbered replicates were harvested. Regrowth was allowed to occur for 28 days and at 56 DAT, both foliage and roots were harvested from the remaining replicates. Foliage harvest involved removing all plant parts above the soil surface. Percent reduction in mass was then calculated based on the mass of the untreated. The data were subjected to analysis of variance with means separated using Fisher's protected LSD (P=0.05). An interaction was found for Factor A and Factor B in both the field and greenhouse studies. Colby's formula for calculating synergistic and antagonistic responses was used to evaluate herbicide combinations for Virginia buttonweed reduction. In the field study, a synergistic response occurred when 224 lb/A clopyralid was combined with 560 g/ha mecoprop, 560 or 1120 g/ha dichlorprop, 280 g/ha dicamba, or 280 g/ha triclopyr. All other herbicide combinations with 224 or 448 g/ha clopyralid were additive. Clopyralid at 224 g/ha reduced density 56% when applied alone and at least 75% in all combinations. Clopyralid at 448 g/ha reduced populations at least 81% when applied alone or combined. In the greenhouse study, foliage mass reduction at 28 DAT for all combinations of 56 g/ha clopyralid wa additive, however, combinations with 112 g/ha clopyralid were antagonistic. Root reduction for 56 g/ha clopyralid combined with 560 g/ha 2,4-D, 560 g/ha dichlorprop, or 112 g/ha triclopyr were synergistic. Dicamba or triclopyr at 112 g/ha combined with 112 g/ha clopyralid were antagonistic. All other combinations with 56 or 112 g/ha clopyralid were additive. At 56 DAT, all clopyralid combinations were synergistic for reducting foliage mass except 56 g/ha clopyralid combinded with 560 g/ha dichlorprop and 112 g/ha clopyralid combined with either 112 g/ha dicamba or triclopyr. Root mass reduction at 56 DAT was synergistic for 560 g/ha 2, 4-D or dichlorprop combined with 112 g/ha clopyralid, and also for 112 g/ha triclopyr combined with 112 g/ha clopyralid. All other clopyralid combinations at 56 DAT were additive for root mass reduction. In general, a synergistic response was found for combinations of clopyralid with other auxin-type herbicides on reduction of Virginia buttonweed density in the field and foliage regrowth mass in the greenhouse. The only combinations with consistent synergism for reduction of Virginia buttonweed density, root mass, and foliage mass after regrowth was clopyralid and triclopyr of clopyralid and dichlorprop." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: 2, 4 - D in Turf |
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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):
Scott, T. D., and G. E. Coats. 1998. Synergistic combinations for Virginia buttonweed (Diodia virginiana L.) control. South. Weed Sci. Soc. Proc. 51:p. 73-74. |
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MSU catalog number: SB 611 .S6 v.51 |
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