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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Holshouser, D. L.;
Coble, H. D. |
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| Author Affiliation: | North Carolina State University |
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| Title: | Effects of Broadleaf Herbicides on Grass Control with Sethoxydim. |
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| Source: | Southern Weed Science Society Proceedings. Vol. 40, January 1987, p. 86. |
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| Publishing Information: | Nashville, TN: Southern Weed Science Society. |
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| Keywords: | TIC Keywords: Broadleaf weeds; Herbicides; Control; Sethoxydim; Eleusine indica; Panicum dichotomiflorum; Bentazon; Acifluorfen; Fomesafen
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| Abstract/Contents: | "Reductions in grass control with sethoxydim caused by tank-mixing with various broadleaf herbicides has been observed. Interactions of sethoxydim with bentazon and acifluorfen have been documented while less is known about interactions of sethoxydim with newer broadleaf soybean herbicides. These studies were conducted to determine interactions occurring in a tank mix of sethoxydim and the following broadleaf herbicides: bentazon, acifluorfen, fomesafen, imazaquin, and chlorimuron. Overcoming antagonisms by increasing sethoxydim rate along with observing environmental conditions affecting the interactions was also of interest. In 1986 field studies, tank-mix applications of bentazon at 0.84 kg ai/ha, acifluorfen at 0.56 kg ai/ha, fomesafen at 0.28 kg ai/ha, imazaquin at 0.14 kg ai/ha, or chlormuron at 0.014 kg ai/ha with sethoxydim at 0.00, 0.11, 0.22, and 0.33 kg ai/ha were applied to soybeans at the V-3 to V-4 stage. Sethoxydim at the mentioned rates was also applied alone for comparison with the tank-mixes. A similar study, with the exclusion of sethoxydim at 0.33 kg ai/ha, was conducted in 1985. Weed species used for observations included goosegrass (Eleusine indica (L.) Gaertn. #ELEIN) and fall panicum (Panicum dichotomiflorum, Michx. #PANDI). Greenhouse experiments similar to the 1986 field studies were also conducted. In these studies, all herbicide rates were reduced by half to compensate for increased herbicide activity observed in greenhouse environments. Here, the weed species used was goosegrass. The experiments were arranged as a factorial in a randomized complete block design and were analyzed by analysis of variance and polynomial orthogonal regression. Antagonistic interactions occurred when sethoxydim was tank-mixed with bentazon, acifluorfen, imazaquin, or chlorimuron for both species of grass. Generally, fomesfen exhibited no interaction with sethoxydim. Significant interactions were demonstrated between a tank-mix of bentazon, acifluorfen, or imazaquin with sethoxydim in both field and greenhouse studies. Significant interactive responses were consistently shown for chlorimuron with sethoxydim in the field, but were not duplicated in the greenhouse. Bentazon demonstrated reductions in control with sethoxydim at the lower rate and sometimes at all rates used. Under ideal environmental conditions, this antagonism was overcome by increasing the rate of sethoxydim. Acifluorfen and fomesfen demonstrated little reduction in control with sethoxydim at any rate. The observed antagonistic effect of acifluorfen on sethoxydim was offset by the grass activity of acifluorfen. Imazaquin reduced grass control with sethoxydim at all rates, regardless of environmental conditions. The only reduction in control with a tank mix of sethoxydim and chlorimuron occurred at the 0.11 kg ai/ha rate of sethoxydim. Tank mix applications of sethoxydim with broadleaf herbicides may reduce grass control, especially at lower rates of sethoxydim. Before tank mixing, consideration must be given to the broadleaf chemical, environmental conditions, and possibly increased sethoxydim rates." |
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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):
Holshouser, D. L., and H. D. Coble. 1987. Effects of Broadleaf Herbicides on Grass Control with Sethoxydim.. South. Weed Sci. Soc. Proc. 40:p. 86. |
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