Compatibility of Sethoxydim with Five Postemergence Broadleaf Herbicides

Abstract

Experiments were conducted to investigate the interactions of tank-mix combinations of sethoxydim plus the sodium salt of bentazon, the sodium salt of acifluorfen, fomesafen, imazaquin, or the ethyl ester of chlorimuron. Antagonistic interactions were observed with tank-mixes of sethoxydim plus bentazon, imazaquin, or chlorimuron applied for fall panicum, large crabgrass, and goosegrass control in field experiments. Antagonism was observed in greenhouse experiments with tank-mixes of sethoxydim plus bentazon or imazaquin applied to goosegrass. Bentazon, acifluorfen, and fomesafen reduced14C-sethoxydim uptake by large crabgrass. However, imazaquin and chlorimuron did not affect14C-sethoxydim uptake. In field experiments, no interactions occurred with tank-mixes of sethoxydim plus any of the broadleaf weed control herbicides applied to entireleaf or tall morningglory.

Herbicide Programs for Control of Glyphosate-Resistant Volunteer Corn in Glufosinate-Resistant Soybean

“…The Colby analysis also showed that the expected volunteer corn control achieved by tank mixing ACCase inhibitors and glufosinate was greater than their respective observed control at 15 DAEP (Table 3), indicating that glufosinate antagonized ACCase inhibitors. This is consistent with previous studies that have reported antagonism of the ACCase-inhibiting herbicides when tank mixed with some broadleaf herbicides (Culpepper et al 1998(Culpepper et al , 1999Holshouser and Coble 1990;Vidrine et al 1995). For instance, Burke et al (2005) reported a 50% reduction in goosegrass .…”

Interaction of 2,4-DB With Postemergence Graminicides

“…Other researchers also have reported inconsistent responses with mixtures of postemergence graminicides and various broadleafherbicides (3,15,19,21). The magnitude of antagonism we observedwhen 2,4-DB was mixed with the graminicides is similar to that observed previously with mixtures of phenoxyalkanoic acid herbicides and postemergence graminicides (5,17,22,23,24) but less than that often observedwhen other types of broadleafherbicides are mixed with the graminicides (3,19,20,22).…”

“…We observed antagonism with mixtures of sethoxydim and 2,4-DB on seedlingjohnsongrass but not on rhizomatous johnsongrass. Some researchers (11,19,21) have reported a greater likelihood of antagonism with mixtures of broadleaf herbicides and postemergence graminicides when conditions for control with the graminicides, such as soil moisture, are less than optimum. We did not observe that relationship in our experiment.…”

“…Although we did not investigate the effect of increasing graminicide rates, previous research suggests an increase in the graminicide rate likely would alleviate the antagonism (5,10,17,19,24). The cost of increasing the graminicide rate may be more than offset by the costs associated with a separate application.…”

Defining Interactions of Herbicides with Other Crop Protection Products Applied to Peanut

“…Acifluorfen and imazethapyr also can reduce efficacy of clethodim and sethoxydim (Burke and Wilcut, 2003;Grichar, 1991;Lassiter and Coble, 1987;Myers and Coble, 1992). In contrast to reduced grass control when these herbicides are co-applied, control of dicotyledonous plants and sedges is not reduced by clethodim and sethoxydim (Dotray et al, 1993;Holshouser and Coble, 1990;Isaacs et al, 2003). Efficacy of clethodim can also be reduced by acifluorfen, acifluorfen plus bentazon, bentazon, imazethapyr, imazapic, lactofen, and 2,4-DB (Grichar et al, 2002;Myers and Coble, 1992;York et al, 1993).…”