Interactions of Clethodim and Sethoxydim with Selected Agrichemicals Applied to Peanut

Abstract

Experiments were conducted in North Carolina during 2002 and 2003 to evaluate broadleaf signalgrass and large crabgrass control by clethodim and sethoxydim applied in two-, three-, or four-way mixtures with fungicides, insecticides, and foliar fertilizer–plant growth regulator treatments. Broadleaf signalgrass and large crabgrass control by clethodim and sethoxydim was not reduced by the insecticides esfenvalerate, indoxacarb, or lambda-cyhalothrin. The fungicides azoxystrobin, chlorothalonil, pyraclostrobin, and tebuconazole reduced large crabgrass control by clethodim or sethoxydim in one or more of three experiments for each herbicide. Disodium octaborate and the plant growth regulator prohexadione calcium plus urea ammonium nitrate (UAN) mixed with clethodim and fungicides improved large crabgrass control in some experiments. In contrast, prohexadione calcium plus UAN and disodium octaborate did not affect broadleaf signalgrass or large crabgrass control by sethoxydim.

Influence of Glyphosate or Glufosinate Combinations with Growth Regulator Herbicides and Other Agrochemicals in Controlling Glyphosate-Resistant Weeds

“…With the availability of soybean varieties having glyphosate-or glufosinate-resistance stacked with dicamba-or 2,4-D-resistance genes, the probability that these herbicides might be applied simultaneously with other pesticides including insecticides, fungicides, and fertilizers will be high. Applying these products in combination often is preferred by growers due to convenience, time savings, and reduced application and labor costs (Lancaster et al 2005). Despite these benefits, incompatibility can occur with certain pesticide or pesticide plus fertilizer mixtures.…”

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

“…However, there is considerable interest in compatibility of three or more pesticides, micronutrients, adjuvants, or plant growth regulators and their impact on pest control and crop management. With respect to weed control, efficacy of clethodim, sethoxydim, and 2,4-DB were compared when these herbicides were applied alone or with fungicides and insecticides (Jordan et al, 2003a;Lancaster et al, 2005aLancaster et al, 2005b. Although results often supported previous findings with components from two groups of pesticides, no clear relationships were established with respect to combinations of three or more pesticides (Lancaster et al, 2005a(Lancaster et al, 2005b.…”

“…Efficacy of clethodim and sethoxydim can be reduced by co-application with coppercontaining fungicides or azoxystrobin, chlorothalonil, and pyraclostrobin (Jordan et al, 2003a;Lancaster et al, 2005aLancaster et al, 2008. Fluazinam and tebuconazole did not reduce grass control compared with graminicides applied alone (Jordan et al, 2003a;Lancaster et al, 2005aLancaster et al, 2005b. Efficacy of herbicides that control dicotyledonous and sedge weeds is not generally affected by fungicides (Jordan et al, 2003a).…”

“…Occasionally, these can affect herbicide performance. For example, efficacy of clethodim and imazethapyr was reduced by micronutrients for some, but not all, weeds evaluated (Jordan et al, 2006;Lancaster et al, 2005b).…”

“…With respect to weed control, efficacy of clethodim, sethoxydim, and 2,4-DB were compared when these herbicides were applied alone or with fungicides and insecticides (Jordan et al, 2003a;Lancaster et al, 2005aLancaster et al, 2005b. Although results often supported previous findings with components from two groups of pesticides, no clear relationships were established with respect to combinations of three or more pesticides (Lancaster et al, 2005a(Lancaster et al, 2005b. More recently, research is being conducted to compare herbicide efficacy with mixtures containing various levels of fungicide, insecticide, micronutrient, or adjuvant (Chahal et al, 2009a(Chahal et al, 2009b.…”