Interaction of Prohexadione Calcium with Agrichemicals Applied to Peanut (Arachis hypogaea L.)

Abstract

Avariety of pesticides and foliar fertilizers are applied to emerged peanut. Defining interactions among these agrichemicals is important when formulating pest management and production strategies. Research was conducted in North Carolina during 1999 and 2000 to evaluate interactions among prohexadione calcium at 140 g ail ha applied with various commercially available fungicides, insecticides, herbicides, and foliar fertilizers. Agrichemical mixtures were applied when peanut vines reached 50% row closure. Prohexadione calcium alone was applied approximately 2 wk later. Twenty-eight percent urea ammonium nitrate was included with prohexadione calcium. In a second set of experiments, control of pitted morningglory (Ipomoea lacunosa L.) and yellownutsedge (Cyperus esculentusL.) byimazapic plus 2,4-DB, acifluorfen plus bentazon plus 2, 4-DB, bentazon plus 2, 4-DB,acifluorfen plus 2, 4-DB,pyridate plus 2,4-DB, and 2,4-DB applied alone or with prohexadione calcium were evaluated. Large crabgrass [Digitaria sanguinalis (L.) Scop.] control by sethoxydim and clethodim alone or with prohexadione calcium was evaluated also. Fungicides, insecticides, and foliar fertilizers did not affect efficacyofprohexadione calcium with respect to visible injury to peanut, row visibility, or maintenance of short stems. Slightly higher injury was

Interactions of Clethodim and Sethoxydim with Selected Agrichemicals Applied to Peanut

“…In contrast to results in these experiments, tebuconazole has not been shown previously to reduce efficacy of clethodim (Jordan et al 2003). Increases in large crabgrass control observed when prohexadione calcium plus UAN was included in various mixtures may be because of UAN rather than prohexadione calcium (Beam et al 2002b). Jordan and York (1989) reported that UAN reduced antagonism of sethoxydim caused by bentazon.…”

“…Timing of application of prohexadione calcium plus urea ammonium nitrate (UAN) can coincide with timing of application for fungicides, herbicides, and insecticides. Although Beam et al (2002b) reported that prohexadione calcium plus UAN was compatible with several fungicides, herbicides, insecticides, or foliar fertilizers when applied in two-way mixtures, compatibility with three or more components in the mixture have not been evaluated.…”

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

“…Efficacy of the herbicides acifluorfen, acifluorfen plus bentazon, bentazon, imazethapyr, imazapic, lactofen, and 2,4-DB was not affected by prohexadione calcium (Beam et al, 2002). However, other plant growth regulator products developed by agrochemical distributor chains are numerous and have not been evaluated sufficiently to make recommendations on compatibility with herbicides.…”

Influence of Application Variables on Peanut (Arachis hypogaea L.) Response to Prohexadione Calcium

“…However, some combinations of agrichemicals are not compatible (Lancaster et al, 2005). Although prohexadione calcium is compatible with the majority of agrichemicals applied to peanut (Beam et al, 2002a), efficacy of sequential applications of prohexadione calcium alone or with other products has not been evaluated.…”

“…Pyraclostrobin is a relatively new fungicide that controls several important pathogens in peanut (Shew, 2006). Although compatibility of prohexadione calcium with several fungicides applied to peanut has been documented (Beam et al, 2002a), efficacy of prohexadione calcium with pyraclostrobin has not been documented. Determining if pyraclostrobin and/or 2,4-DB are compatible with prohexadione calcium is important in developing strategies for late season weed and disease control and managing peanut vine growth.…”