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Weed Control, Yield, and Net Returns Using Imazethapyr in Peanuts (Arachis hypogaea L.)

Published online by Cambridge University Press:  12 June 2017

John W. Wilcut ,
F. Robert Walls Jr.  and
David N. Horton
John W. Wilcut
Affiliation:
Tidewater Agric. Exp. Stn., Virginia Polytechnic Inst. & State Univ., Suffolk, VA 23437
F. Robert Walls Jr.
Affiliation:
American Cyanamid Corp., Goldsboro, NC 27530
David N. Horton
Affiliation:
Agric. Res. Sci., Tidewater Agric. Exp. Stn.
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Abstract

Field experiments were conducted in 1988 and 1989 to evaluate imazethapyr for weed control in peanuts. Imazethapyr was applied PRE or POST at 3, 5, or 7 weeks after crop emergence (WAE) at 0.071 kg ai ha–1. Imazethapyr applied PRE controlled common lambsquarters 85%, prickly sida 92%, and a mixture of entireleaf, ivyleaf, pitted, and tall morningglory species 77%. Morningglory control was at least 91% with imazethapyr plus metolachlor PRE followed by imazethapyr plus 2,4–DB or imazethapyr plus acifluorfen at 3, 5, or 7 WAE. Yields from systems that included metolachlor plus imazethapyr PRE followed by imazethapyr plus acifluorfen, imazethapyr plus 2,4–DB, or acifluorfen plus 2,4–DB at 3 WAE were greater than yields from the handweeded check. All systems with imazethapyr plus metolachlor PRE followed by any POST treatment except imazethapyr plus acifluorfen 7 WAE provided net returns equivalent to the herbicide standard of metolachlor PRE and acifluorfen and bentazon plus 2,4–DB 3 WAE. All systems except imazethapyr PRE provided greater net returns than the handweeded weed–free check.

Keywords

Acifluorfen, 5–[2–chloro–4–(trifluoromethyl)phenoxy]–2–nitrobenzoic acidbentazon, 3–(1–methylethyl)–(1H)–2,1,3–benzothiadiazin–4(3H)–one 2,2–dioxideimazethapyr, (±)–2–[4,5–dihydro–4–methyl–4–(1–methylethyl)–5–oxo–1H–imidazol–2–yl]–5–ethyl–3–pyridinecarboxylic acidmetolachlor, 2–chloro–N–(2–ethyl–6–methylphenyl)–N–(2–methoxy–1–methylethyl)acetamide2,4–DB, 4–(2,4–dichlorophenoxy)butanoic acidcommon lambsquarters, Chenopodium album L. # CHEALentireleaf morningglory, Ipomoea hederacea var. integriuscula Gray # IPOHGivyleaf morningglory, Ipomoea hederacea (L.) Jacq. # IPOHEpitted morningglory, Ipomoea lacunosa L. # IPOLAprickly sida, Sida spinosa L. # SIDSPtall morningglory, Ipomoea purpurea (L.) Roth. # PHBPUpeanut, Arachis hypogaea L. ‘Florigiant’Economic analysisnet returnsSIDSPCHEALIPOLAIPOHEIPOHGPHBPU
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 39 , Issue 2 , June 1991 , pp. 238 - 242
Copyright
Copyright © 1991 Weed Science Society of America 

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References

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