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Application Rate and Timing of Acifluorfen, Bentazon, Chlorimuron, and Imazaquin

Published online by Cambridge University Press:  12 June 2017

Charles A. King  and
Lawrence R. Oliver
Charles A. King
Affiliation:
Dep. Agron., Univ. Ark., Fayetteville, AR 72703
Lawrence R. Oliver
Affiliation:
Dep. Agron., Univ. Ark., Fayetteville, AR 72703
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Abstract

Data from field studies at Fayetteville, AR, were used to predict the herbicide rate needed to provide 70, 80, or 90% control of a weed based upon weed age. Reduced herbicide rates generally needed to be applied within 6 to 12 d after emergence to control weeds 90%. Reduced rates (280 g ai ha–1 or less) of acifluorfen controlled hemp sesbania, smooth pigweed, Palmer amaranth, and pitted and entireleaf morningglory 90%. Bentazon at 350 to 650 g ai ha–1 controlled common cocklebur and prickly sida 90%. Common cocklebur, smooth pigweed, and pitted morningglory were controlled 90% with chlorimuron at 2 to 5 g ai ha–1 and imazaquin at 20 to 80 g ai ha–1. Prickly sida and hemp sesbania were controlled 90% with imazaquin at 70 g ha–1 and chlorimuron at 6 g ha–1, respectively. Barnyardgrass, large crabgrass, red rice, and sicklepod were not controlled with reduced herbicide rates.

Keywords

Acifluorfen, 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitro-benzoic acidbarnyardgrass, Echinochloa crus-galli (L.) Beauv. ♯ ECHCGcommon cocklebur, Xanthium strumarium (L.) ♯ XANSTlarge crabgrass Digitaria sanguinalis (L.) Scop. ♯ DIGSAPalmer amaranth, Amaranthus palmeri S. Wats. ♯ AMAPApitted morningglory, Ipomoea lacunosa L. ♯ IPOLAprickly sida, Sida spinosa L. ♯ SIDSPred rice, Oryza sativa L. ♯ ORYSAsicklepod, Cassia obtusifolia L. ♯ CASOBsmooth pigweed, Amaranthus hybridus L. ♯ AMACHContour graphsAMACHAMAPACASOBDIGSAECHCGIPOHGIPOLAORYSASEBEXSIDSPXANST
Type
Research
Information
Weed Technology , Volume 6 , Issue 3 , September 1992 , pp. 526 - 534
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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