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Toxicity of Imazethapyr to Purple (Cyperus rotundus) and Yellow Nutsedges (C. esculentus)

Published online by Cambridge University Press:  12 June 2017

John S. Richburg III ,
John W. Wilcut  and
Glenn R. Wehtje
John S. Richburg III
Affiliation:
Dep. Agron., Univ. Georgia, Box 748, Tifton, GA 31793-0748
John W. Wilcut
Affiliation:
Dep. Agron., Univ. Georgia, Box 748, Tifton, GA 31793-0748
Glenn R. Wehtje
Affiliation:
Dep. Agron. and Soils and AL Agric. Exp. Stn., Auburn Univ., Auburn, AL 36849-5432
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Abstract

Greenhouse studies were conducted to determine the response of purple and yellow nutsedges to selective soil placement of 5 cm of soil treated with imazethapyr above and/or below the nutsedge tubers. Early postemergence (EPOST) or postemergence (POST) imazethapyr treatments at 71 g ai/ha as a foliar, soil, or foliar + soil application was also evaluated. Imazethapyr placement above or below the nutsedge tuber generally increased shoot number, shoot dry weight (SW), shoot regrowth dry weight (SRW), and root tuber dry weight (RTW) production in both species, 28 and 42 days after treatment (DAT) compared with the control. However, the 5-cm above + 5-cm below tuber treatment at 14, 28, and 42 DAT reduced purple nutsedge shoot number, SW, SRW, and RTW to 19, 7, 14, and 26% of the control, respectively. Yellow nutsedge shoot number was 103% of the control with the 5-cm above + 5-cm below tuber treatment 42 DAT. The 5-cm above + 5-cm below tuber treatment reduced yellow nutsedge SW, SRW, and RTW to 43, 44, and 23% of the control, respectively, 28 and 42 DAT. EPOST and POST foliar + soil and soil-only applications reduced SW 28 d after treatment (DAT) to 13% or less of the control for both species. SRWs of both species were ≤ 53% of the control 42 DAT for the soil-only application. The foliar-only treatment was the least effective in SW, SRW, and RTW reductions.

Keywords

Imazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidpurple nutsedge, Cyperus rotundus L. # CYPROyellow nutsedge, Cyperus esculentus L. # CYPESApplication methodapplication timingselective placementCYPESCYPRO
Type
Research
Information
Weed Technology , Volume 7 , Issue 4 , December 1993 , pp. 900 - 905
Copyright
Copyright © 1994 by the Weed Science Society of America 

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