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Behavior of Imazethapyr in Soybeans (Glycine max), Peanuts (Arachis hypogaea), and Selected Weeds

Published online by Cambridge University Press:  12 June 2017

Tracy A. Cole ,
Glenn R. Wehtje ,
John W. Wilcut  and
T. Vint Hicks
Tracy A. Cole
Affiliation:
Dep. Agron. and Soils and Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
Glenn R. Wehtje
Affiliation:
Dep. Agron. and Soils and Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
John W. Wilcut
Affiliation:
Virginia Polytech. Inst. and State Univ., Tidewater Agric. Exp. Stn., Suffolk, VA 23437
T. Vint Hicks
Affiliation:
Dep. Agron. and Soils and Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
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Abstract

Imazethapyr was applied at 0.14 kg ae/ha to soybean, peanut, sicklepod. Florida beggarweed, and redroot pigweed as either a soil, foliar, or soil plus foliar application. Soybean and peanut were the most tolerant species; redroot pigweed was the most sensitive, with sicklepod and Florida beggarweed being intermediate. Foliar or foliar plus soil applications were more effective in reducing sicklepod and Florida beggarweed fresh weights than soil application alone. Foliar absorption of 14C-imazethapyr 72 h after treatment was greater than 90% for soybean, peanut, sicklepod, and redroot pigweed, but only 77% in Florida beggarweed. For the species evaluated, the amount translocated from the treated leaf ranged from 5 to 16% after 72 h. Within this same time period, an average of 90% of the root-absorbed imazethapyr had been translocated to the shoot in all species except peanut. The half-life of imazethapyr was 6.6, 6.5, 14.4, 24.0, and 32.1 days in soybean, peanut, Florida beggarweed, sicklepod, and redroot pigweed, respectively. Tolerance was most closely associated with imazethapyr half-life within these species.

Keywords

Imazethapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl) − 5 - oxo − 1H-imidazol-2-yl]-5-ethyl-3-pyridine-carboxylic acidsoybean, [Glycine max (L.) Merr. ‘Braxton’]peanut, (Arachis hypogaea L. ‘Florunner’)sicklepod, (Cassia obtusifolia L. ♯3 CASOB)redroot pigweed, (Amaranthus retroflexus L. ♯ AMARE)Florida beggarweed [Desmodium tortuosum (SW.) DC ♯ DEDTO]Half-lifemetabolismabsorptiontranslocationCASOBDEDTOAMARE
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 37 , Issue 5 , September 1989 , pp. 639 - 644
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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