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Effect of Ammonium Sulfate, Imazapyr, and Environment on the Phytotoxicity of Imazethapyr

Published online by Cambridge University Press:  12 June 2017

Lisa M. Kent ,
Gene D. Wills  and
David R. Shaw
Lisa M. Kent
Affiliation:
Delta Branch Exp. Stn., Stoneville, MS 38776
Gene D. Wills
Affiliation:
Delta Branch Exp. Stn., Stoneville, MS 38776
David R. Shaw
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
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Abstract

The effects of 1.24 kg ha-1 ammonium sulfate, 5 g ae ha-1 of the isopropylamine salt of imazapyr, and air temperature of 18, 27, and 35 C at 40 and 100% relative humidity on the phytotoxicity of 35 g ae ha-1 of the ammonium salt of imazethapyr applied postemergence to pitted morningglory were evaluated. Both ammonium sulfate and imazapyr increased imazethapyr phytotoxicity to pitted morningglory. Ammonium sulfate enhanced imazethapyr phytotoxicity the most at 40% whereas imazapyr was most effective at 100% relative humidity. Imazethapyr phytotoxicity was enhanced more by the combination of ammonium sulfate and imazapyr than with either alone regardless of relative humidity. Variations in temperature had little effect on phytotoxicity.

Keywords

Imazapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-pyridinecarboxylic acidimazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidpitted morningglory, Ipomoea lacunosa L. ♯ IPOLAInorganic saltimidazolinoneadjuvantIpomoea lacunosaIPOLA
Type
Research
Information
Weed Technology , Volume 5 , Issue 1 , March 1991 , pp. 202 - 205
Copyright
Copyright © 1990 by the Weed Science Society of America 

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