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Evaluation of Imazethapyr for Weed Control in Leafy Vegetable Crops

Published online by Cambridge University Press:  12 June 2017

Joan A. Dusky  and
William M. Stall
Joan A. Dusky
Affiliation:
Everglades Res. Educ. Cent., Univ. Florida, Belle Glade, FL 33430
William M. Stall
Affiliation:
Dep. Hortic. Sci., Univ. Florida, Gainesville, FL 32611
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Abstract

Imazethapyr was evaluated PRE and POST in five lettuce types and chicory under Florida field conditions. The relative sensitivity of leafy crop vigor (most sensitive to most tolerant) to imazethapyr PRE, based on 20% inhibition determined using regression analysis, was as follows: Boston > bibb > crisphead > romaine > leaf > escarole > endive. Leafy crop injury increased as the rate of imazethapyr applied POST increased, with all leafy crops responding in a similar manner. Surfactant addition increased imazethapyr phytotoxicity. Imazethapyr PRE treatments at 0.067 kg ai/ha provided greater than 80% control of livid amaranth, common purslane, flatsedge, and common lambsquarters. Imazethapyr POST at 0.067 kg/ha, with surfactant provided control greater than 85% of all weed species. Greater than 85% spiny amaranth control was provided by imazethapyr POST at 0.017 kg/ha. Use of surfactant with imazethapyr did not improve spiny amaranth control over imazethapyr with no surfactant. POST treatments did not decrease leafy crop yield compared with the hand-weeded check. Imazethapyr applied PRE reduced crop yield compared to the POST treatments and the hand-weeded control.

Keywords

Imazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methyethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidlivid amaranth, Amaranthus lividus L. # AMALIspiny amaranth, Amaranthus spinosus L. # AMASPcommon lambsquarters, Chenopodium album L. # CHEALflatsedge, Cyperus odoratus L. # CYPFEcommon purslane, Portulaca oleracea L. # POROLchicory, Cichorium endiva L.lettuce, Lactuca sativa L.Vegetable weed controlAMALIAMASPCHEALCYPFEPOROL
Type
Research
Information
Weed Technology , Volume 10 , Issue 2 , June 1996 , pp. 253 - 257
Copyright
Copyright © 1996 by the Weed Science Society of America 

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