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Response of Selected Weed Species to Postemergence Imazethapyr and Bentazon

Published online by Cambridge University Press:  12 June 2017

Troy A. Bauer ,
Karen A. Renner  and
Donald Penner
Troy A. Bauer
Affiliation:
Michigan State Univ., East Lansing, MI 48824-1325
Karen A. Renner
Affiliation:
Michigan State Univ., East Lansing, MI 48824-1325
Donald Penner
Affiliation:
Michigan State Univ., East Lansing, MI 48824-1325
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Abstract

Imazethapyr and bentazon were applied with petroleum oil adjuvant in a factorial arrangement to weed species in greenhouse and field research to determine if postemergence weed control by imazethapyr was antagonized when bentazon was tank-mixed. Tank-mixing 840 g/ha of bentazon with 13 or 27 g/ha of imazethapyr increased redroot pigweed and eastern black nightshade dry weight as compared to Colby's expected values in the greenhouse. However, weed control was not reduced in field studies. Subsequent greenhouse studies indicated that soil interception and resulting root uptake of imazethapyr increased redroot pigweed control. Bentazon decreased foliar absorption of 14C-imazethapyr by 15% and translocation of 14C from the treated leaf by more than 50% compared to l4C-imazethapyr applied alone.

Keywords

Bentazon, 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxideimazethapyr, 2-[4,5-dihydro-4-methyl-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acideastern black nightshade (Solanum ptycanthum Dun.) # SOLPTredroot pigweed (Amaranthus retroflexus L.) # AMAREAbutilon theophrastiAmaranthus retroflexusAmbrosia artemisiifoliaChenopodium albumSolanum pytcanthumABUTHAMAREAMBELCHEALSOLPTantagonisminteraction
Type
Research
Information
Weed Technology , Volume 9 , Issue 2 , June 1995 , pp. 236 - 242
Copyright
Copyright © 1995 by the Weed Science Society of America 

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