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Interacting effects of MON 12000 and CGA-152005 with other herbicides in velvetleaf (Abutilon theophrasti)

Published online by Cambridge University Press:  12 June 2017

Stephen E. Hart
Stephen E. Hart*
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
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Abstract

Greenhouse and laboratory studies were conducted to determine the effects of dicamba, atrazine, and bentazon on efficacy, foliar absorption, and translocation of MON 12000 or CGA-152005 applied to velvetleaf. The efficacy of MON 12000, CGA-152005, and a combination of CGA-152005 plus primisulfuron applied at 4.5 g ai ha−1 was similar when applied alone or with 140 g ha−1 of dicamba. However, applying these herbicides in combination with 840 or 560 g ha−1 of atrazine or bentazon, respectively, reduced velvetleaf control. Increasing the rate of MON 12000, CGA-152005, or the combination of CGA-152005 plus primisulfuron to 9 g ai ha−1 or replacing crop oil concentrate (COC) with methylated seed oil (MSO) increased velvetleaf control of the atrazine and bentazon combinations but not to levels equal to these herbicides applied alone. Dicamba had no effect on the foliar absorption and translocation of 14C from MON 12000 or CGA-152005. Atrazine had little effect on foliar absorption of 14C from MON 12000 or CGA-152005, but bentazon reduced the foliar absorption of 14C from MON 12000. Replacing COC with MSO increased the foliar absorption of 14C from MON 12000 or CGA-152005 applied alone or with dicamba or atrazine, but not with bentazon. Translocation of 14C from MON 12000 or CGA-152005 out of the treated leaves was 11 and 12%, respectively, averaged across adjuvants and sampling times. These values were reduced to an average of 3 to 4% for both MON 12000 and CGA-152005 when applied in combination with atrazine or bentazon. The majority of 14C from MON 12000 or CGA-152005 was translocated acropetally. Atrazine and bentazon significantly reduced the acropetal translocation of 14C from MON 12000 at 24 and 72 h and for CGA-152005 at 12, 24, and 72 h. The physiological basis for the observed antagonism of MON 12000 and CGA-152005 by atrazine and bentazon appears to be due to reductions in acropetal translocation of MON 12000 and CGA-152005 to velvetleaf meristems.

Keywords

Atrazine, [6-cloro-N-ethyl-N&-(1-methylethyl)-1,3,5-traizine-2,4-diamine], bentazon, [3-(1-methylethyl)-(1H)-2,1,3-benzothiadizin-4(3H)-one 2,2-dioxide]CGA-152005, {1-(4-methoxy-6-methyl-triazin-2-yl)-3-[2-(3,3,3-trifluoropropyl)-phenylsulfonyl]-urea}dicamba, 3,6-dichloro-2-methoxybenzoic acidMON 12000, (methyl 5-[[(4,6-dimethoxy-2-pyrimidinyl) amino] carbonylaminosulfonyl]-3-chloro-1-methyl-1-H-pyrazole-4-carboxylate)primisulfuron, 2-[[[[[4,6-bis-(difluromethoxy)-2-pyrimidinyl]amino]carbonyl]amino]sulfonyl]benzoic acidvelvetleaf, Abutilon theophrasti Medicus ABUTHHerbicide antagonismAbutilon theophrastiABUTH
Type
Weed Management
Information
Weed Science , Volume 45 , Issue 3 , June 1997 , pp. 434 - 438
Copyright
Copyright © 1997 by the Weed Science Society of America 

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