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Purple Nutsedge (Cyperus rotundus) and Sicklepod (Senna obtusifolia) Response to Glyphosate Mixtures with ALS-Inhibiting Herbicides

Published online by Cambridge University Press:  12 June 2017

A. Subrahmanyeswara Rao  and
Krishna N. Reddy
A. Subrahmanyeswara Rao
Affiliation:
Southern Weed Science Research Unit, U.S. Department of Agriculture, Agricultural Research Service, P.O. Box 350, Stoneville, MS 38776
Krishna N. Reddy*
Affiliation:
Southern Weed Science Research Unit, U.S. Department of Agriculture, Agricultural Research Service, P.O. Box 350, Stoneville, MS 38776
*
Corresponding author's E-mail: kreddy@ag.gov.
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Abstract

Greenhouse studies were conducted to evaluate potential interactions among glyphosate mixtures with five acetolactate synthase (ALS)-inhibiting herbicides (chlorimuron, imazamox, imazaquin, MON 12,000, or pyrithiobac) for the control of purple nutsedge and sicklepod at two growth stages. Herbicides were tested alone at 0.5X and 1X rates (1X being suggested use rate for these herbicides) and in combination with glyphosate at 560 (0.5X) and 1,120 (1X) g ai/ha on 3-wk-old plants and at 1,120 g/ha on 6-wk-old plants. Glyphosate alone at 1,120 g/ha gave complete control of purple nutsedge and at least 78% control of sicklepod regardless of growth stage. In 3-wk-old purple nutsedge plants, three of the 20 herbicide combinations were antagonistic and 17 combinations were additive, whereas all five combinations were additive in 6-wk-old plants. In sicklepod, eight combinations were antagonistic and 12 combinations were additive in 3-wk-old plants, and all five combinations were antagonistic in 6-wk-old plants. In 3-wk-old plants, the glyphosate (0.5X) plus imazaquin (0.5X) combination resulted in highest antagonism in purple nutsedge control (79%), and the combination of glyphosate (0.5X) plus imazamox (0.5X) resulted in highest antagonism in sicklepod control (54%). These results indicate that mixing chlorimuron, imazamox, imazaquin, MON 12,000, or pyrithiobac with glyphosate does not increase glyphosate efficacy on purple nutsedge or sicklepod.

Keywords

Chlorimuron, ethyl 2-[[[[4-chloro-6-methoxy-2-pyrimidinyl)amino]carbonyl]amino] sulfonyl]benzoateglyphosate, isopropylamine salt of N-(phosphonomethyl) glycineMON 12,000 (proposed common name, halosulfuron), methyl 5-[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl aminosulfonyl]-3-chloro-1-methyl-1-H-pyrazole-4-carboxylateimazamox, ammonium salt of 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-(methoxymethyl)-3-pyridinecarboxylic acidimazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imadazol-2-yl]-3-quinolinecarboxylic acidpyrithiobac, sodium salt of 2-chloro-6-[(4,6-dimethoxy-2-pyrimidinyl)thio]benzoic acidpurple nutsedge, Cyperus rotundus L. #CYPROsicklepod, Senna obtusifolia (L). Irwin and Barneby # CASOBAdditiveantagonismchlorimuronimazamoximazaquininteractionsMON 12,000pyrithiobacCYPROCASOBALS, acetolactate synthasePOST, postemergenceWAA, weeks after application
Type
Research
Information
Weed Technology , Volume 13 , Issue 2 , June 1999 , pp. 361 - 366
Copyright
Copyright © 1999 by the Weed Science Society of America 

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Footnotes

Current address of first author: Associate Professor, Department of Agronomy, Agriculture College, Acharya N. G. Ranga Agricultural University, Aswaraopet 507 301, Khammam District, Andhra Pradesh, India.

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