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Evaluation of Weed Control and Crop Tolerance with Co-application of Glyphosate and Pyraflufen-ethyl in Glyphosate-resistant Soybean (Glycine Max)

Published online by Cambridge University Press:  20 January 2017

Derek M. Scroggs ,
Donnie K. Miller ,
Paul R. Vidrine  and
Robert G. Downer
Derek M. Scroggs*
Affiliation:
Dean Lee Research Station, LSU AgCenter, 8105 Tom Bowman Dr., Alexandria, LA 71302
Donnie K. Miller
Affiliation:
Northeast Research Station, LSU AgCenter, P. O. Box 438, St. Joseph, LA 71366
Paul R. Vidrine
Affiliation:
Dean Lee Research Station, LSU AgCenter, 8105 Tom Bowman Dr., Alexandria, LA 71302
Robert G. Downer
Affiliation:
Department of Experimental Statistics, LSU AgCenter, 161 Agriculture Administration Building, Baton Rouge, LA 70803
*
Corresponding author's E-mail: dscroggs@agctr.lsu.edu.
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Abstract

Field trials were conducted to evaluate weed control and soybean tolerance with co-application of pyraflufen-ethyl and glyphosate. Pyraflufen-ethyl applied at 11, 23, or 45 g ai/ha in combination with glyphosate did not affect control of barnyardgrass, browntop millet, redroot pigweed, sicklepod, or smellmelon compared to glyphosate alone or co-applied with chlorimuron. Initial benefit (7 DAT) to pitted morningglory control with pyraflufen-ethyl plus glyphosate compared to glyphosate alone or co-applied with chlorimuron was not observed 28 DAT. Hemp sesbania control was increased by pyraflufen-ethyl at 45 g/ha plus glyphosate and glyphosate plus chlorimuron relative to glyphosate applied alone. Pyraflufen-ethyl plus glyphosate resulted in significant visual soybean injury, and a reduction in soybean yield was observed with pyraflufen-ethyl at 45 g/ha relative to glyphosate applied alone or in combination with chlorimuron. Results from a weed-free study confirmed crop injury and yield reduction potential with pyraflufen-ethyl plus glyphosate. Overall results suggest no benefit with respect to weed control or crop tolerance to pyraflufen-ethyl inclusion in a glyphosate-resistant soybean weed control program over that observed with currently registered co-application of glyphosate and chlorimuron.

Keywords

Chlorimuronglyphosatepyraflufen-ethylbarnyardgrass, Echinochloa crus-galli (L.) Beauv. #3 ECHCGbrowntop millet, Brachiaria ramosa (L.) Stapf. # PANRAhemp sesbania, Sesbania exaltata (Raf.) Rydb. ex A. W. Hill # SEBEXpitted morningglory, Ipomoea lacunosa L. # IPOLAredroot pigweed, Amaranthus retroflexus L. # AMAREsicklepod, Senna obtusifolia L. # SENOBsmellmelon, Cucumis melo L. var. dudaim Naud. # CUMMDsoybean, Glycine max (L.) MerrCo-applicationcrop responsecrop tolerancepostemergencelf, leafPDS, post-directed sprayPPO, protoporphyrinogen oxidase
Type
Research
Information
Weed Technology , Volume 20 , Issue 4 , December 2006 , pp. 1035 - 1039
Copyright
Copyright © Weed Science Society of America 

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