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Synergism of Grass Weed Control with Postemergence Combinations of SAN 582 and Fluazifop-P, Imazethapyr, or Sethoxydim

Published online by Cambridge University Press:  12 June 2017

Robert C. Scott ,
David R. Shaw ,
Randall L. Ratliff  and
Larry J. Newsom
Robert C. Scott
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
David R. Shaw
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
Randall L. Ratliff
Affiliation:
Sandoz Agro, Inc., Greenville, MS 38701
Larry J. Newsom
Affiliation:
Sandoz Agro, Inc., Greenville, MS 38701
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Abstract

Greenhouse and field experiments were conducted to evaluate early postemergence (POST) tank mixtures of SAN 582 with fluazifop-P, imazethapyr, or sethoxydim. In the greenhouse, SAN 582 synergistically improved barnyardgrass, broadleaf signalgrass, and johnsongrass control from imazethapyr and sethoxydim. Half-rates of imazethapyr and sethoxydim tank-mixed with SAN 582 controlled grass weeds as well as full rates of either herbicide applied alone. Grass weed control with imazethapyr increased up to 40% with the addition of SAN 582. In field experiments, SAN 582 increased grass control with imazethapyr to a lesser degree than observed in the greenhouse. In a multispecies study, grass weed control increased up to 15% when SAN 582 was tank-mixed with a reduced rate of imazethapyr, although the full rate of imazethapyr applied POST with or without SAN 582 controlled grass weeds 80% or less. The combination of SAN 582 with sethoxydim was synergistic for barnyardgrass and johnsongrass control in this experiment. When applied POST in soybean, SAN 582 plus fluazifop-P or sethoxydim controlled barnyardgrass throughout the season better than a single POST application of a graminicide.

Keywords

giant foxtail, Setaria faberi Herm. # SETFAgoosegrass, Eleusine indica (L.) Gaertn. # ELEINgreen foxtail, Setaria viridis (L.) Beauv. # SETVIivyleaf morningglory, Ipomoea hederacea (L.) Jacq. # IPOHEjohnsongrass, Sorghum halepense (L.) Pers. # SORHAsoybean, Glycine max (L.) Merr. ‘Northrup King 59-60.'Herbicide interactionBrachiaria platyphyllaEchinochloa crus-galliEleusine indicaIpomoea hederaceaSetaria faberiSetaria viridisSorghum halepenseBRAPPECHCGELEINIPOHESETFASETVISORHAPOST, postemergence
Type
Research
Information
Weed Technology , Volume 12 , Issue 2 , June 1998 , pp. 268 - 274
Copyright
Copyright © 1998 by the Weed Science Society of America 

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