Full TGIF Record # 12496
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Publication Type:
Author(s):Stoltenberg, David E.; Wyse, Donald L.
Author Affiliation:Stoltenberg: Graduate Research Assistant; Wyse: Associate Professor, Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN
Title:Characterization of quackgrass Agropyron repens (L.) beauv. regrowth following post-emergence application of haloxyfop-methyl or sethoxydim
Section:Physiology, edaphic factors and control of specific weeds
Other records with the "Physiology, edaphic factors and control of specific weeds" Section
Meeting Info.:Winnipeg, Manitoba, Canada: December 4-6, 1984
Source:Proceedings: North CentralWeed Control Conference. Vol. 39, 1984, p. 81.
# of Pages:1
Publishing Information:[Urbana, Illinois: Department of Agronomy, University of Illinois]
Keywords:TIC Keywords: Elymus repens; Regrowth; Postemergence herbicides; Haloxyfop; Sethoxydim; Basipetal
Abstract/Contents:"Research has shown that herbicides such as sethoxydim, fluazifop, and haloxyfop-methyl, give reduced quackgrass control in soybeans, when applications are made at 5- to 7-leaf stage as compared to the 1- to 2- or 3- to 4-leaf stages. Therefore, the objective of this study was to investigate differential quackgrass control resulting from applications of sethoxydim or haloxyfop-mentyl to quackgrass at the 3- to 4- and 7- to 8-leaf stages. Differences in herbicide retention between the growth stages were not found to be important in contributing to reduced control at the later growth stage. Similarly, soil activity following postemergence application of herbicide was not found to be an important factor in differential quackgrass control. Following herbicide application at the 7- to 8-leaf stage, significantly more regrowth came from the crown buds as compared to outlying rhizome buds. This difference in viability between crown buds and rhizome buds following herbicide application was not noted at the 3- to 4-leaf stage. 14C-herbicide applications to the lower leaves of quackgrass in the 7- to 8-leaf stage resulted in significantly greater 14C-herbicide concentration in rhizome bud tissue than crown tissue. When labelled herbicide was applied to the upper leaves, less 14C-herbicide was translocated to the outlying rhizome system, with more label staying in the upper portion of the treated shoot. In most cases, there was no significant difference in 14C-herbicide concentration between the crown and rhizome bud tissue at the 3- to 4-leaf stage. However, application of labelled herbicide to the upper leaves reduced the amount of label translocated to the rhizome bud tissue as compared to application to the lower leaves. There were no major differences in herbicide absorption between the growth stages, however, absorption tended to be slightly less at the 7 to 8-leaf stage. Eventhough [Even though] haloxyfop-mentyl showed greater activity than sethoxydim, similar conclusion were drawn for each herbicide. We concluded that reduced quackgrass control following herbicide application at the 7- to 8-leaf stage was a result of 1) a low concentration of herbicide in the crown tissue, 2) a high capacity for shoot production by crown tissue, and 3) reduced basipetal translocation of herbicide from upper leaves as compared to lower leaves."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Stoltenberg, D. E., and D. L. Wyse. 1984. Characterization of quackgrass Agropyron repens (L.) beauv. regrowth following post-emergence application of haloxyfop-methyl or sethoxydim. Res. Rep. North Cent. Weed Control Conf. 39:p. 81.
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