Full TGIF Record # 12500
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Author(s):Harker, K. Neil; Dekker, Jack H.
Author Affiliation:Harker: Research Assistant; Dekker: Assistant Professor, Department of Crop Science, University of Guelph, Guelph, Ontario
Title:Temperature effects on graminicide translocation in quackgrass
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. 94.
# of Pages:1
Publishing Information:[Urbana, Illinois: Department of Agronomy, University of Illinois]
Keywords:TIC Keywords: Temperatures; Graminicide; Translocation; Elymus repens; Glyphosate; Sethoxydim; Fluazifop; Haloxyfop; Clopropoxydim; Quizalofop; Liquid scintillation counting
Abstract/Contents:"The effect of temperature on graminicide translocation in quackgrass was evaluated under controlled environmental conditions. Uniformly labelled 14C-sucrose (α -glucopyranosyl-B-D-fructofuranoside) and the radiolabelled herbicides, glyphosate, sethoxydim, fluazifop, haloxyfop (Dowco 453), clopropoxydim (RE 36290) and DPX-Y-6202 were applied to four- to five-leaf quackgrass plants adapted to three day/night temperature regimes (10/5 C, 20/15 C and 30/25C). One week after treatment the plants were harvested, lyophilized, and later sectioned, mapped, and combusted for 14C-quantification by liquid scintillation counting. Rhizome node growth was greatest at 20/15 C. Glyphosate, fluazifop and haloxyfop were most inhibitory to node growth, while sethoxydim and DPX-Y6202 were intermediate, and clopropoxydim was least inhibitory. Sucrose and glyphosate translocated more than all of the graminicides at the highest and lowest temperatures. At 20/15 C, sethoxydim and fluazifop were translocated as much as sucrose and glyphosate. A change in temperature did not affect the amount of translocation of sucrose, clopropoxydim, and DPX-Y6202. At all temperatures, only relatively small amounts of clopropoxydim and DPX-Y6202 were translocated. As temperature increased from 10/5 C to 20/15 C the translocation of sethoxydim, fluazifop and haloxyfop increased. The translocation of glyphosate increaesed as the temperature increased from 20/15 C to 30/25 C. Increasing temperature also resulted in a shift in the distribution of 14C within the plant, with a higher proportion of the translocated compounds going to the shoots than the rhizomes. Sethoxydim partitioned into the shoots more than the rhizomes as temperature increased from 10/5 C to 20/15 C. However, glyphosate, fluazifop, and halozyfop translocated more to the shoots than the rhizomes only as temperatures were increased from 20/15 C to 30/25 C. These results suggest that at temperatures when graminicides are usually applied to quackgrass (i.e. usually less than 30/25 C), sethoxydim distribution between shoots and rhizomes leads to less rhizome kill than fluazifop and haloxyfop."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Harker, K. N., and J. H. Dekker. 1984. Temperature effects on graminicide translocation in quackgrass. Res. Rep. North Cent. Weed Control Conf. 39:p. 94.
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