Full TGIF Record # 12494
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Title:Field evaluation of postemerence grass herbicide antagonism with bentazon
Section:Soybeans, beans, sugarbeets and new herbicides
Other records with the "Soybeans, beans, sugarbeets and new herbicides" Section
Meeting Info.:Winnipeg, Manitoba, Canada: December 4-6, 1984
Source:Proceedings: North CentralWeed Control Conference. Vol. 39, 1984, p. 36.
# of Pages:1
Publishing Information:[Urbana, Illinois: Department of Agronomy, University of Illinois]
Keywords:TIC Keywords: Evaluations; Postemergence herbicides; Antagonism; Bentazon; Weed control; Sethoxydim; Fluazifop; Haloxyfop; Tank mix; Herbicide rates
Abstract/Contents:"Several new postemergence grass herbicides are currently being developed for weed control in soybeans. These herbicides have demonstrated excellent activity on many grass species. Farmers have demonstrated their acceptance of these herbicides by the widespread use of recently registered sethoxydim and fluazifop. Tank-mixing these grass herbicides with postemergence broadleaf herbicides for one-pass, total postemerence weed control is of interest to many producers. However, concerns with antagonism resulting in a loss of grass control have been expressed by many researchers. A review of research at the Ohio State University from 1979 to 1983 indicated that antagonism with bentazon could be demonstrated for 10 different postemergence grass herbicides. The level of antagonism depended on the herbicide, rate of application, and grass species that was present. Yield reduction did not always occur and the loss of grass control was not consistent. The research studies in 1984 were set up to evaluate the influence of herbicide rate on antagonism and to differentiate the level of antagonism for 8 different postemergence grass herbicides with bentazon. The studies were conducted at two locations in Ohio with giant foxtail being the predominant grass species. Herbicides were applied at .5x and x rates (x = labelled use rate) with and without bentazon (1 lb a.i./A) and always with 1% crop oil concentrate. Applications were made at the 1 to 3 trifoliate leaf stage when giant ragweed was 2 to 4 inches tall. Grass herbicides used were sethoxydim, fluazifop, haloxyfop, HOE 581, DPX 6202, PP 005, and SC 1084. Generally, both rates, when applied alone, provided excellent giant foxtail control. However, when tank-mixed with bentazon, antagonism could be demonstrated for all materials, with the lower rates showing the most antagonism. Bentazon tank-mixed with sethoxydim or RE 36290 showed the most antagonism, resulting in significant yield reduction. Haloxyfop, HOE 581, and SC 1084 were least affected by tank-mixing with bentazon. It is apparent from this research that antagonism can be overcome for any of these materials by increasing the herbicide rate. However, it may be more economical to a producer to make two separate applications and forego the convenience of the tank-mix."
Note:This item is an abstract only!
Author affiliation listed as "Assistant Professor and Research Associate, Department of Agronomy, Ohio State University, Columbus, OH"
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Anonymous. 1984. Field evaluation of postemerence grass herbicide antagonism with bentazon. Res. Rep. North Cent. Weed Control Conf. 39:p. 36.
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MSU catalog number: SB 610 .N6
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