Full TGIF Record # 8277
Item 1 of 1
Publication Type:
Author(s):Mueller, T. C.; Witt, W. W.; Barrett, M.; Slack, C. H.
Author Affiliation:University of Kentucky
Title:Antagonism of 2,4-D on activity of postemergent grass herbicides
Source:Kentucky Turfgrass Research. 1985, p. 30.
Publishing Information:Lexington, KY: University of Kentucky, College of Agriculture, Cooperative Extension Service
Keywords:TIC Keywords: 2,4-D; Diclofop; Sethoxydim; Fluazifop; Weed control; Herbicide combinations; Postemergence herbicides; Herbicides; Sorghum halepense; Antagonism; Fenoxaprop-ethyl; Herbicide rates
Abstract/Contents:Previous work indicated adding 2,4-D to diclofop reduced control of grass species. The objective of this study was to determine and compare the effects of adding 2,4-D to fenoxaprop, sethoxydim and fluazifop on johnsongrass. The experiment was conducted in the summer of 1985 at the University of Kentucky research farm at Lexington. Seedling johnsongrass was initiated in the greenhouse and transplanted into 40 x 50 cm plots. Each plot consisted of eight plants. Plants were mowed once and the regrowth allowed to attain a height of 90-100 cm at the time of herbicide application. Chemicals were applied at a carrier volume of 243 1/ha at 195 kPa and commercial formulations were used. The three postemergent grass herbicides were applied at five rates, ranging from 0.25X to 2.0X, where X is the normal field rate. The normal use rate was set for fenoxaprop at 0.18 kg/ha, sethoxydim at 0.24 kg/ha and flauzifop at 0.16 kg/ha. The dimethylamine salt of 2,4-D was applied alone and in combination with each grass herbicide at 0.0, 0.6, 1.2 and 2.4 kg/ha. Crop oil concentrate (1% v/v) was added to Sethoxydim and Flauzifop treatments. Fenoxaprop is formulated with a surfactant, therefore no adjuvent was used. Data collected included visual observations and dry weights four weeks after treatment. The efficacy of each postemergent grass herbicide was reduced by the addition of 2.4-D. Without addition of 2.4-D, flauzifop and fenoxaprop gave similar control of johnsongrass. Sethoxydim had less activity on the johnsongrass than the other two herbicides. Flauzifop activity was reduced 40% at all three phenoxy levels. Sethoxydim activity was reduced 30% by 0.6 kg/ha of 2,4-D, and 50% by 1.2 and 2.4 kg/ha of 2,4-D. Fenoxyprop activity was reduced 30% by 0.6 kg/ha of 2,4-D, 50% by 1.2 kg/ha of 2,4-D and 66% by 2.4 kg/ha of 2,4-D. For the three grass herbicides, increasing the herbicide rate partially offset the reduction in herbicide activity from 2.4-D but control equal to the grass herbicide without 2,4-D was not achieved.
Geographic Terms:Kentucky
See Also:Other items relating to: 2, 4 - D in Turf
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Mueller, T. C., W. W. Witt, M. Barrett, and C. H. Slack. 1985. Antagonism of 2,4-D on activity of postemergent grass herbicides. KY. Turfgrass Res. p. 30.
Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=8277
If there are problems with this record, send us feedback about record 8277.
Choices for finding the above item:
Find Item @ MSU
MSU catalog number: SB 433 .A1 K4
Request through your local library's inter-library loan service (bring or send a copy of this TGIF record)