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Agrichemical Interactions with Propanil on Propanil-Resistant Barnyardgrass (Echinochloa crus-galli)

Published online by Cambridge University Press:  12 June 2017

Jason K. Norsworthy*
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville. AR 72704
Jeffery S. Rutledge
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville. AR 72704
Ronald E. Talbert
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville. AR 72704
Robert E. Hoagland
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service. Southern Weed Science Research Unit, Stoneville, MS 38776
*
Corresponding author's E-mail: [email protected].

Abstract

Agrichemical interactions between propanil; the herbicides HOE 30374, pendimethalin, piperophos, quinclorac, and thiobencarb; and the insecticide carbaryl were evaluated under field conditions to find synergistic or additive interactions useful to control a barnyardgrass biotype resistant to propanil (R-BYG) without injuring rice. Propanil and each compound were evaluated at four rates for a total of 16 rate combinations for each additive. Averaged over all experiments, 2- to 3-leaf R-BYG control with propanil alone at 0.83, 1.65, 3.3, and 6.6 kg ai/ha was 33, 53, 62, and 81% at 7 d after treatment (DAT). Propanil-susceptible barnyardgrass (S-BYG) response to propanil alone at similar rates was 52, 73, 88, and 94% control. HOE 30374, carbaryl, piperophos, or pendimethalin in combination with propanil produced synergistic effects on R-BYG. For each compound tested, at least one rate combination with propanil controlled R-BYG > 80% with minimal rice injury (< 20%) at 7 DAT. Use of these combinations of compounds could provide more effective control of this resistant biotype and help prevent its spread.

Type
Research
Copyright
Copyright © 1999 by the Weed Science Society of America 

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Footnotes

1

Published with the approval of the Director, Arkansas Agricultural Experiment Station.

References

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