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Effect of Ethalfluralin and Other Herbicides on Trifluralin-Resistant Green Foxtail (Setaria viridis)

Published online by Cambridge University Press:  12 June 2017

Hugh J. Beckie  and
Ian N. Morrison
Hugh J. Beckie
Affiliation:
Dep. Plant Sci., Univ. Manitoba, Winnipeg, MB, Canada, R3T 2N2
Ian N. Morrison
Affiliation:
Dep. Plant Sci., Univ. Manitoba, Winnipeg, MB, Canada, R3T 2N2
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Abstract

The response of trifluralin-susceptible (S) and -resistant (R) green foxtail biotypes to herbicides belonging to several chemical groups was compared to determine the cross-resistance pattern of the R-biotype. Dose-response experiments conducted in the growth chamber indicated that R-green foxtail was resistant to other dinitroanilines and a chemically unrelated mitotic disrupter herbicide, but not to nine other herbicides belonging to seven chemical families. The response of S- and R-green foxtail to increasing dosages of ethalfluralin, applied PPI in rapeseed, was investigated in a field experiment in 1989 and 1990. The R-biotype was 7 times more resistant to ethalfluralin than the S-biotype based on density determinations 4 wk after emergence. Seven times higher dosage was required to reduce R-seed production by 50% than to reduce S-seed production by the same amount. The initial reductions in density of R- and S-plants at the recommended dosage of ethalfluralin in rapeseed (1.4 kg ha−1) was 35% and 95%, respectively. The effective kill (seed yield reduction) of R- and S-biotypes was 55% and 99%, respectively. The results indicate that ethalfluralin will not effectively control R-green foxtail. However, several other herbicides with different mechanisms of action can be used to effectively control R-foxtail, thereby reducing any adverse effects of their interference on crop production.

Keywords

Ethalfluralin, N-ethyl-N-(2-methyl-2-propenyl)-2,6-dinitro-4-(trifluoromethyl)benzenaminetrifluralin, 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenaminegreen foxtail, Setaria viridis (L.) Beauv. # SETVIrapeseed, Brassica napus L. ‘Westar’Herbicide resistancecross-resistanceBrassica napusTriticum aestivumSETVI
Type
Feature
Information
Weed Technology , Volume 7 , Issue 1 , March 1993 , pp. 6 - 14
Copyright
Copyright © 1993 by the Weed Science Society of America 

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