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Interactions of Fenoxaprop-ethyl with Fenchlorazole-ethyl in Annual Grasses

Published online by Cambridge University Press:  12 June 2017

Gerald R. Stephenson ,
Abraham Tal ,
Norman A. Vincent  and
J. Christopher Hall
Gerald R. Stephenson
Affiliation:
Dep. Environ. Biol., Univ. Guelph, Guelph, Ontario, Canada, N1G 2W1
Abraham Tal
Affiliation:
Dep. Environ. Biol., Univ. Guelph, Guelph, Ontario, Canada, N1G 2W1
Norman A. Vincent
Affiliation:
Dep. Environ. Biol., Univ. Guelph, Guelph, Ontario, Canada, N1G 2W1
J. Christopher Hall
Affiliation:
Dep. Environ. Biol., Univ. Guelph, Guelph, Ontario, Canada, N1G 2W1
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Abstract

In growth room studies, POST applications of fenoxaprop-ethyl at 50 g ai ha−1 at the four- to five-leaf stage of development were non-toxic to barnyardgrass, large crabgrass, and yellow foxtail. POST applications of fenchlorazole-ethyl at 12.5 or 25.0 g ai ha−1 were also nontoxic to these same three species. However, when the two chemicals were applied in combination at the above rates they were toxic to all three species, indicating a synergistic interaction in all three species. In additional studies, a sensitive biotype of wild oat was severely injured by fenoxaprop-ethyl at 50 g ai ha−1 and a resistant biotype of wild oat was only slightly injured by fenoxaprop-ethyl at rates as high as 800 g ai ha−1. However, no significant interactions were observed between fenoxaprop-ethyl and fenchlorazole-ethyl in either of these wild oat biotypes.

Keywords

Fenchlorazole-ethyl [ethyl-1-(2,4-dichlorophenyl)-5-trichloro-methyl- 1H-1,2,4-triazole-3-carboxylate]fenoxaprop-ethyl {ethyl-(±)2-[4-[(6-chloro-2-benzoxazolyl)oxy]propanoic acid}barnyardgrass [Echinochloa crus-galli (L.) Beauv. # ECHCG]large crabgrass [Digitaria sanguinalis (L.) Scop. # DIGSA]yellow foxtail [Setaria glauca (L.) Beauv. # SETLU]wild oat (Avena fatua L. # AVEFA)Antagonismsynergismbarleybarnyardgrasslarge crabgrassyellow foxtailoatwild oatwheatSETLUDIGSAECHCGAVEFA
Type
Research
Information
Weed Technology , Volume 7 , Issue 1 , March 1993 , pp. 163 - 168
Copyright
Copyright © 1993 by the Weed Science Society of America 

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References

Literature Cited

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