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Grass Herbicide Efficacy as Influenced by Adjuvant, Spray Solution pH, and Ultraviolet Light

Published online by Cambridge University Press:  12 June 2017

Patrick M. McMullan
Patrick M. McMullan*
Affiliation:
Agric. and Agri-Food Canada Res Ctr., P.O. Box 1000A, RR #3, Brandon, MB, Canada, R7A 5Y3
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Abstract

Research was conducted at the Brandon Research Centre to determine the effect of spray solution pH or adjuvants on the efficacy of two cyclohexanedione (CHD) herbicides, clethodim and tralkoxydim, and two aryloxyphenoxypropionate (APP) herbicides, fenoxaprop-P and quizalofop, and if ultraviolet light is a factor influencing their activity. CHD herbicide efficacy decreased as spray solution pH increased above 7. APP herbicide efficacy was not affected by spray solution pH, probably due to their formulation as proherbicide esters. The choice of adjuvant affected CHD herbicide efficacy but not APP herbicide efficacy. Amigo®, Canplus-411® plus ammonium sulfate, and Merge® were usually the most effective adjuvants with the two CHD herbicides. Physical removal of ultraviolet light did not improve APP herbicide efficacy but did improve CHD herbicide efficacy.

Keywords

Clethodim, (E,E)-(±)-2-[1-[[(3-chloro-2-propenyl)oxy]imino]-propyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onefenoxaprop-P, (R)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoic acidquizalofop, (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidtralkoxydim, 2-[1-(ethoxyimino)propyl]-3-]hydroxy-5-(2,4,6-trimethylphenyl)cyclohex-2-enone, barley, Hordeum vulgare L. #3 HORVXoat, Avena sativa L. # AVESAClethodimfenoxaprop-PquizalofoptralkoxydimAvena sativaHordeum vulgareAVESAHORVX
Type
Research
Information
Weed Technology , Volume 10 , Issue 1 , March 1996 , pp. 72 - 77
Copyright
Copyright © 1996 by the Weed Science Society of America 

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References

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