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Translocation of Different 2,4-D, Bentazon, Diclofop, or Diclofop-Methyl Combinations in Oat (Avena sativa) and Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Chris Hall ,
Lloyd V. Edgington  and
Clayton M. Switzer
Chris Hall
Affiliation:
Dep. Environ. Biol., Univ. of Guelph, Guelph, Ontario, Canada N1G 2W1
Lloyd V. Edgington
Affiliation:
Dep. Environ. Biol., Univ. of Guelph, Guelph, Ontario, Canada N1G 2W1
Clayton M. Switzer
Affiliation:
Dep. Environ. Biol., Univ. of Guelph, Guelph, Ontario, Canada N1G 2W1
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Abstract

Oat (Avena sativa L. ‘Elgin′) and soybean (Glycine max L. ‘Evans′) were treated with 14C-diclofop-methyl {methyl ester of 2-[4-(2,4-dichlorophenoxy)phenoxy] propionic acid]} or 14C-diclofop alone or in combination with 2,4-D [(2,4-dichlorophenoxy)acetic acid] or bentazon [3-isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide] and 14C-2,4-D alone or in combination with diclofop-methyl or diclofop. More radioactivity was recovered in the treatment zone after 14C-diclofop-methyl applications, alone or in combination, than after similar 14C-diclofop treatments in oat and soybean. Basipetal movement of radioactivity was 4 and 1% and acropetal movement was 1 and 4% in oat and soybean, respectively, regardless of the diphenyl ether treatment or time. Addition of 2,4-D or bentazon did not reduce translocation of radioactivity from 14C-diclofop-methyl treatments in either plant species. Basipetal movement of radioactivity from 14C-diclofop-methyl was greater than from 14C-diclofop in both oat and soybean. The addition of diclofop-methyl or diclofop did not affect the pattern or amount of 14C-2,4-D radioactivity translocated. In oats, radioactivity appeared to accumulate within the intercalary meristematic region with 14C-2,4-D and 14C-diphenyl-ether applications. Diclofop-methyl at 1 kg/ha applied either to an entire oat plant at the three-leaf stage or the apical meristemic region resulted in plant mortality. The extent to which transport contributes to diclofop-methyl efficacy is questioned.

Keywords

Antagonismapical meristemdirected spraydiphenyl ether
Type
Research Article
Information
Weed Science , Volume 30 , Issue 6 , November 1982 , pp. 676 - 682
Copyright
Copyright © 1982 by the Weed Science Society of America 

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