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Phytotoxicity, Absorption, and Translocation of Five Clopyralid Formulations in Honey Mesquite (Prosopis glandulosa)

Published online by Cambridge University Press:  12 June 2017

Rodney W. Bovey ,
Hugo Hein Jr.  and
F. Nelson Keeney
Rodney W. Bovey
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Pest Management Res. Unit, Southern Crops Res. Lab. in cooperation with Dep. Range Sci., Texas A&M Univ., College Station, TX 77841
Hugo Hein Jr.
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Pest Management Res. Unit, Southern Crops Res. Lab. in cooperation with Dep. Range Sci., Texas A&M Univ., College Station, TX 77841
F. Nelson Keeney
Affiliation:
Dow Chemical U.S.A., Midland, MI 48640
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Abstract

Foliar sprays of the monoethanolamine salt, potassium salt, free acid, and 1-decyl ester of clopyralid were more effective in killing greenhouse-grown honey mesquite than the 2-ethylhexyl ester at rates of 0.28 ae/ha or less. More clopyralid was transported to the lower canopy from application of the monoethanolamine salt and potassium salt than the 2-ethylhexyl ester of clopyralid at 4 h or 1, 3, or 8 days after treatment. Application of the monoethanolamine salt and the 2-ethylhexyl ester to leaves with a pipet indicated that about twice as much clopyralid was absorbed within 15 min from the ester form (26%) than from the amine form (12%) of the total recovered. However, after 24 h, absorption of the ester was less than the amine. More than twice as much clopyralid was transported from the treated leaf after application of amine than the ester. Only the acid form of clopyralid was transported away from the site of application of either ester or amine.

Keywords

Clopyralid, 3,6 - dichloro - 2 - pyridinecarboxylic acidhoney mesquite, Prosopis glandulosa Torr. # PRCJGMonoethanolamine saltpotassium saltfree acid1 - decyl ester2 - ethylhexyl esterPRCJG
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 37 , Issue 1 , January 1989 , pp. 19 - 22
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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