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Picloram Uptake, Translocation, and Efficacy in Relation to Water Status of Russian Knapweed (Acroptilon repens)

Published online by Cambridge University Press:  12 June 2017

Robert G. Morrison ,
Norman K. Lownds  and
Tracy M. Sterling
Robert G. Morrison
Affiliation:
Dep. Agron. and Hortic., New Mexico State Univ.; Dep. Entomol., Plant Pathol. and Weed Sci., New Mexico State Univ., Las Cruces, NM 88003
Norman K. Lownds
Affiliation:
Dep. Agron. and Hortic., New Mexico State Univ.; Dep. Entomol., Plant Pathol. and Weed Sci., New Mexico State Univ., Las Cruces, NM 88003
Tracy M. Sterling
Affiliation:
Dep. Agron. and Hortic., New Mexico State Univ.; Dep. Entomol., Plant Pathol. and Weed Sci., New Mexico State Univ., Las Cruces, NM 88003
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Abstract

Picloram uptake, translocation, and efficacy were studied using greenhouse-grown Russian knapweed plants. Uptake of 14C-picloram, applied as discrete droplets to adaxial leaf surfaces of well-watered plants, averaged less than 10% of that applied. Most uptake occurred within 30 min of application. Uptake increased linearly with external picloram concentrations from 6.2 to 74.5 mM and was proportional to picloram concentration. Only about 10% of absorbed picloram was translocated out of the treated leaf of well-watered plants within 96 h, with approximately equal acropetal and basipetal translocation. Water stress before, at the time of, and after picloram application did not affect picloram uptake, but reduced total translocation and increased the relative amount translocated basipetally. Water stress also reduced picloram efficacy. Although Silwett L-77 increased picloram uptake into Russian knapweed leaves, it did not increase efficacy under water stress conditions.

Keywords

Picloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acidRussian knapweed, Acroptilon repens L. #3 CENRERangeland weed controlherbicide uptakeherbicide absorptionherbicide translocationdrought stressCENRE
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 43 , Issue 1 , March 1995 , pp. 34 - 39
Copyright
Copyright © 1995 by the Weed Science Society of America 

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