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Uptake, Translocation, and Metabolism of Picloram and Metsulfuron Methyl by Two Locoweed Species

Published online by Cambridge University Press:  12 June 2017

Tracy M. Sterling  and
Heidi S. Jochem
Tracy M. Sterling
Affiliation:
Dep. Entomol., Plant Pathol. and Weed Sci., New Mexico State Univ., Las Cruces, NM 88003
Heidi S. Jochem
Affiliation:
Dep. Entomol., Plant Pathol. and Weed Sci., New Mexico State Univ., Las Cruces, NM 88003
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Abstract

The locoweeds, woolly loco and silky crazyweed, contribute to livestock poisoning in the western United States. Differences in response of these two locoweeds to foliar-applied picloram and metsulfuron was investigated by evaluating differences in herbicide uptake, translocation, and metabolism. Silky crazyweed compared to woolly loco was more than 10 times as sensitive to increasing rates of either herbicide. The two species absorbed 8 to 15%, and 11 to 17% of applied picloram and metsulfuron, respectively. Translocation of picloram and metsulfuron out of treated leaflets of either species was less than 3% of that absorbed after 96 h. Approximately 70 and 100% of the absorbed herbicides remained as picloram and metsulfuron, respectively, in both species. Therefore, differences in picloram or metsulfuron uptake, translocation, and metabolism appear inadequate to account for the differential response to each herbicide by the two locoweed species. Selectivity differences between these locoweed genera to picloram and metsulfuron most likely are due to sensitivity differences at sites of action.

Keywords

Metsulfuron, 2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]sulfonyl]benzoic acidpicloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acidsilky crazyweed, Oxytropis sericea Nutt. ex T. & G. #3 OXRMAwoolly loco, Astragalus mollissimus Torn # ASAMLRangeland weed controlherbicide absorptionOXRMAASAML
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 43 , Issue 1 , March 1995 , pp. 13 - 17
Copyright
Copyright © 1995 by the Weed Science Society of America 

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References

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