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Environment Affects Cotton and Velvetleaf Response to Pyrithiobac

Published online by Cambridge University Press:  12 June 2017

M. Angela Harrison ,
Robert M. Hayes  and
Thomas C. Mueller
M. Angela Harrison
Affiliation:
Dep. Plant and Soil Sci., Univ. Tennessee, Knoxville, TN
Robert M. Hayes
Affiliation:
Dep. Plant and Soil Sci., Univ. Tennessee, Knoxville, TN
Thomas C. Mueller*
Affiliation:
Dep. Plant and Soil Sci., Univ. Tennessee, Knoxville, TN
*
Address correspondence to: Tom Mueller, Dep. Plant and Soil Sci., P. O. Box 1071, Knoxville. TN 37901.
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Abstract

Growth chamber experiments evaluated the influence of ambient temperature and soil moisture on cotton and velvetleaf response to pyrithiobac. Additional studies determined the basis for observed plant responses to 14C pyrithiobac. Cotton injury from six times the normal dosage was < 20% at 2 wk for all temperatures and soil moistures. Pyrithiobac injured velvetleaf less at lower soil moistures. Both species absorbed more 14C-pyrithiobac at 30/28 or 35/33 C than at 25/23 C. Cotton absorbed more herbicide than velvetleaf at all temperatures and soil moistures. Velvetleaf translocated < 16% of absorbed 14C out of the treated leaf while cotton translocated < 3% of absorbed material. At warmer temperatures, velvetleaf translocated less 14C when soil was dry (–1.0 MPa) than when plants were watered to field capacity (–0.03 MPa). This decreased absorption and translocation may affect pyrithiobac activity on velvetleaf growing in dry soil. Translocation differences did not fully explain whole plant effects. The metabolism difference may account for cotton tolerance.

Keywords

Pyrithiobac, sodium 2-chloro-6-(4,5-dimethoxy-pyrimidin-2-ylthio)-benzoatevelvetleaf, Abutilon theophrasti Medic♯ ABUTHcotton, Gossypium hirsutum L ‘Deltapine 50.’AbsorptiontranslocationmetabolismDPX-PE350
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 44 , Issue 2 , June 1996 , pp. 241 - 247
Copyright
Copyright © 1996 by the Weed Science Society of America 

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