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Foliar and Root Absorption and Translocation of Bispyribac-sodium in Cool-season Turfgrass

Published online by Cambridge University Press:  20 January 2017

Darren W. Lycan  and
Stephen E. Hart
Darren W. Lycan
Affiliation:
Plant Biology and Pathology Dept., Rutgers, The State University of New Jersey, New Brunswick, NJ 08901
Stephen E. Hart*
Affiliation:
Plant Biology and Pathology Dept., Rutgers, The State University of New Jersey, New Brunswick, NJ 08901
*
Corresponding author's E-mail: [email protected].
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Abstract

Response of creeping bentgrass, annual bluegrass, and Kentucky bluegrass to foliar, soil, or foliar plus soil applications of bispyribac-sodium was evaluated in greenhouse studies. Soil-alone and foliar plus soil applications of bispyribac-sodium at 148 or 296 g ai/ha resulted in greater injury and shoot dry weight reduction of all species 28 d after treatment (DAT) compared to foliar-alone treatments. Creeping bentgrass was less injured than annual or Kentucky bluegrass regardless of application placement. Further studies evaluated foliar and root absorption and translocation of 14C-bispyribac-sodium in creeping bentgrass, annual bluegrass, Kentucky bluegrass, and roughtstalk bluegrass. Foliar absorption into creeping bentgrass was less than that of other species at most harvest timings from 4 to 72 h after treatment. Annual and roughstalk bluegrass translocated greater amounts of foliar-absorbed 14C to the crown and shoots compared to creeping bentgrass. Annual and roughstalk bluegrass accumulated approximately 47% more 14C per dry weight of plant tissue than creeping bentgrass and 74% more than Kentucky bluegrass after 72 h in nutrient solution containing 14C-bispyribac-sodium. Annual and roughstalk bluegrass translocated approximately 80% of root-absorbed 14C to shoots, whereas creeping bentgrass and Kentucky bluegrass translocated slightly less (66% of absorbed for both species). These studies suggest that bispyribac-sodium is readily absorbed by roots and translocated to shoots which may contribute to its total activity within a plant. In addition, creeping bentgrass displayed lower amounts of foliar and root absorption and subsequent translocation than annual and roughstalk bluegrass which may contribute to greater bispyribac-sodium tolerance displayed by creeping bentgrass.

Keywords

Bispyribac-sodiumannual bluegrass, Poa annua L. #3 POAANcreeping bentgrass, Agrostis stolonifera L. ‘L-93’ #AGSSTroughstalk bluegrass, Poa trivialis L. ‘Winterplay’ #POATRKentucky bluegrass, Poa pratensis L. ‘Baron’ #POAPRHerbicide placementsite of uptakeALS, acetolactate synthase (EC 2.2.1.6)HAT, hours after treatmentLSS, liquid scintillation spectroscopyWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 20 , Issue 4 , December 2006 , pp. 1015 - 1022
Copyright
Copyright © Weed Science Society of America 

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