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Temperature Influences Creeping Bentgrass (Agrostis stolonifera) and Annual Bluegrass (Poa annua) Response to Bispyribac-Sodium

Published online by Cambridge University Press:  20 January 2017

Patrick E. McCullough  and
Stephen E. Hart
Patrick E. McCullough*
Affiliation:
Department of Plant Biology and Pathology, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901-8520
Stephen E. Hart
Affiliation:
Department of Plant Biology and Pathology, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901-8520
*
Corresponding author's E-mail: [email protected]
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Abstract

Bispyribac-sodium is a POST herbicide that selectively controls annual bluegrass in creeping bentgrass, but inconsistent results with seasonal applications are believed to occur from temperature influences on bispyribac-sodium efficacy. Growth chamber experiments at the New Jersey Experimental Greenhouse Research Complex, New Brunswick, NJ, investigated three temperature regimes on ‘L-93’ creeping bentgrass and annual bluegrass responses to bispyribac-sodium. Annual bluegrass and creeping bentgrass exhibited contrasting responses to bispyribac-sodium as temperature increased from 10 to 30 C. Regressions of 4 week after treatment (WAT) data revealed as temperature increased from 10 to 30 C, required bispyribac-sodium rates for 50% clipping reduction (CR50) of annual bluegrass decreased from 85 to 31 g ai/ha and required rates for 50% leaf chlorosis decreased from greater than 296 to 98, indicating increased herbicidal efficacy at higher temperatures. In contrast, required bispyribac-sodium rates for creeping bentgrass CR50 increased from 200 to greater than 296 as temperature increased from 10 to 30 C. Bispyribac-sodium discolored creeping bentgrass 0 to 20% at 20 and 30 C and discoloration increased 10 to 50% at 10 C. Thus, warmer temperatures (20 and 30 C) increase bispyribac-sodium efficacy for annual bluegrass control with minimal bentgrass discoloration; however, cooler temperatures (10 C) have minimal efficacy on annual bluegrass and increase bentgrass chlorosis.

Keywords

Bispyribac-sodiumannual bluegrass Poa annua L. #3 POANNcreeping bentgrass, Agrostis stolonifera L. # AGSST, ‘L-93’Chlorosisefficacyturfgrass
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 3 , September 2006 , pp. 728 - 732
Copyright
Copyright © Weed Science Society of America 

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