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Response of Two Annual Bluegrass Varieties to Preemergence and Postemergence Rimsulfuron

Published online by Cambridge University Press:  20 January 2017

Glenn Wehtje  and
Robert H. Walker
Glenn Wehtje
Affiliation:
Department of Agronomy and Soils, Auburn University, Auburn, AL 36849
Robert H. Walker
Affiliation:
Department of Agronomy and Soils, Auburn University, Auburn, AL 36849
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Abstract

In greenhouse studies, flowering annual bluegrass Poa annua L. var. annua (winter annual) and P. annua L. var. reptans (short-lived perennial) were treated postemergence with rimsulfuron at 54 g ai/ha in such a manner as to permit herbicide interception only by the foliage, interception only by the soil, and interception by both foliage and soil, as would occur in a typical application. The foliar-only, soil-only, and soil + foliar applications provided 57, 73, and 84% control, respectively, as averaged over all other experimental variables. Greater efficacy of the soil-only and soil + foliar applications indicated the importance of root absorption for annual bluegrass control with rimsulfuron. Adjuvant addition was beneficial to postemergence activity only at 18 g/ha, which is below the registered rate. Adjuvant-based control improvement at this rate was inconsistent and generally independent of the adjuvant type. Adding Renex-30 to 18 g/ha of rimsulfuron did increase control on an average from 16 to 51%. Postemergence efficacy was also independent of the annual bluegrass variety and growth media (field soil vs. a sand–peat mixture). Preemergence activity of rimsulfuron against germinating annual bluegrass seeds was slightly greater in the sand–peat mixture than in the soil and with var. annua than with var. reptans, and on uncovered seed compared with 0.5-cm-deep growth media covered seeds.

Keywords

Rimsulfuronannual bluegrass, Poa annua #3 POANNAdjuvant studyherbicide absorption by plantsherbicide placementsurfactant studyturfgrass weedsWATweeks after treatment
Type
Research
Information
Weed Technology , Volume 16 , Issue 3 , September 2002 , pp. 612 - 616
Copyright
Copyright © Weed Science Society of America 

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