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The Response of Yellow Starthistle (Centaurea solstitialis), Annual Grasses, and Smooth Brome (Bromus inermis) to Imazapic and Picloram

Published online by Cambridge University Press:  20 January 2017

Sandra L. Shinn  and
Donald C. Thill
Sandra L. Shinn*
Affiliation:
Syngenta Crop Protection, 67 Pinewood Road, Hudson, NY 12534
Donald C. Thill
Affiliation:
Department of Plant, Soil and Entomological Sciences, University of Idaho, Moscow, ID 83844-2339
*
Corresponding author's E-mail: sandra.shinn@syngenta.com.
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Abstract

Competition from annual grasses and yellow starthistle can severely reduce perennial grass forage production and quality in pasture and rangeland. The purpose of this study was to determine yellow starthistle and weedy annual grass control by imazapic applied alone or in combination with picloram, and smooth brome tolerance to these treatments. Sixty days after treatment (DAT) imazapic applied at 70 and 140 g ae/ha reduced annual grass (downy brome, medusahead, and annual bluegrass) plant density and biomass by 66 to 76% compared with the untreated control. Picloram applied at 280 and 420 g ae/ha reduced yellow starthistle plant density and biomass by over 93%. Imazapic applied at 70 and 140 g/ha reduced smooth brome biomass by 79 to 95% at 60 DAT. Picloram did not affect the density or the biomass of annual grasses or smooth brome, whereas imazapic did not markedly affect the density or the biomass of yellow starthistle. Downy brome control increased to a maximum of 97% with increasing imazapic dose (maximum of 280 g/ha) at 30, 60, and 90 DAT.

Keywords

Ammonium salt of imazapicpotassium salt of picloramannual bluegrass, Poa annua L. #3 POAANdowny brome, Bromus tectorum L. # BROTEmedusahead, Taeniatherum caput-medusae (L.) Nevski. # ELYCMsmooth brome, Bromus inermis Leyss. # BROINyellow starthistle, Centaurea solstitialis L. # CENSOHerbicide toleranceDAT, days after treatmentOM, organic matterPOST, postemergence
Type
Research
Information
Weed Technology , Volume 16 , Issue 2 , June 2002 , pp. 366 - 370
Copyright
Copyright © Weed Science Society of America 

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