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Postemergence Small Broomrape (Orobanche minor) Control in Red Clover

Published online by Cambridge University Press:  20 January 2017

Ryan D. Lins ,
Jed B. Colquhoun ,
Charles M. Cole  and
Carol A. Mallory-Smith
Ryan D. Lins*
Affiliation:
Oregon State University, 107 Crop Science Building, Corvallis, OR 97331
Jed B. Colquhoun
Affiliation:
Oregon State University, 107 Crop Science Building, Corvallis, OR 97331
Charles M. Cole
Affiliation:
Oregon State University, 107 Crop Science Building, Corvallis, OR 97331
Carol A. Mallory-Smith
Affiliation:
Oregon State University, 107 Crop Science Building, Corvallis, OR 97331
*
Corresponding author's E-mail: ryan.lins@oregonstate.edu
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Abstract

Small broomrape is an annual, parasitic weed that was discovered recently in Oregon's red clover seed production system. Field experiments were conducted in 2002 and 2003 at two locations to evaluate 10 herbicide treatments applied after small broomrape emergence in red clover. Bentazon, bromoxynil, glyphosate, imazamox, imazamox plus bentazon, imazethapyr, MCPA, and pendimethalin were evaluated. Small broomrape density, small broomrape seed viability after treatment, and clover injury and seed yield were quantified. Small broomrape control with imazamox, glyphosate, and imazamox plus bentazon treatments was greater than the nontreated check in both years. However, imazamox and imazamox plus bentazon treatments were the only herbicide treatments that consistently exhibited a high level of crop safety, reduced small broomrape density, and did not reduce red clover yield. Herbicide treatments did not prevent production of viable small broomrape seeds. Future research is needed to develop control options that will prevent red clover yield loss and viable small broomrape seed production when applied before small broomrape emergence.

Keywords

BentazonbromoxynilglyphosateimazamoximazethapyrMCPApendimethalinsmall broomrape, Orobanche minor Sm. # ORAMIred clover, Trifolium pratense L. # TRFREParasitic weedDATdays after treatment
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 2 , June 2005 , pp. 411 - 415
Copyright
Copyright © Weed Science Society of America 

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