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Wild Oat (Avena fatua) vs. Redstem Filaree (Erodium cicutarium) Interference in Dry Pea

Published online by Cambridge University Press:  20 January 2017

K. Neil Harker ,
Robert E. Blackshaw  and
George W. Clayton
K. Neil Harker*
Affiliation:
Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C & E Trail, Lacombe, AB, Canada, T4L 1W1
Robert E. Blackshaw
Affiliation:
Agriculture and Agri-Food Canada, Lethbridge Research Centre, Box 3000, Lethbridge, AB, Canada, T1J4B1
George W. Clayton
Affiliation:
Sustainable Production Systems, Agriculture and Agri-Food Canada, Lethbridge Research Centre, Box 3000, Lethbridge, AB, Canada, T1J 4B1
*
Corresponding author's E-mail: harkerk@agr.gc.ca
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Abstract

Dry peas (pea) usually require early and effective weed management for optimum yields. However, it is not always possible to control all weeds with a single herbicide application. In experiments at Lacombe and Lethbridge, Alberta, Canada, we determined the relative importance of controlling redstem filaree or wild oat, or both species. Bentazon, sethoxydim, or a imazethapyr/imazamox mixture was applied to control redstem filaree, wild oat, or both weeds, respectively. None of the herbicides caused visually detectable crop injury. Time of weed removal effects on pea yield were inconsistent. In addition, applying half or full herbicide rates did not usually influence weed biomass, pea yield, or pea seed weight. Averaged across all variables except herbicide, pea yield losses due to competition from redstem filaree, wild oat, or both species averaged 31, 47, or 53%, respectively. When redstem filaree and wild oat were controlled with imazethapyr/imazamox, pea yields were the same as weed-free check plots in three of four location-years (89% of weed-free yields for all four location-years). Optimal pea yields in weed communities with redstem filaree and wild oat as dominant species were more dependent upon selecting an herbicide that controlled both species than a specific time of weed removal or herbicide rate.

Keywords

bentazonimazamoximazethapyrsethoxydimredstem filaree, Erodium cicutarium (L.) L'Her. Ex Aitwild oat, Avena fatua L.dry pea, Pisum sativum L.Competitioncritical periodreduced ratestime of weed removal
Type
Research
Information
Weed Technology , Volume 21 , Issue 1 , March 2007 , pp. 235 - 240
Copyright
Copyright © Weed Science Society of America 

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