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The Critical Period of Weed Control for Lentil in Western Canada

Published online by Cambridge University Press:  20 January 2017

L. K. Fedoruk ,
E. N. Johnson  and
S. J. Shirtliffe
L. K. Fedoruk
Affiliation:
BASF Canada, 1-411 Downey Rd., Saskatoon, SK S7N 4L8, Canada
E. N. Johnson
Affiliation:
Agriculture and Agri-Food Canada, Scott Research Farm, P.O. Box 10, Scott, SK S0K 4A0, Canada
S. J. Shirtliffe*
Affiliation:
Department of Plant Science, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK S7N 5A8, Canada
*
Corresponding author's E-mail: steve.shirtliffe@usask.ca
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Abstract

Weed control in lentil is difficult because lentil is a poor competitor with weeds and few POST broadleaf herbicides are available. Imadazolinone-tolerant lentils have more herbicide options, but the optimum timing for herbicide application is not known. The critical period of weed control (CPWC) is the period in a crop's life cycle when weeds must be controlled in order to prevent yield loss. The objective of this research was to determine the CPWC for lentil. We made lentil remain weedy or weed-free from 0 to 11 aboveground nodes to investigate the durations of weed interference and weed-free period, respectively. It was found that lentil has a CPWC beginning at the five-node stage and continuing to the 10-node stage. There was an inverse relationship between weed biomass and lentil yield; that is, lentil yield was highest when weed biomass is minimal. We propose that the CPWC begins when weeds start to accumulate significant biomass and ends with crop canopy closure. Therefore, to maximize lentil yields, growers should consider using a POST residual herbicide that can control weeds during the CPWC.

Keywords

Lentil, Lens culinaris L. ‘CDC Impact’Competitioncritical weed-free periodduration of interferencecritical timing of weed removalimidazolinone tolerantherbicide tolerant
Type
Weed Biology and Ecology
Information
Weed Science , Volume 59 , Issue 4 , December 2011 , pp. 517 - 526
Copyright
Copyright © Weed Science Society of America 

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