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The Critical Period of Weed Control in Lentil (Lens culinaris) in the Pacific Northwest

Published online by Cambridge University Press:  20 January 2017

Jamin A. Smitchger ,
Ian C. Burke  and
Joseph P. Yenish
Jamin A. Smitchger
Affiliation:
Department of Crop and Soil Sciences, Johnson Hall 201, Washington State University, Pullman, WA 99164
Ian C. Burke*
Affiliation:
Department of Crop and Soil Sciences, Johnson Hall 201, Washington State University, Pullman, WA 99164
Joseph P. Yenish
Affiliation:
Department of Crop and Soil Sciences, Johnson Hall 201, Washington State University, Pullman, WA 99164
*
Corresponding author's E-mail: icburke@wsu.edu
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Abstract

The critical period of weed control (CPWC) for ‘Pardina’ and ‘Brewer’ lentil was determined in field experiments near Pullman, WA, in 2008 and 2009. Trial treatments were kept either weed free for periods of 0, 14, 25, 35, 45, 60, 75, or ∼90 d after emergence (DAE), or weeds were allowed to grow before removal for periods of 0, 14, 25, 35, 45, 60, 75, or ∼90 DAE. Averaged across varieties, lentil with season-long weed interference had 29.5 and 32% seed yield reduction compared to weed-free lentils in 2008 and 2009, respectively. When measured at crop maturity, a 1% loss in lentil seed yield resulted from each 5.68 g m−2 of dry weed biomass. Based on a 5% yield loss threshold, the CPWC for lentil was estimated to be from 270 to 999 growing degree days (GDD), 22 to 57 DAE, or crop growth stage (CGS) 7 to the early pod stage during 2008. In 2009, the CPWC was 624 to 650 GDD, with no occurrence of a CPWC when estimated using DAE and CGS. Spiny sowthistle emerged and competed with the lentil crop later in the growing season than mayweed chamomile, indicating that mayweed chamomile may be an earlier and stronger competitor than spiny sowthistle.

Keywords

Mayweed chamomile, Anthemis cotula Lprickly lettuce, Lactuca serriola Lspiny sowthistle, Sonchus asper (L.) Hilllentil, Lens culinaris Medik. ‘Pardina’and ‘Brewer’Critical period of weed removalcritical time of weed removalcritical weed free periodweed competitionweed interference
Type
Weed Biology and Ecology
Information
Weed Science , Volume 60 , Issue 1 , March 2012 , pp. 81 - 85
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: Field Scientist, Dow AgroSciences, 1001 Calendula Circle, Billings, MT 59105.

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