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1 January 2016 Effect of Biennial Wormwood (Artemisia biennis) Interference on Sunflower Yield and Seed Quality
Derek W. Lewis, Andrea Cavalieri, Robert H. Gulden
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Biennial wormwood has been increasing in Manitoba, Canada, but information is limited on the potential of biennial wormwood to reduce crop yields. Field experiments were conducted over 5 site-yr throughout southern Manitoba in 2010 and 2011 to determine the effect of biennial wormwood density and relative time of biennial wormwood seedling recruitment on sunflower growth, development, yield, and seed quality. Biennial wormwood was broadcast on the soil surface at six densities into sunflowers planted in 75-cm rows, either at the same time the sunflower crop was planted (early weed seedling recruitment) or when the sunflowers were at about the four-leaf stage (late weed seedling recruitment). When biennial wormwood emerged at about the same time as the sunflowers, yield was reduced by up to 46%. Early-recruiting biennial wormwood had minimal effect on sunflower growth and development, but sunflower achene size and individual achene weight were reduced, even when no effect on sunflower yield was observed. Biennial wormwood plants that recruited after the four-leaf stage of the sunflower crop had no effect on sunflower yield or seed quality.

Nomenclature: Biennial wormwood, Artemisia biennis Willd., ARTBI; sunflower, Helianthus annuus L.

© 2016 Weed Science Society of America
Derek W. Lewis, Andrea Cavalieri, and Robert H. Gulden "Effect of Biennial Wormwood (Artemisia biennis) Interference on Sunflower Yield and Seed Quality," Weed Science 64(1), 154-160, (1 January 2016).
Received: 15 May 2015; Accepted: 1 August 2015; Published: 1 January 2016
Crop–weed interference
plant competition
rectangular hyperbola
yield loss
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