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Velvetleaf (Abutilon theophrasti) Competition and Economic Thresholds in Conventional- and No-Tillage Corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

John Cardina ,
Emilie Regnier  and
Denise Sparrow
John Cardina
Affiliation:
Dep. Agron., Ohio Agric. Res. and Dev. Ctr, Ohio State Univ., Wooster, OH 44691
Emilie Regnier
Affiliation:
Dep. Agron., Ohio Agric. Res. and Dev. Ctr, Ohio State Univ., Wooster, OH 44691
Denise Sparrow
Affiliation:
Dep. Agron., Ohio Agric. Res. and Dev. Ctr, Ohio State Univ., Wooster, OH 44691
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Abstract

Studies were conducted in conventional and no-tillage corn in 1990, 1991, and 1992 at Wooster, OH, to measure corn yield and velvetleaf seed production in response to density of early and late emerging velvetleaf, and to estimate economic thresholds. The percent reduction in corn yield fit a hyperbolic function over velvetleaf densities from 1 to 30 plants m2. The percent yield loss and velvetleaf seed production were higher in a warm, wet year (1990) than in a dry (1991) or cold, wet year (1992). The percent corn yield reduction was generally greater in no-tillage than in conventional tillage and from early rather than late emerging velvetleaf. Maximum velvetleaf seed production ranged from about 18,000 seeds m2 for early emerging weeds in no-tillage in 1990 to 100 seeds m2 for late emerging weeds in no-tillage in 1992. The single year economic threshold for early emerging velvetleaf ranged from 0.40 to 14.0 velvetleaf m2 in conventional tillage and 0.13 to 3.13 in no-tillage. Economic thresholds that were predicted using yield goal information deviated from actual thresholds (using actual yields) for a given year by −43 to 30%. Single year economic thresholds were similar in both tillage treatments, but their value for management decisions is questionable due to variation among growing seasons and weed seed production from subthreshold populations.

Keywords

velvetleaf, Abutilon theophrasti Medicus. #3 ABUTHcorn, Zea mays L. ‘DK453.’Economic thresholdcompetitionseed rainABUTH
Type
Weed Biology and Ecology
Information
Weed Science , Volume 43 , Issue 1 , March 1995 , pp. 81 - 87
Copyright
Copyright © 1995 by the Weed Science Society of America 

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References

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