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Effect of Seed Bank Augmentation on Herbicide Efficacy

Published online by Cambridge University Press:  20 January 2017

Kerry L. Taylor  and
Robert G. Hartzler
Kerry L. Taylor
Affiliation:
Department of Agronomy, Iowa State University, Ames, IA 50011
Robert G. Hartzler*
Affiliation:
Department of Agronomy, Iowa State University, Ames, IA 50011
*
Corresponding author's E-mail: [email protected].
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Abstract

Seeds of giant foxtail (Setaria faberi, 4,000 seeds/m2) or velvetleaf (Abutilon theophrasti, 3,000 seeds/m2) were added to the seed bank to determine the effect of increases in weed density on herbicide efficacy in corn (Zea mays). A herbicide program consisting of SAN 582 applied preemergence followed by a postemergence application of dicamba plus atrazine was evaluated at four levels (0.0, 0.3, 0.7 and 1.0 times the label rates). At a site with low initial weed densities, the addition of velvetleaf or giant foxtail seed to the seed bank did not influence herbicide efficacy at the 1.0× rate at 9 wk after planting (WAP). Giant foxtail densities were greater 9 WAP in augmented areas than in the native seed bank plots at both the 0.3× and 0.7× rates, whereas with velvetleaf, higher densities in augmented plots were seen only at the 0.3× rate. In areas with high native weed densities, addition of seed of either species resulted in an increase in final weed densities at all herbicide rates.

Keywords

Atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diaminedicamba, potassium salt of 3,6-dichloro-2-methoxybenzoic acidSAN 582 (proposed name, dimethenamid), 2-chloro-N-(2,4 dimethyl-3-thienyl)-N-(2-methoxy-1-methylethyl)acetamidegiant foxtail, Setaria faberi Herm. # SETFAvelvetleaf, Abutilon theophrasti Medic. # ABUTHcorn, Zea mays L.Weed seed bankABUTHSETFAPOST, postemergencePRE, preemergenceWAP, weeks after planting
Type
Research Article
Information
Weed Technology , Volume 14 , Issue 2 , June 2000 , pp. 261 - 267
Copyright
Copyright © Weed Science Society of America 

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