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Effects of Weed Density and Defoliated or Undefoliated Soybeans (Glycine max) on Velvetleaf (Abutilon theophrasti) Development

Published online by Cambridge University Press:  12 June 2017

Randall A. Higgins ,
David W. Staniforth  and
Larry P. Pedigo
Randall A. Higgins
Affiliation:
Study conducted at Iowa State Univ. Dep. of Entomol., Iowa State Univ., Ames, IA 50011
David W. Staniforth
Affiliation:
Study conducted at Iowa State Univ. Plant Path., Seed, and Weed Sci., Iowa State Univ., Ames, IA 50011
Larry P. Pedigo
Affiliation:
Study conducted at Iowa State Univ. Dep. of Entomol., Iowa State Univ., Ames, IA 50011
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Abstract

Velvetleaf (Abutilon theophrasti Medic. ♯3 ABUTH) grown under monoculture consistently exceeded velvetleaf intercropped with soybeans [Glycine max (L.) Merr. var. ‘Amsoy 71′] in leaf area, nodes with fully developed leaves, canopy width, branches, and number of capsules as early as 3, 3, 4, 5, and 8 weeks, respectively, after simultaneous emergence. Velvetleaf plants without soybean competition eventually developed over nine times the dry matter of velvetleaf intercropped with soybean. The only components of velvetleaf plants sampled which sometimes increased significantly when soybean was defoliated in a manner simulating damage caused by the green cloverworm (GCW) (Plathypena scabra F.) were leaf area, number of leaves, and number of main-stem nodes. Soybeans in Iowa are attacked by the GCW late enough in the growing season that velvetleaf surviving previous weed management efforts benefited only slightly.

Keywords

Plathypena scabracompetitionpest interactionintegrated pest managementgrowth analysis
Type
Weed Biology and Ecology
Information
Weed Science , Volume 32 , Issue 4 , July 1984 , pp. 511 - 519
Copyright
Copyright © 1984 by the Weed Science Society of America 

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