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Simulated insect defoliation and duration of weed interference affected soybean growth

Published online by Cambridge University Press:  20 January 2017

Travis C. Gustafson ,
Stevan Z. Knezevic ,
Thomas E. Hunt  and
John L. Lindquist
Travis C. Gustafson
Affiliation:
Department of Plant Pathology, University of Nebraska, Lincoln, NE 68583
Thomas E. Hunt
Affiliation:
Haskell Agricultural Laboratory, University of Nebraska, 57905 866 Road, Concord, NE 68728-2828
John L. Lindquist
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583
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Abstract

An improved understanding of crop stress from multiple pests is needed for better implementation of integrated pest management (IPM) strategies. Field studies were conducted in 2003 and 2004 at two locations in eastern Nebraska to describe the effects of simulated early-season insect defoliation of soybean and duration of weed interference on soybean growth. Three levels of simulated defoliation (undefoliated, 30, and 60%) and seven durations of weed interference (weedy and weed free; weed removal at V2, V4, V6, R3, and R5) were evaluated in a split-plot design. Defoliation significantly reduced soybean leaf-area index (LAI), total dry matter (TDM), and crop height in season-long weedy treatments only. Biomass partitioning during vegetative and reproductive growth was affected by both defoliation and weed interference. Increase in soybean relative growth rate (RGR) and biomass production soon after defoliation occurred (e.g., V5 stage) indicated potential defense mechanism by which soybean is able to adjust its physiology in response to the loss of leaf area. Weed interference combined with defoliation caused the greatest yield losses up to 97%. Results from this study indicate the need for monitoring early-season insect density and weed growth to determine if simultaneous control of both pests may be needed.

Keywords

Soybean, Glycine max (L.) MerrCritical time for weed removalintegrated pest managementgrowth analysismultiple pestspest complex
Type
Research Article
Information
Weed Science , Volume 54 , Issue 4 , August 2006 , pp. 735 - 742
Copyright
Copyright © Weed Science Society of America 

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