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Early-season insect defoliation influences the critical time for weed removal in soybean

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 Agronomy and Horticulture, 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

To develop more effective pest-management strategies, it is essential to understand how different pests interact with each other and the crop. Field studies were conducted in 2003 and 2004 at two Nebraska locations to determine the effects of early-season crop defoliation on the critical time for weed removal (CTWR) in narrow-row soybean. Three soybean defoliation levels were selected to simulate 0, 30, and 60% leaf tissue removal by the bean leaf beetle. Weeds were allowed to compete with the crop until V2, V4, V6, R3, and R5 growth stages. There were also season-long weedy and weed-free treatments. Results indicated that the CTWR in soybean occurred earlier as defoliation levels increased from 0 to 60%. The CTWR occurred at V3, V2, and V1 growth stage for 0, 30, and 60% defoliation levels, respectively. Overall, 60% defoliation resulted in earlier CTWR by at least 14 d. Yield losses from defoliation and weed interference were primarily associated with a reduction in number of pods per plant−1.

Keywords

Soybean, Glycine max L. MerrCritical time for weed removalintegrated pest managementmultiple pestspest complexsimulated insect defoliation
Type
Weed Management
Information
Weed Science , Volume 54 , Issue 3 , June 2006 , pp. 509 - 515
Copyright
Copyright © Weed Science Society of America 

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