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Critical period for weed control: the concept and data analysis

Published online by Cambridge University Press:  20 January 2017

Stevan Z. Knezevic ,
Sean P. Evans ,
Erin E. Blankenship ,
Rene C. Van Acker  and
John L. Lindquist
Sean P. Evans
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583-0915
Erin E. Blankenship
Affiliation:
Department of Biometry, University of Nebraska, Lincoln, NE 68583-0712
Rene C. Van Acker
Affiliation:
Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, Canada R3T2N2
John L. Lindquist
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583-0817
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Abstract

The critical period for weed control (CPWC) is a period in the crop growth cycle during which weeds must be controlled to prevent yield losses. Knowing the CPWC is useful in making decisions on the need for and timing of weed control and in achieving efficient herbicide use from both biological and economic perspectives. An increase in the use of herbicide-tolerant crops, especially soybean resistant to glyphosate, has stimulated interest in the concept of CPWC. Recently, several studies examined this concept in glyphosate-resistant corn and soybean across the midwestern United States. However, these studies presented various methods for data analysis and reported CPWC on the basis of a variety of crop- or weed-related parameters. The objectives of this study are (1) to provide a review of the concept and studies of the CPWC, (2) to suggest a common method to standardize the process of data analysis, and (3) to invite additional discussions for further debate on the subject. Wide adoption of the suggested method of data analysis will allow easier comparison of the results among sites and between researchers.

Keywords

Glyphosatecorn, Zea mays L.soybean, Glycine max (L.) MerrCrop–weed interactionsduration of interferencecritical timing of weed removalcritical weed-free periodnonlinear regressionexperimental design
Type
Research Article
Information
Weed Science , Volume 50 , Issue 6 , December 2002 , pp. 773 - 786
Copyright
Copyright © Weed Science Society of America 

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