Translator Disclaimer
1 November 2002 Critical period for weed control: the concept and data analysis
Author Affiliations +

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.

Nomenclature: Glyphosate; corn, Zea mays L.; soybean, Glycine max (L.) Merr.

Stevan Z. Knezevic, Sean P. Evans, Erin E. Blankenship, Rene C. Van Acker, and John L. Lindquist "Critical period for weed control: the concept and data analysis," Weed Science 50(6), 773-786, (1 November 2002).[0773:CPFWCT]2.0.CO;2
Received: 28 August 2001; Accepted: 8 May 2002; Published: 1 November 2002

Get copyright permission
Back to Top