Differences in Glyphosate-Resistant Weed Management Practices over Time and Regions

Xia Vivian Zhou, Roland K. Roberts, James A. Larson, Dayton M. Lambert, Burton C. English, Ashok Mishra, Lawrence L. Falconer, Robert J. Hogan, Jason L. Johnson, Jeanne M. Reeves

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The objective of this research was to describe proportional differences across time and region in management practices among southern cotton farmers who experienced glyphosate-resistant (GR) weeds on their farms earlier than those who experienced them later and among farmers who were closest to one of four historical outbreak epicenters: Lauderdale County, TN; Macon County, GA; Edgecombe County, NC; and Terry County, TX. A mail survey was conducted with cotton farmers in 2012 from 13 southern, cotton-producing states. Survey responses on practices used by farmers were classified into three broad categories of labor, mechanical/tillage/chemical (MTC), and cultural. Proportions of respondents using practices from each category were identified by time and region; across which, proportional-difference tests were conducted. Results indicated respondents encountering GR weeds earlier were more likely than farmers who experienced them later to use the three broad-category practices (labor, 98 vs. 92%; MTC, 95 vs. 89%; and cultural, 86 vs. 76%) and specific practices, including hooded sprayers (76 vs. 58%), in-season herbicide change (83 vs. 60%), and field-border management (60 vs. 35%). Also, respondents closest to Lauderdale County were more likely than farmers closest to Edgecombe County to use broad-labor practices (99 vs. 91%) and specific practices, including hand hoeing (96 vs. 84%), hand spraying (49 vs. 31%), spot spraying (76 vs. 59%), wick applicator (13 vs. 11%), and field-border management (58 vs. 39%). Education programs on weed management can be developed and tailored according to the time and regional differences to provide effective information and communication channels to farmers.

Original languageEnglish (US)
Pages (from-to)1-12
Number of pages12
JournalWeed Technology
Issue number1
StatePublished - Mar 1 2016
Externally publishedYes


  • Glyphosate
  • management practices
  • weed resistance

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science


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