A Case Study of Analysis Related to Spread and Glyphosate Resistance of Palmer Populations in Arkansas

• Activity Number: 249
• Type: Contributed
• Date/Time: Monday, August 4, 2014 : 2:00 PM to 3:50 PM
• Sponsor: Section on Statistical Consulting
• Author(s): Andy Mauromoustakos*+ and Nilda Roma Burgos
• Companies: University of Arkansas and University of Arkansas
• Keywords: GLIMMIX ; spatial ; JMP

Abstract

This research presents a consulting case study involved the statistical analysis of weed science data. Thirty-eight fields, cotton and soybean, infested with Palmer amaranth were sampled in the fall of 2008 and 2009. Up to 20 individual female plants were sampled per field. The offsprings of each plant were tested for resistance to glyphosate. All fields had glyphosate-resistant individuals. Populations from fields representing each crop production zone in Arkansas were selected to determine resistance levels to glyphosate, the impact of selection pressure on the glyphosate target gene, and study the population genetics of resistant populations to understand the impact of intensive glyphosate use on the evolution of resistant (R) Palmer amaranth populations. Generalized linear mixed models and spatial statistics were used to answer the questions of interest related to the offspring plant survival and the geographical locations of where the parents were found and sampled.