A field study was conducted at Munday, Texas, in 2004 and 2005 to evaluate the effects of irrigation and tillage systems on cotton fleahopper (Pseudatomoscelis seriatus Reuter) seasonal activity in cotton. The experiment was deployed in a randomized complete block design with three replications and six treatments. The six treatments included 40-inch spacing subsurface drip, 80-inch spacing subsurface drip, and standard furrow irrigation in conservation and conventional tillage systems. Cotton fleahoppers were monitored using a backpack vacuum sampler for 30 seconds in each plot for six weeks from mid July to late August in 2004 and from late June to early August in 2005. Fleahopper abundance in conservation tillage was significantly lower compared with that in conventional tillage plots in both years. There were no significant differences in cotton fleahopper abundance among the different irrigation systems in 2004 or 2005; however, there were significant differences among sampling dates in both years. For 2004 the highest numbers of cotton fleahoppers were found on 20 July, 5 weeks after planting and on 2 August, 7 weeks after planting in 2005.