The cotton fleahopper, Pseudatomoscelis seriatus (Reuter) is a serious early season pest of cotton in South Texas. The current economic threshold of 15-25% infestation during the first 3 weeks of squaring is not well defined. Data from studies in 1984 and 1985 on Tamcot SP-37H cotton in the Coastal Bend indicated significant earliness of automatically treated plots (beginning at 5-6 true leaves) over check plots in 1984 and 1985, and over intermediate infestations in 1984. No differences between treatments in final yield or quality were observed in either year.