The insecticides, Steward 1.25 SC (indoxicarb), Centric 40 WG (thiamethoxam), Actara 25WG (thiamethoxam), Calypso 480 SC (thiacloprid) and Leverage 2.7 EC (imidacloprid + cyfluthrin) were evaluated for control of tarnished plant bug (Lygus lineolaris (Palisot de Beauvois)) in a small plot field cage test in cotton. Laboratory reared nymphs were held for 1 or 4 days in sleeve cages following insecticide application. Mortality at 1 day after treatment was variable between treatments with levels >85% in only the thiamethoxam sprayed plots. At 4 days after treatment, mortality was above 90% in all insecticide treatments except the low rate of Steward and for Calypso. The 4-day testing period appeared to be appropriate for control evaluations in sleeve cages.