Research studies conducted by H. M. Adair on orthene in 1971 produced good efficacy on the cotton fleahopper Psallus seriatus, and tarnished plant bug Lygus lineolaris at rates from 0.25 to 0.5 lb. ai/a. These insects have the potential to reduce yield if present in sufficient numbers by feeding on small squares causing the squares to abort. Most of the activity associated with the fleahopper and plant bug on cotton takes place during early squaring, and continues through the heavy squaring period of cotton development. Research trials were conducted at the Northeast station, St. Joe, LA in 1981, and the Red River station, Bossier City, LA in 1983, comparing yields of chlordimeform treated cotton with yields from Orthene treated cotton. Results indicated that Orthene yields were comparable to chlordimeform yields. Six applications of Orthene at 0.25 lb.ai/a, applied at weekly intervals from early squaring, produced yields significantly higher than controls in the 1981 test. Similar results were achieved with four applications of Orthene at 0.33 lb.ai/a in the 1983 test. Orthene efficacy on the fleahopper/plant bug complex suggest that when economically damaging populations of these pest exist, control can be maintained with Orthene. The result is minimizing square loss to these insects, which has the potential of increasing yield over an uncontrolled environment.