In an experimental mass production system, sheets of 10 Parafilm^® encapsulated boll weevil (Anthonomus cirandis Boheman) larvae were exposed to colonies of 150-00 females of Catolaccus grandis (Burks) for different periods of time. Significant differences in the survival of parasitoids were observed between the exposure periods. The best exposure periods were between 5 to 7 hours. The doubling and tripling of host density significantly increased parasitoid survival. A total of 26,300 parasitoid females were produced in months, with a mean production of 3,300 females per week. Potential for improving rearing efficiency is discussed.