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Biology and BehaviorDetailed biologies of this parasitoid have been published, beginning with the careful studies of Pemberton and Willard (1918a, 1918b). More recently, Ramadan et al. (1989) and Wong et al. (1990) examined such features as realized fecundity and the influence of cohort age and host age on offspring sex ratio as a prelude to work on developing a mass rearing program for inundative releases using this species (Wong et al. 1991, Wong et al. 1992). Hurtrel et al. described the development time and temperature thresholds for Diachasmimorpha tryoni (Cameron) in Ceratitis capitata (Hurtrel et al. 2001). They found that D. tryoni can develop within the temperature range of 15°C to 28°C, with development times of 63.60 and 16.52 days respectively. At the lower end of the temperature range they found the sex ratio to be heavily male-biased.