Development of Campoletis sonorensis and Microplitis croceipes males (black bars) and females (open bars) developing in singly and multiparasitised L2 larvae of Heliothis virescens. Individual hosts were singly parasitised by C. sonorensis (left panel, first two bars) or M. croceipes (right panel, first two bars) or subsequently multiparasitised by the other species (last two bars in a panel) at various time intervals (0, 6, 24, or 48 h) following the initial parasitism event. Data were combined for the different time intervals. (A) Mean egg-to-adult development time (days) and (B) mean adult fresh body mass (mg). Line bars represent standard errors of the mean with the sample size between brackets. Bars with different letters are significantly different (Tukey-Kramer test: P<0.05). Data were analysed separately for the two competition experiments as indicated by small and capital letters.