The pteromalid parasitoid Pteromalus cerealellae is an ectoparasitoid of several stored-product insects. We compared the longevity, egg load, and progeny production in starved (no water, no sugar), water-fed only, and sugar-fed (25% sucrose solution plus water) adults of P. cerealellae. Egg loads of females of different physiological states were quantified by dissection. The effects of mating and host availability on longevity and progeny production were also investigated using the cowpea weevil Callosobruchus maculatus as host. While sucrose-fed males lived significantly longer than did starved or water-fed males, sugar feeding resulted only in a marginal increase in longevity of female wasps. Mated individuals lived longer than non-mated wasps and host availability had a positive effect on longevity. Individual female P. cerealellae emerged with very few mature eggs and sugar feeding did not appear to have any significant effects on progeny production. The results are discussed in relation to the biology of the parasitoid and its utilization for biological control of stored-product pests.