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In Chile and Uruguay,the gregarious Pteromalidae (Monoksa dorsiplana) hasbeen discovered emerging from seeds of the persistent pods of Acacia cavenattacked by the univoltin bruchid Pseudopachymeria spinipes. We investigatedthe potential for mass rearing of this gregarious ectoparasitoid on analternative bruchid host, Callosobruchus maculatus, to use it against thebruchidae of native and cultured species of Leguminosea seeds in South America.The mass rearing of M.dorsiplana was carried out in a population cage where thedensity of egg-laying females per infested seed was increased from 1:1 on thefirst day to 5:1 on the last (fifth) day. Under these experimental conditionsegg-clutch size per host increased, and at the same time the mortality of eggslaid also increased. The density of egg-laying females influenced the sex ratiowhich tended towards a balance of sons and daughters,in contrast to the sexratio of a single egg-laying female per host (1 son to 7 daughters). The meanweight of adults emerging from a parasitized host was negatively correlatedwith the egg-clutch size, i.e., as egg-clutch size increased, adult weightdecreased. All these results show that mass rearing of the gregariousectoparasitoid M.dorsiplana was possible under laboratory conditions on analternative bruchid host C.maculatus. As M.dorsiplana is a natural enemy oflarval and pupal stages of bruchidae, the next step was to investigate whetherthe biological control of bruchid C.maculatus was possible in an experimentalstructure of stored beans.

The potential of mass rearing of Monoksa dorsiplana (Pteromalidae) a  native gregarious ectoparasitoid of Pseudopachymeria spinipes (Bruchidae)in  South America