Interorder transfer of mycoplasmalike microorganisms between Drosophila paulistorum and Ephestia kühniella. II. Numbers of MLO and sterility.

A successful attempt was made to culture the mycoplasmalike microorganism causing semispecific hybrid male sterility in Drosophila paulistorum utilizing Ephestia kühniella as the intermediate host. Data gleaned from this passage indicates that the induction of sterility depends upon the quality not the quantity of infectious intracellular symbionts.