DIAPAUSE AVERSION IN THE ADULT OLIVE FRUIT-FLY THROUGH EFFECTS OF THEHOST FRUIT, BACTERIA, AND ADULT DIET

Adult diapause of Bactrocera oleae (Gmelin) lasted for 28 days when th e preimaginal stages developed at a photoperiod of 12:12 (L:D) h and 1 9 +/- 1-degrees-C and the adults were maintained at 16:8 (L:D) h and 2 6 +/- 1-degrees-C and fed on a sucrose diet. This reproductive immatur ity was averted in most flies when the adult females had access to oli ve fruits, surface sterilized or not, or were fed a diet containing ye ast hydrolyzate. Immaturity was also averted in part of the population when a bacterial culture from the fly's esophageal diverticulum was a dded to the sucrose diet. Immaturity persisted in the presence of oliv e leaves, in the presence of olive fruits when streptomycin was added to the adult sucrose diet, and when bacteria isolated from olive fruit s were added to the sucrose diet.