Flowers of the subtropical fruit crop Annona cherimola, exhibit marked protogyny and have a mechanism for avoiding self-pollination. They therefore require hand-pollination without proper pollinators which do not exist outside its native regions. In Japan, sap-feeding nocturnal coleopteran beetles visit and stay in the flowers, so they one candidates of the pollinators. This study aims to investigate fragrance effects of the cherimoya flowers on flower-visiting behavior of such beetles. First of all, we monitored fragrance emission patterns in three Annona spp. Although the patterns differed among them, the quality of all their fragrances increased both in the dusk and dawn. It appears to synchronize to the activity of the nocturnal beetles. Furthermore, GC/MS analysis of those fragrances revealed that the major components are n-aliphatic ethyl ester and aliphatic alcohols despite the sexual phases. The Annona floral fragrances resembled to general fruit fragrances that the sap-feeding beetles prefered. We therefore consider that the Annona flowers would attract such sap-feeding beetles by the fruit-like floral fragrances. Although this hypothesis was tested both in the field and laboratory, the results were not positive. Further improvement of bioassay systems are required to confirm the effects on the beetles.