SEASONALITY IN OCCURRENCE AND DISTRIBUTION OF MEDITERRANEAN FRUIT-FLY (DIPTERA, TEPHRITIDAE) IN UPLAND AND LOWLAND AREAS ON KAUAI, HAWAII

Mediterranean fruit fly, Ceratitis captitata (Wiedemann), was monitored with male lure trap collections and periodic collections of ripe fruits on the island of Kauai to determine its temporal appearance and distribution patterns. Results showed marked temporal differences in peak trap catches of the fly in lowland areas compared with upland areas. Flies were caught in two upland locations compared with catches in six lowland locations. Strawberry guava, Psidium cattleianum Sabine, and common guava, Psidium guajava L., form a discontinuous belt of plants around Kauai. Infestation of this fruit by C. capitata was nearly absent in wet areas and consistent but variable in dry areas. The seasonal appearance of C. capitata in traps in Kokee and Polihale coincided with their emergence from collected fruits. The mean infestation rate of C. capitata in guava was 0.43 +/- 0.27 (mean +/- SEM) per kg of fruit compared with 37.5 +/- 15.3 for Bactrocera dorsalis (Hendel). Infestation of all fruits collected by B. dorsalis was widespread in all areas when these plants produced ripe fruits. Utilization of all fruits by C. capitata was very limited in comparison with the distribution and abundance of host plants.