DIVERSITY AND ABUNDANCE OF ORIENTAL FRUIT-FLY PARASITOIDS (HYMENOPTERA, BRACONIDAE) IN GUAVA ORCHARDS IN KAUAI, HAWAII

Abundance of oriental fruit fly, Dacus dorsalis Hendel, and associated parasitoids was determined in a commercial guava, Psidium guajava L., orchard by canopy fogging and fruit collections during 1988 and 1989. D. dorsalis populations reached a maximum of 2.6 adults per tree in 1988 and 1.4 adults per tree in 1989. Four parasitoid species were recovered from guava tree canopies; Biosteres arisanus (Sonan) was the most abundant species, followed by Diachasmimorpha longicaudata (Ashmead), Psyttalia incisi (Silvestri), and Biosteres vandenboschi (Fullaway), respectively. D. dorsalis and parasitoids recovered from guava canopies exhibited different sex ratios from populations that emerged from fruit samples. Abundance of D. dorsalis and its parasitoids was correlated with the number of ripe fruit present in the orchard. Parasitoid abundance was correlated with D. dorsalis abundance in 1988. Diversity and abundance of parasitoids estimated from canopy fogging and fruit collections differed.