Sunday, December 9, 2007 - 8:41 AM

Movement of the tephritid fruit fly parasitoid Fopius arisanus (Hymenoptera: Braconidae) in a papaya orchard

Avi Eitam,, Kealoha M. Kinney,, and Roger I. Vargas, USDA-ARS, 64 Nowelo St, Hilo, HI

We conducted four point releases of mass-reared Fopius arisanus (Hymenoptera: Braconidae) in a papaya orchard at Kalapana, Hawaii Island. We monitored the released parasitoids at eight directions and five distances (15, 30, 60, 120 and 240 meters) from the release site using two METHODS: yellow sticky spheres and “sentinel” fruits containing oriental fruit fly eggs. Strong movement was detected up to 30-60 meters, although some was also observed at 120 and 240 meters. Movement was strongly affected by wind speed and direction, while a tendency for movement towards the east-southeast was also apparent. Spatial patterns of parasitism levels in sentinel fruits were similar to the patterns of capture on sticky spheres only in two of the four releases. This suggests that capture on sticky spheres in not always a good indicator of the movement of foraging females. Results will assist the design of augmentative parasitoid releases for the suppression of tephritid fruit flies.

Species 1: Hymenoptera Braconidae Fopius arisanus
Species 2: Diptera Tephritidae Bactrocera dorsalis (oriental fruit fly)