Wiliwili & Erythrina Gall Wasp Monitoring Project
Innoculative releases of a biological control agent (Eurytoma erythrinae) were initiated by the Hawai‘i Department of Agriculture (HDOA) in November 2008, to suppress populations of the Erythrina gall wasp, a destructive pest on native wiliwili trees (Erythrina sandwicensis). Releases were completed on all of the main Hawaiian Islands, with the exception of Ni‘ihau and Kaho‘olawe. Pre-release biological monitoring data were collected from a total of 16 monitoring sites on Kaua‘i, O‘ahu, Maui and Hawai‘i Island. DLNR-DOFAW is currently working with HDOA, UH Manoa and US Forest Service researchers to continue monitoring the long-term effects this predator is having on the pest populations and ultimately on wiliwili recovery. Results to date are exceedingly positive, indicating a significant reduction in pest populations, and the recovery of wiliwili trees statewide.
- University of Hawai‘i at Manoa