News from the USDA Agricultural Research Service
A black, two-millimeter-long wasp from East Africa is helping wage war on one of its own kind—the Erythrina gall wasp, an invasive species that’s decimated Hawaii’s endemic wiliwili (Erythrina sandwicensis) and introduced coral bean trees (Erythrina spp.).
Hawaii Department of Agriculture (HDOA) officials “recruited” the beneficial wasp, Eurytoma erythrinae, and first released it in November 2008 after evaluating its host specificity as a biocontrol agent. U.S. Department of Agriculture (USDA) entomologist Michael Gates’ scientific description and naming of the species, together with a collaborator, helped HDOA obtain the necessary federal approvals to make the release.
How the gall wasp arrived in Hawaii in April 2005 is unknown, but it quickly found suitable hosts on which to feed and reproduce, first on Oahu and then other Hawaiian islands