First report of the Eucalyptus gall wasp, Ophelimus maskelli (Hymenoptera: Eulophidae), an invasive pest on Eucalyptus, from the Western Hemisphere.
O. maskelli, a uniparental leaf-gall inducing invasive pest of several Eucalyptus species of the Exsertaria, Latoangulata, and Maidenaria sections, was found in southern California, USA, on 17 March 2014, in Riverside County, University of California Riverside Campus (UCR), and has been common there since then. It has also been found in other locations in southern California, including San Diego County (San Diego Safari Park on 1 November 2014), and Orange County (Laguna Niguel Regional Park). Specimens collected from UCR were compared with voucher specimens of O. maskelli collected from Lazio, Italy, and were found to be conspecific. This is thought to be the first report of O. maskelli from the Western Hemisphere.