Abstract
Myoporum spp. (Lamiales: Scrophulariaceae) native to Australia and New Zealand have been introduced into North America and have been widely planted as shrubs and ground covers in the California urban landscape. The invasive thrips, Klambothrips myopori Mound and Morris, invaded California in 2005 and feed exclusively on Myoporum. However, some commercial cultivars have suffered extensive damage, whereas others have not. In field studies and laboratory feeding tests of six different potential host species or cultivars, Myoporum laetum and Myoporum 'Pacificum' were identified as most suitable host plants of K. myopori. In laboratory trials, K. myopori failed to complete development on M. 'Clean n Green' and M. 'Putah Creek'. Of the six varieties of Myoporum tested, K. myopori damage was only observed on M. laetum and M. 'Pacificum'. Although K. myopori can successfully colonize and reproduce on several varieties of Myoporum, they demonstrated a preference for M. laetum and M. 'Pacificum' in laboratory and field trials.
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