Biological Control for Management of Cane Tibouchina and Other Weedy Melastome Species in Hawaii

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Biological Control for Management of Cane Tibouchina and Other Weedy Melastome Species in Hawaii

248 Session 5 Prospects for Weed Biological Control in Pacific Islands Biological Control for Management of Cane Tibouchina and Other Weedy Melastome Species in Hawaii E. Raboin1, S. Souder2 and M. T. Johnson1 1USDA Forest Service, Pacific Southwest Research Station, Institute of Pacific Islands Forestry, Volcano, HI, USA [email protected] 2University of Hawaii at Hilo, Tropical Conservation Biology and Environmental Science, Hilo, HI, USA Abstract Syphraea uberabensis Bechyné (Coleoptera: Chrysomelidae) is a South American flea beetle whose adults and larvae feed externally on foliage and soft stems of Tibouchina spp., causing enough damage to kill small plants. Under quarantine evaluation as a potential biological control agent for cane tibouchina, Tibouchina herbacea (DC.) Cogn. (Melastomataceae), S. uberabensis has been tested on a variety of native and non-native species within the order Myrtales to identify its expected host range in Hawaii. Multi-choice behavioral tests with adult beetles and no-choice tests with adults and larvae indicated a host range restricted to several species within the tribe Melastomeae, all of which are invasive weeds in Hawaii. Preferences were found for feeding and egg laying on cane tibouchina, longleaf glorytree (Tibouchina longifolia (Vahl) Baill. ex Cogn.), false meadowbeauty (Pterolepis glomerata (Rottb.) Miq.) and Asian melastome (Melastoma septemnervium Lour.), and all four of these species were suitable hosts for the complete life cycle of S. uberabensis. Beetles appeared unlikely to impact other seriously invasive melastomes including princess flower (Tibouchina urvilleana (DC.) Cogn.), miconia (Miconia calvescens DC.) and Koster’s curse (Clidemia hirta (L.) D. Don). We consider the potential for using this biological control agent in management of multiple weedy melastomes. XIII International Symposium on Biological Control of Weeds - 2011.

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