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7 March 2017 Establishment of Parasitoids of the Lily Leaf Beetle (Coleoptera: Chrysomelidae) in North America
Lisa Tewksbury, Richard A. Casagrande, Naomi Cappuccino, Marc Kenis
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Three larval parasitoids were imported from Europe to control the lily leaf beetle, Lilioceris lilii Scopoli (Coleoptera: Chrysomelidae), an accidentally introduced herbivore of native and cultivated lilies in North America. Tetrastichus setifer Thomson (Hymenoptera: Eulophidae) was introduced in Massachusetts in 1999, and was found to be established there in 2002. Subsequent releases of T. setifer were made and two additional parasitoids, Lemophagus errabundus Szepligeti (Hymenoptera: Ichneumonidae) and Diaparsis jucunda (Holmgren) (Hymenoptera: Ichneumonidae), were introduced. The establishment and distribution of the three parasitoids was evaluated through 2016. Tetrastichus setifer is now established in Massachusetts, Rhode Island, New Hampshire, Maine, Connecticut, and Ontario, Canada. Lemophagus errabundus is established in Massachusetts and Rhode Island, and D. jucunda is established in Massachusetts, Rhode Island, Connecticut, and Maine. All three parasitoids have spread at least 10 km from release sites. The establishment of T. setifer is associated with a substantial reduction of L. lilii. In time it is likely that the parasitoids will spread throughout the North American range of L. lilii. This process can be accelerated to protect ornamental and native lilies by collecting and redistributing parasitoids to new infestations of L. lilii.

© The Authors 2017. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For Permissions, please email:
Lisa Tewksbury, Richard A. Casagrande, Naomi Cappuccino, and Marc Kenis "Establishment of Parasitoids of the Lily Leaf Beetle (Coleoptera: Chrysomelidae) in North America," Environmental Entomology 46(2), 226-236, (7 March 2017).
Received: 15 September 2016; Accepted: 30 January 2017; Published: 7 March 2017

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Diaparsis jucunda
Lemophagus errabundus
Lilioceris lilii
lily leaf beetle
Tetrastichus setifer
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