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Assessing the specificity of a herbivore on a plant of uncertain phylogenetic placing: Listronotus elongatus a herbivore of Hydrocotyle ranunculoides


Hydrocotyle ranunculoides (Araliaceae) is an aquatic plant native to the Americas and invasive in Europe. This work reports laboratory and garden studies on the host range of its main natural enemy, the weevil Listronotus elongatus (Hustache) (Coleoptera: Curculionidae). The genus Hydrocotyle is in a disputed phylogenetic situation such that both Apiaceae and Araliaceae must be included in the test list, but lacking a clear criterion of phylogenetic proximity. For this reason three testing instances were applied: no-choice on excised leaves, no choice on functional plants, and a multiple choice garden experiment. A large initial test-plant list was reduced to a smaller list adjusted by a feeding intensity criterion, survival curves and oviposition levels. Feeding was observed on the excised leaves of 21 out of 36 test plants, but as tests progressed to whole plants L. elongatus showed it could only develop and thrive on its natural host, and possibly survive as adults on Hydrocotyle modesta. Results confirm that typical laboratory starvation tests can provide a dependable ranking of physiological acceptability of different plant species but severely overestimate the actual host range of a specialized herbivore. They also indicate that the phylogenetic criterion for test plant list construction must be approached cautiously if the phylogeny is uncertain or disputed.

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We wish to thank Juan José Valla and Pablo Pica for several of the plant identifications, three anonymous referees and two editors of the journal for many, many important pieces of advice, and Octavio Bruzzone for statistical help. CABI-Europe financed most of the studies through a Cooperative Agreement of April 2012. Collecting permits to initiate the laboratory colonies were obtained from the DGRN of the Production Ministry of the Province of Entre Ríos, Argentina.

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Correspondence to G. Cabrera Walsh.

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Handling Editor: S. Raghu.

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Cabrera Walsh, G., Maestro, M. Assessing the specificity of a herbivore on a plant of uncertain phylogenetic placing: Listronotus elongatus a herbivore of Hydrocotyle ranunculoides . BioControl 62, 269–279 (2017).

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  • Floating pennywort
  • Listronotus elongatus
  • Centrifugal phylogenetic method
  • Specificity tests
  • Hydrocotyle ranunculoides