Abstract
West Indian marsh grass, Hymenachne amplexicaulis Rudge (Nees) (Poaceae), is an emergent wetland plant that is native to South and Central America as well as portions of the Caribbean, but is considered invasive in Florida USA. The neotropical bug, Ischnodemus variegatus (Signoret) (Hemiptera: Lygaeoidea: Blissidae) was observed feeding on H. amplexicaulis in Florida in 2000. To assess whether this insect could be considered as a specialist biological control agent or potential threat to native and cultivated grasses, the host specificity of I. variegatus was studied under laboratory and field conditions. Developmental host range was examined on 57 plant species across seven plant families. Complete development was obtained on H. amplexicaulis (23.4% survivorship), Paspalum repens (0.4%), Panicum anceps (2.2%) and Thalia geniculata (0.3%). Adults survived 1.6 times longer and laid 6.6 times more eggs on H. amplexicaulis than the other species. Oviposition on suboptimal host species was positively related to I. variegatus density under multiple choice conditions. Results from field experiments indicated that H. amplexicaulis had higher densities of I. variegatus than other species. Spill-over to suboptimal hosts occurred in an area where H. amplexicaulis was growing in poor conditions and there was a high density of I. variegatus. Thus, laboratory and field studies demonstrate that I. variegatus had higher performance on H. amplexicaulis compared to any other host, and that suboptimal hosts could be colonized temporarily.
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Acknowledgements
We express our gratitude to Dennis Giardina and Mike Barry, Florida Panther Preserve, for collection and identification of grasses. Diana Cordeau, Jackie Markle, Brittany Evans, Yordana Valenzuela, Brianne Schobert, Freddy Soza, Douglas Gonzalez, Veronica Manrique, Fabian Diaz and Larry Markle provided great support during the data collection. Paul Benshoff and Diane Donaghy from Myakka River State Park provided support during the development of this project. Several grasses were identified by Mark A. Garland at FDACS, DPI-Gainesville. Two anonymous reviewers provided useful comments. The University of Florida-Institute of Food and Agricultural Sciences, Florida Department of Environmental Protection and the Charlotte Harbor National Estuary Program provided financial support for the project.
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Handling Editor: John Scott.
An erratum to this article can be found at http://dx.doi.org/10.1007/s10526-008-9192-7
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Diaz, R., Overholt, W.A., Cuda, J.P. et al. Host specificity of Ischnodemus variegatus, an herbivore of West Indian marsh grass (Hymenachne amplexicaulis). BioControl 54, 307–321 (2009). https://doi.org/10.1007/s10526-008-9188-3
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DOI: https://doi.org/10.1007/s10526-008-9188-3
Keywords
- Blissidae
- Hemiptera
- Herbivore performance
- Host quality
- Poaceae