Journal of Entomological Science (2002) 37, 244-253

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Lori J. Kroiss, Karen L. Broz, Cindy B.S. Tong and W.D. Hutchison (2002)
Tomatillo resistance to Colorado potato beetle (Coleoptera: Chrysomelidae)
Journal of Entomological Science 37 (3), 244-253
Abstract: Tomatillo (Physalis ixocarpa Brot ex Hornem) resistance to the Colorado potato beetle, Leptinotarsa decemlineata (Say), was evaluated in the laboratory. In vivo assays confirmed that L. decemlineata larvae fed tomatillo leaves had lower weights and survival than larvae fed potato leaves. Larvae fed potato leaves coated with alpha-tomatine also had lower weights and survival than controls. Larvae were also fed potato leaves coated with tomatillo leaf extracts. These larvae exhibited lower weights but equal survival compared with the controls. Removal of trichome exudates from tomatillo leaves did not affect the detrimental effects of the leaves on larvae. These results confirm the negative effects of tomatillo leaves and alpha-tomatine on L. decemlineata larval survival and weight. However, HPLC and mass spectrometry results show that alpha-tomatine was not present in the tomatillo leaf samples we studied. These results suggest that further research is warranted to isolate compounds for further plant resistance research within tomatillo.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): William (Bill) D. Hutchison

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Leptinotarsa decemlineata Physalis (crop)