Acaricidal and cytotoxic activities of extracts from selected genera of Australian Lamiaceae

Publication Type:Journal Article
Year of Publication:2005
Authors:H. L. Rasikari, Leach, D. N., Waterman, P. G., Spooner-Hart, R. N., Basta, A. H., Banbury, L. K., Forster, P. I.
Journal:J Econ Entomol
Date Published:Jan
Keywords:2-Spotted Spider-Mite, Ajuga Plants, Cell-Lines, Clerodane Diterpenoids, Essential Oils, Glossocarya, Insect Cell Lines, Neoclerodane Insect Antifeedants, Plectranthus, Plectranthus-Barbatus, Predatory Mite, Scutellaria-Galericulata, Tetranychus Urticae, Tetranychus-Urticae Acari

Crude foliar extracts of 67 species from six subfamilies of Australian Lamiaceae were screened by whole organism contact toxicity on the polyphagous mite Tetranychus urticae Koch (Acari: Tetranychidae) by using a Potter precision spray tower. Cytotoxicity assessments against insect cell lines from Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) and Drosophila melanogaster (Meigen) (Diptera: Drosophilidae) also were made. The Spodoptera cell line was more susceptible to extracts than the Drosophila cell line. No direct correlation was observed between the two screening methods, but several interesting relationships were identified. Extracts from subfamilies Ajugoideae, Scutellarioideae, Chloanthoideae, Viticoideae and Nepetoideae showed acaricidal activity, whereas only those from Ajugoideae and Nepetoideae displayed potent cytotoxic effects. A range of activities was observed for the 25 species of Plectranthus, 14 of which showed moderate-to-high contact toxicity against T. urticae. Overall, the lowest toxicity was observed for extracts from the plant subfamily Prostantheroideae, which showed little contact toxicity or cytotoxicity for the 18 extracts studied.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith