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The potential of botanical extracts such as  Celosia argenea  L. (Caryophyllales: Amaranthaceae),  Ricinus communis  L. (Malpighiales: Euphorbiaceae),  Mikania micrantha  Humboldt, Bonpland & Kunth (Astrales: Asteraceae), and  Catharanthus roseus  (L.) G. Don (Gentianales: Apocynaceae) for the control of  Brontispa longissima  Gestro was evaluated in a bioassay and semi—field trial. Dose—response bioassay showed no significant difference in oral—toxicity among the extracts of  C. argenea, M. micrantha,  and  C. roseus  to larvae and adult of  B. longissima.  All extracts tested decreased the hatchability of  B. longissima  eggs. In particular, the extract of  M. micrantha  showed higher activity than others at the concentration of 5 mg/mL. In an antifeedant bioassay, the extract of  C. argenea  showed higher activity against the 1 st  larvae than that of other extracts (AF50 0.03 mg/mL), and  C. roseus  showed higher antifeedant activity to the 2 nd  to 5 th  larvae and adult of  B. longissima  (AF50 0.34, 0.33, 0.11, 0.43, and 0.20 mg/mL, respectively). The semi—field trial indicated that all extracts used in this study might reduce the pest population. Extracts of  C. argenea  and  M. micrantha  showed higher activities than that of  C. roseus  and  R communis,  and the decrease in population was 75.56% and 80.00% (without Abbott's correction) after seven days of treatment, respectively, at a concentration of 20 mg/mL. Therefore, these active botanical extracts may possess potential for use in control of  B. longissima.

Four Botanical Extracts are Toxic to the Hispine Beetle,Brontispa longissima,in Laboratory and Semi—field Trials