title: Four botanical extracts are toxic to the hispine beetle, Brontispa longissima, in laboratory and semi-field trials.
abstract: 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.
authors.affiliation: Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang, Hainan, China. lvchaojun5783@sina.com
authors.forename: Chaojun
authors.initials: C
authors.lastname: Lv
authors.forename: Baozhu
authors.initials: B
authors.lastname: Zhong
authors.lastname: Zhong Guohua
authors.forename: Qunfang
authors.initials: Q
authors.lastname: Weng
authors.forename: Shaohua
authors.initials: S
authors.lastname: Chen
authors.forename: Meiying
authors.initials: M
authors.lastname: Hu
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Sun
authors.forename: Weiquan
authors.initials: W
authors.lastname: Qin
mesh_terms: D000818:Animals; D030008:Catharanthus / Q000737:chemistry; D034762:Celosia / Q000737:chemistry; D001517:Coleoptera / Q000187:drug effects*; D005247:Feeding Behavior / Q000187:drug effects; D005260:Female; D007306:Insecticides / Q000032:analysis* / Q000633:toxicity; D007814:Larva; D008297:Male; D035742:Mikania / Q000737:chemistry; D010063:Ovum; D010936:Plant Extracts / Q000737:chemistry* / Q000633:toxicity; D012278:Ricinus / Q000737:chemistry
chemical_list: D007306:Insecticides; D010936:Plant Extracts