title: Insecticidal action of the polyphenolic rich fractions from the stem bark of Streblus asper on Dysdercus cingulatus.
abstract: Extracts from the stem bark of Streblus asper possess insecticidal activity against the fifth instar of Dysdercus cingulatus. Methanolic extract showed an LC(50) value of 5.56 microg/insect. Partition with chloroform increased the insecticidal activity (LC(50) 2.01 microg/insect). Three polyphenolic rich fractions were obtained from silica-gel column chromatography of the chloroform fraction and found to have noteworthy insecticidal activity (LC(50): 1.82 microg, 2.70 microg, 2.26 microg/insect) by topical application. This may provide a useful beginning for the development of biopesticides.
authors: Department of Biochemistry, University of Kerala, Thiruvananthapuram 695 581, India.
authors: M S
authors: MS
authors: Hashim
authors: K S
authors: KS
authors: Devi
mesh_terms: D000818:Animals; D005419:Flavonoids / Q000494:pharmacology; D020062:Heteroptera / Q000187:drug effects*; D007306:Insecticides / Q000494:pharmacology*; D007928:Lethal Dose 50; D029586:Moraceae; D010636:Phenols / Q000494:pharmacology; D008517:Phytotherapy; D024301:Plant Bark; D010936:Plant Extracts / Q000494:pharmacology*; D059808:Polyphenols
chemical_list: D005419:Flavonoids; D007306:Insecticides; D010636:Phenols; D010936:Plant Extracts; D059808:Polyphenols