title: Vapor-phase toxicity of Derris scandens Benth.-derived constituents against four stored-product pests.
abstract: The vapor-phase toxicity of Derris scandens Benth.-derived constituents was evaluated against four stored-product pests ( Callosobruchus chinensis L., Sitophilus oryzae L., Rhyzopertha dominica L., and Tribolium castaneum H.) using fumigation bioassays and compared to those of commonly used insecticides. The structures of all constituents of were characterized by spectroscopic analyses [nuclear magnetic resonance (NMR) and mass spectrometry]. The sensitivity of the test insect to compounds varied with exposure time, concentration, and insect species. Over 100% mortality after 24 h was achieved with the compounds osajin (2), scandinone (5), sphaerobioside (8), and genistein (9) against all of the test insects, while laxifolin (3) and lupalbigenin (4) showed 100% mortality after 72 h against T. csataneum and R. dominica . Scandenone (1), scandenin A (6), and scandenin (7) were less effective. Among the insects, C. chinensis , S. oryzae , and R. dominica were more susceptible to the treatments, whereas T. castaneum was less susceptible. The results of fumigation tests indicated that compounds from D. scandens whole plant extract are potential candidates to control stored-product pests.
authors.affiliation: Division of Organic Chemistry-I, Natural Product Laboratory, Indian Institute of Chemical Technology (CSIR) , Tarnaka, Hyderabad 500 607, India.
authors.forename: Atmakur
authors.initials: A
authors.lastname: Hymavathi
authors.forename: Peta
authors.initials: P
authors.lastname: Devanand
authors.forename: Katragadda
authors.initials: K
authors.lastname: Suresh Babu
authors.forename: Thonthula
authors.initials: T
authors.lastname: Sreelatha
authors.forename: Usha Rani
authors.initials: UR
authors.lastname: Pathipati
authors.forename: Janaswamy
authors.initials: J
authors.lastname: Madhusudana Rao
mesh_terms: D000818:Animals; D001517:Coleoptera; D029866:Derris / Q000737:chemistry*; D002523:Edible Grain; D005519:Food Preservation; D005651:Fumigation; D007300:Insect Control / Q000379:methods*; D007306:Insecticides; D010936:Plant Extracts; D014231:Tribolium; D014835:Volatilization
chemical_list: D007306:Insecticides; D010936:Plant Extracts