Long-chain alkanes and fatty acids from Ludwigia octovalvis weed leaf surface waxes as short-range attractant and ovipositional stimulant to Altica cyanea (Weber) (Coleoptera: Chrysomelidae)

摘要: The importance of leaf surface wax compounds from the rice-field weed Ludwigia octovalvis (Jacq.) Raven (Onagraceae) was determined in flea beetle Altica cyanea (Weber) (Coleoptera: Chrysomelidae). Extraction, thin layer chromatography and GC-MS GC-FID analyses waxes young, mature senescent leaves revealed 20, 19 n -alkanes between -C 15 35 , respectively; whereas 14, 14 12 free fatty acids C12:0 C22:0 were identified leaves, respectively. Tricosane predominant -alkane young whilst eicosane predominated leaves. Heneicosanoic acid, palmitic acid docosanoic most abundant A. females showed attraction to 0.25 equivalent compared with or a short glass Y-tube olfactometer bioassay. insects attracted synthetic blend 0.90, 1.86, 1.83, 1.95, 0.50 0.18 µg ml −1 petroleum ether hexadecane, octadecane, eicosane, tricosane, alpha-linolenic respectively, comparable proportions as present waxes. also laid eggs on filter paper moistened This finding could provide basis for monitoring potential biocontrol agent field.