title: Host plant iridoid-based chemical defense of an aphid,Acyrthosiphon nipponicus, against ladybird beetles.
abstract: A Rubiaceae-feeding aphid,Acyrthosiphon nipponicus, is seldom attacked by the ladybird beetle,Harmonia axyridis. A potent deterrent against the beetle was isolated from the aphid and identified as paederoside, an iridoid glycoside originating in the aphid's host,Paederia scandens. The iridoid content was as high as 2% of the intact body weight, and a large portion was found in the cornicle secretion.
authors.affiliation: Pesticide Research Institute faculty of Agriculture, Kyoto University, Sakyo-ku, 606, Kyoto, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Nishida
authors.forename: H
authors.initials: H
authors.lastname: Fukami