Biogenic Amine Levels in the Haemolymph of the Cabbage Armyworm Larvae Mamestra brassicae Following Injection of Octopaminergic Insecticides

Abstract

Changes in haemolymph biogenic amine levels of the cabbage armyworm, Mamestra brassicae, last instar larvae following injection of octopaminergic insecticides were investigated by using HPLC-ECD. When octopaminergic insecticides, chlordimeform or 2-(4-chloro-o-toluidino)-2-oxazoline (AC-6), are injected, 4-tyrosine (TYR-4) is increased 10 min after injection. Clonidine injection also caused an increase of TYR-4. Based on these results, chemically induced insect stress is discussed. © 1991, Verlag der Zeitschrift für Naturforschung. All rights reserved.