Abstract
Changes of the three catecholamines, epinephrine, norepinephrine and dopamine, in the brain-suboesophageal ganglion (Br-SG) complex were examined during the last larval and early pupal stages of the cabbage armyworm, Mamestra brassicae, in relation to the induction of the pupal diapause. The contents of the three catecholamines and some other biogenic amines as well as their related compounds in Br-SG were simultaneously determined by high performance liquid chromatography (HPLC) equipped with an electrochemical detector (ECD). During the last larval and early pupal stage, variable patterns of catecholamine contents in Br-SG differed between the animals that were destined for diapause and those that were not.
