CHANGES IN CATECHOLAMINES IN THE BRAIN-SUBESOPHAGEAL GANGLION COMPLEXDURING THE LAST LARVAL AND EARLY PUPAL STAGES OF THE CABBAGE ARMYWORM, MAMESTRA-BRASSICAE (LEPIDOPTERA, NOCTUIDAE)

Changes of the three catecholamines, epinephrine, norepinephrine and d opamine, in the brain-suboesophageal ganglion (Br-SG) complex were exa mined during the last larval and early pupal stages of the cabbage arm yworm, Mamestra brassicae, in relation to the induction of the pupal d iapause. The contents of the three catecholamines and some other bioge nic amines as well as their related compounds in Br-SG were simultaneo usly determined by high performance liquid chromatography (HPLC) equip ped 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 th ose that were not.