Changes in the free amino acids of the haemolymph of diapause and non-diapause pupae of the cotton bollworm,Heliothis armigera Hbn. (Lepidoptera: Noctuidae)

Summary The concentration of free amino acids in the haemolymph of non-diapausing and diapausing pupae ofHeliothis armigera was investigated. 20 amino acids were detected in the haemolymph of the studied stages. Asparagine, glutamine, cystine, ornithine, histidine and valine were the predominant free amino acids at all stages. The diapause resulted in increased levels of most of the amino acids.