Differential hormonal control of hemolymph carbohydrates in Pieris brassicae L

1. 1. In last larval instar of Pieris brassicae, hemolymph carbohydrates were separated and identified by gas-liquid chromatography. Their individual variations were tested after injection of hyperglycemie and hypoglycemie insect and mammal factors. 2. 2. Trehalose level was affected by both hyper- and hypoglycemie insect and mammal factors. This showed a thin regulatory hormonal system in this species, especially for trehalose. 3. 3. Other carbohydrates could be divided into two groups according to their response to hormonal actions: the first one with melibiose, was chiefly hyperglycemie reacting carbohydrates and did not vary with hypoglycemie factors. The second one with glucose and sucrose, appeared to be mainly affected by hypoglycemie insect and mammal factors.