Physiological Control of Pheromone Release Behaviour in Manduca sexta (L.)
Calling behaviour in the female tobacco hornworm moth, Manduca sexta (L.) (Lepidoptera: Sphingidae) is controlled by the neural output from the brain and/or the suboesophageal ganglion. This conclusion is supported by 3 lines of evidence. (1). Bisection of the nerve cord in the cervical region or the abdomen prevents gland extrusion. (2). Increased nervous activity in the ventral nerve cord is associated with pheromone gland extrusion. (3). Gross electrical stimulation of the ventral nerve cord triggered short periods of pheromone gland extrusion. While gland extrusion is triggered by a neural signal, the coordination of gland extrusion is intrinsic to the terminal abdominal ganglion. We found no evidence for the existence of a hormone that triggers calling. The removal of the corpora allata and the corpora cardiaca had no effect on calling. Injections of blood from calling females into non-calling females did not initiate or hasten the onset of calling in the injected females.
Itagaki, Harry and Conner, W E., "Physiological Control of Pheromone Release Behaviour in Manduca sexta (L.)" (1986). Journal of Insect Physiology 32(7): 657-664. Faculty Publications. Paper 120.
Journal of Insect Physiology