Role of the neuroendocrine complex in the control of adult diapause in the bean bug, Riptortus clavatus.

In the bean bug, Riptortus clavatus, allatectomy suppressed reproduction in adults reared under nondiapause-inducing long-day conditions, and transection of the nervi corporis allati induced reproduction in adults reared under diapause-inducing short-day conditions. These effects of allatectomy and denervation were observed both in the morphology of reproductive organs and in the electrophoresis pattern of hemolymph proteins in both sexes. These results indicate that, in diapause adults, the brain suppresses the activity of the corpus allatum to secrete juvenile hormone through nervous pathways. The removal to the corpora cardiaca-carpus allatum complex in females not only inhibited ovarian development, as allatectomy did, but also prevented mature eggs in the oviduct from being laid. Therefore, it is assumed that the corpora cardiaca release an oviposition-stimulating substance.