Spermatogenesis in Diapausing Adult of Gastrophysa atrosyanea MOT. (Coleoptera: Chrysomelidae)

Abstract

Gastrophysa atrocyanea is a univoltine beetle which enters diapause at the adult stage. Storage at 5°C for at least 4 months or application of JH was necessary for ending the diapause. Sperm was not found in the prediapause period and even after 6 months' storage at 5°C throughout the total diapause period. A minimum of 3 months' exposure to 25°C was required for the sperm to form.