Termination of imaginal diapause of female Tetrix undulate (Sow.) (Orthoptera, Tetrigidae) by implantation of the corpora allata of an active female Locusta migratoria

The effect of implanted active corpora allata on the reproductive diapause in adult females of grasshopper, Tetrix undulata (Sow.) was investigated. Implantation of one corpus allatum originating from sexually mature, adult female Locusta migratoria donors effectively terminated reproductive diapause by inducing oocyte development and egg-laying. The diapause-break is the same in females reared at 8, 12, 16 hours light at 30 degrees or 25-20 degrees. There is no difference between females reared with male or without male.