Abstract
Adult field crickets, Gryllus bimaculatus, with a low endogenous moulting hormone titre (animals reared at constant 20°C) were injected with ecdysone and 20-hydroxyecdysone. Repeated injections of 2–5 μg/female caused an increase in ovarian fresh weight and stimulated oviposition. The response to exogenous moulting hormones was shown to be dose dependent. In adult males injections of moulting hormones as well as ringer solution lowered the total number of spermatophores.
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