Abstract
This paper describes the nature and titre of juvenile hormone at different developmental stages of the Colorado potato beetle, Leptinotarsa decemlineata Say, determined by a selective mass-spectroscopic detection technique, High levels of juvenile hormone III were observed in long-day beetles, whereas low titres occurred in pre-diapause and diapause adults. The level of juvenile hormone III in larvae was low compared with reproductive adults, whereas hardly any juvenile hormone could be detected in pupae. We were not able to detect juvenile hormones I or II. The results agree well with previously reported data using the Galleria bioassay.
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