Abstract
Polistes metricus females emerging from nests collected in eastern Kansas in June, July, and August were kept separately at 26°C with a 16 hr photoperiod or at 22°C with a 14 hr photoperiod. After 7- and 15-day incubations, dissections revealed that only the June long day wasps had significantly well-developed ovaries. This suggests that after June, these wasps are in diapause. It is possible that both adult and immature wasps are sensitive to a diapause cue, and that the July and August adults had already been induced to diapause when they were immature. Topical application of 0·2 or 0·5 μl of Ayerst synthetic juvenile hormone per wasp caused ovarian development in July adults kept at 26°C with a 16 hr photoperiod, suggesting that this diapause is reversible by juvenile hormone.
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