Abstract
ABSTRACT. Photoperiodic control of facultative reproductive diapause was examined in females of the phytoseiid mite, Amblyseius potentillae (Garman). Full diapause was induced by rearing the mites from egg to adult under short‐day photoperiods. Egg‐laying females, however, which had experienced a long‐day photoperiodic regime during pre‐imaginal development, could still be induced to enter diapause when they were transferred to a short‐day regime. Diapause development proceeded slowly under a short‐day photoperiod, but was accelerated under long days. During diapause development under short days the photoperiodic sensitivity of the females diminished gradually and ultimately disappeared completely. However, after completion of diapause, sensitivity to photo‐period reappeared. A second diapause could be induced in post‐diapause females under short‐day photoperiods and completed again under long‐day photoperiods. These results show that A. potentillae remains sensitive to diapause‐inducing and diapause‐averting daylengths during the adult stage and that a second diapause may be induced after completion of the first one.
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