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Synchronous growth of a parasitoid, Perilitus coccinellae, and teratocytes with the development of the host, Coccinella septempunctata

The relationship between the development of Coccinella septempunctata brucki Mulsant (Coleoptera: Coccinellidae) and its parasitoid, Perilitus coccinellae (Schrank) (Hymenoptera: Braconidae) was studied at two photoperiods (L16:D8 and L12:D12) at 26 °C. The development of P. coccinellae is well synchronized with the physiological state of the host, C. septempunctata, which can be parasitized not only as adult but also as larva or pupa. The parasitoid larva completed larval development within 19 days in a non‐diapausing host, while in diapausing adults as well as in pupae held at diapause‐averting conditions, the parasitoid larva ceased growth at the first instar. Growth was resumed when diapause of the host terminated or by the emergence of the adult host from the pupa.