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      Overwintering strategies and cold hardiness of two aphid parasitoid species (Hymenoptera: Braconidae: Aphidiinae)

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      Journal of Insect Physiology
      Elsevier BV

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          Abstract

          The role of winter diapause in two aphid parasitoid species, Aphidius ervi Haliday and Aphidius rhopalosiphi DeStefani-Peres (Hymenoptera: Braconidae: Aphidiinae), in host synchronization and the induction of cold hardiness was investigated. Parasitoids were reared during three successive generations on Sitobion avenae Fabricius, at 15 degrees C under a photoperiod of 9 h light 15 h dark. Although these conditions are known to be strongly diapause inducing, neither parasitoids showed an incidence of diapause above 65% over the three generations; the rest of the population underwent quiescence. In both parasitoid species, diapausing mummies exhibited greater cold hardiness than non-diapausing mummies, resulting in significantly lower supercooling points (SCP) and in a higher survival rate during long-term exposures at 0 and -10 degrees C. The induction of increased cold hardiness in parasitoids was thus associated with the diapause state. SCPs of third instar larvae of S. avenae were similar to those of non-diapausing mummies of both parasitoid species, but significantly higher than those of diapausing mummies. The effect of winter climate on the stability of the host-parasitoid interaction is discussed.

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          Author and article information

          Journal
          Journal of Insect Physiology
          Journal of Insect Physiology
          Elsevier BV
          00221910
          May 2000
          May 2000
          : 46
          : 5
          : 671-676
          Article
          10.1016/S0022-1910(99)00155-9
          10742515
          0ef53dcd-fe01-4be7-82f6-c3e1d335a895
          © 2000

          https://www.elsevier.com/tdm/userlicense/1.0/

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