Diapause and post-diapause quiescence demonstrated in overwintering Harmonia axyeidis (Coleoptera: Coccinellidae) in northwestern Europe

C.L. Raak-van den Berg, P.W. de Jong, L. Hemerik, J.C. van Lenteren

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)

Abstract

The Asian ladybird Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) is regarded as an invasive species in many parts of the world. In a previous study we hypothesised that H. axyridis enters diapause at the end of October and then shifts to a quiescent state in December in northwestern Europe. In the present study we test this idea of a short, early period of diapause by sampling beetles from their hibernation sites immediately after their migratory flights in October, subsequently keeping them in outdoor cages, and then, after certain time-intervals, measuring the pre-oviposition time under optimal egg-laying laboratory conditions at 25 degrees C. We did this at both short (12L) and long (16L) photoperiods, since a photoperiodic response is an indicator of true diapause, rather than quiescence. A significant, albeit small, difference in pre-oviposition period between the two photoperiods, which disappears in December, corroborates our earlier hypothesis that the ladybirds are in a state of diapause until mid-December. Compared with that of native ladybirds the diapause of H. axyridis generally is relatively short and weak; moreover, it appears to have become shorter over the last decade. This flexibility in diapausing behaviour may be an important factor that contributes to the invasive success of H. axyridis.
Original languageEnglish
Pages (from-to)585-591
JournalEuropean Journal of Entomology
Volume110
Issue number4
DOIs
Publication statusPublished - 2013

Keywords

  • lady beetle
  • photoperiodic response
  • winter survival
  • septempunctata
  • reproduction
  • temperature
  • netherlands
  • invasion
  • behavior
  • spread

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