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Summer diapause in Chrysolina hyperici and C. quadrigemina (Coleoptera: Chrysomelidae) in relation to biological control of St John's wort, Hypericum perforatum (Clusiaceae)

Published online by Cambridge University Press:  10 July 2009

K. Schöps ,
P. Syrett  and
R.M. Emberson
K. Schöps*
Affiliation:
Zoologisches Institut der Universität Kiel, Germany
P. Syrett
Affiliation:
Manaaki Whenua — Landcare Research, Lincoln, New Zealand
R.M. Emberson
Affiliation:
Department of Entomology and Animal Ecology, Lincoln University, New Zealand
*
Correspondence and present address: K. Schöps, Department of Entomology and Animal Ecology, Lincoln University, PO Box 84, Lincoln, Canterbury, New Zealand.
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Abstract

The success of the chrysomelid beetles, Chrysolina hyperici (Forster) and C. quadrigemina (Suffrian), used widely for biological control of St John's wort (Hypericum perforatum) seems to depend on the synchronization of their phenologies with climate. The factors governing the termination of diapause in the field and laboratory were assessed in New Zealand. Before summer diapause, C. hyperici made up more than 70% of adult beetles in the field. Both species entered summer diapause at the beginning of January, but C. quadrigemina terminated diapause 3–4 weeks earlier (early March) than C. hyperici. Both male and female C. quadrigemina and male C. hyperici adults became sexually mature during summer diapause but C. hyperici females still had immature ovaries. Females of C. quadrigemina began laying eggs immediately after summer diapause but females of C. hyperici did not oviposit until more than 2 weeks after they terminated diapause in late March. In the laboratory summer diapause was terminated in both species by short day length, not by simulated rainfall, contradicting previous assumptions that autumn rainfall is the critical factor. The demonstrated differences in phenology are reflected in different overwintering strategies for the two species. Because C. hyperici overwinters in the egg stage, this species will be a more successful biological control agent of St John's wort in countries with cold winters than C. quadrigemina, which overwinters in the more vulnerable larval stage. However, in countries with mild winters C. quadrigemina is more successful in controlling St John's wort than C. hyperici, since it has a developmental lead with its larvae feeding and growing during the winter.

Type
Review Article
Information
Bulletin of Entomological Research , Volume 86 , Issue 5 , October 1996 , pp. 591 - 597
Copyright
Copyright © Cambridge University Press 1996

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