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Assessing phenological synchrony between the Chinese sawfly, Cephus fumipennis (Hymenoptera: Cephidae), its egg-larval parasitoid, Collyria catoptron (Hymenoptera: Ichneumonidae), and the North American sawfly, Cephus cinctus: implications for biological control

Published online by Cambridge University Press:  07 December 2015

Tatyana A. Rand*
Affiliation:
Northern Plains Agricultural Research Laboratory, United States Department of Agriculture-Agricultural Research Service, Sidney, Montana 59270, United States of America
Wendell L. Morrill
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, Montana 59717, United States of America
Justin B. Runyon
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, Montana 59717, United States of America
Kim A. Hoelmer
Affiliation:
United States Department of Agriculture-Agricultural Research Service, European Biological Control Laboratory, Montferrier-sur-Lez, France
Thomas G. Shanower
Affiliation:
Northern Plains Agricultural Research Laboratory, United States Department of Agriculture-Agricultural Research Service, Sidney, Montana 59270, United States of America
Jeffrey L. Littlefield
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, Montana 59717, United States of America
David K. Weaver
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, Montana 59717, United States of America
*
4 Corresponding author (e-mail: [email protected]).

Abstract

Many pest and beneficial insects overwinter as larvae in a state of diapause, with development resuming in the spring. In these cases, rates of post-diapause development of parasitoids must be synchronised with the vulnerable life stages of their hosts. Phenological asynchrony between introduced parasitoids and their targeted hosts has limited the success of some biological control efforts. Here, we assess the potential synchrony between Collyria catoptron Wahl (Hymenoptera: Ichneumonidae), a parasitoid of the Chinese wheat stem sawfly, Cephus fumipennis Eversmann (Hymenoptera: Cephidae), which is being considered as a biological control against a novel host species, Cephus cinctus Norton, in North America. We compared development timing and emergence patterns of both native and exotic species of sawflies with that of the parasitoid. We found that the mean number of days between termination of larval diapause and adult eclosion varied by less than one day across species, and patterns of emergence were also similar. The rate of development of this egg-larval parasitoid was within the range necessary to attack C. cinctus eggs. Furthermore, the development of C. cinctus from western Montana, United States of America most closely matched that of the parasitoid, suggesting western Montana as a possible release area.

Type
Insect Management
Copyright
© Entomological Society of Canada. Parts of this work are that of the U.S. Government and therefore such parts are not subject to copyright protection in the United States 2015 

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Footnotes

Subject editor: Keith Summervitle

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