Abstract
Trichogramma platneri oviposition behavior on Amorbia cuneana egg masses was investigated under laboratory conditions. No relationship was detected between host surface area, number of edge turning on host eggs, and parasitoid clutch size. It was also observed that females parasitized the egg mass randomly by drilling into the egg mass and parasitizing individual eggs without using stereotypical behaviors to assess individual hosts (i.e. drumming and turning). However, clutch size did change due to ovipositional experience as naïve wasps with little or no ovipositional experience (<6 eggs parasitized), allocated significantly more progeny per host than wasps with longer ovipositional experience (24-h oviposition experience on a single egg mass). Moreover, naïve wasps parasitized significantly more eggs on the outer edge of the egg mass than experienced wasps. We contend that the physical characteristics of A. cuneana eggs and egg masses preclude T. platneri from completely discriminating between individual eggs. However, because T. platneri may be using kairomones from the egg mass, this described oviposition strategy remains effective.
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Acknowledgements
We thank Rincon-Vitova Insectaries (Ventura, CA) for providing T. platneri, Max Badgely for providing the A. cuneana egg mass photograph, and Dave Machlitt for providing us with the Amorbia larvae to initiate cultures. We are grateful to Drs. Shannon Bros and Michael Kutilek for their insightful comments. We also thank Berry Smith (University of Toronto) and Josephine Jose for their helpful input, and many thanks to the anonymous reviewers for their valuable comments. Financial support was provided by the Pisano Research Fellowship from the Biological Sciences Department of San Jose State University. This study was performed in partial fulfillment of the Master’s degree to ZN.
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Nisani, Z., Honda, J.Y. Does the Polyphagous Egg Parasitoid Trichogramma platneri Nagarkatti (Hymenoptera: Trichogrammatidae) Display Behavioral Plasticity When Parasitizing Different Hosts?. J Insect Behav 23, 81–89 (2010). https://doi.org/10.1007/s10905-009-9197-9
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DOI: https://doi.org/10.1007/s10905-009-9197-9