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An Introduction to Parasitic Wasps of Drosophila and the Antiparasite Immune Response

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Is It Possible to Manipulate Scelionidae Wasps' Preference to a Target Host?

R Tognon^1,2, J Sant'Ana^3,4, L R Redaelli^3,4

¹Dept of Crop Protection, PPG-Fitotecnia, Federal Univ of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brasil. roberta.tognon@ufrgs.br.

Neotropical Entomology

|April 22, 2018

Summary

Parasitoid wasps Telenomus podisi and Trissolobasalis learn host preferences through experience. Pre-imaginal conditioning and exposure to host egg volatiles significantly altered parasitism behavior, demonstrating learning and memory in Telenomus podisi.

Keywords:

Telenomus podisi, Trissolcus basalis, Pentatomidae, Scelionidae, learning, parasitoid manipulation

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Area of Science:

Entomology
Chemical Ecology
Behavioral Ecology

Background:

Parasitoid host selection is crucial for insect pest control.
Chemical cues guide parasitoid behavior, but experience can modify innate responses.

Purpose of the Study:

To investigate the influence of immature experience on parasitism and chemotaxic behavior of Telenomus podisi and Trissolobasalis.
To assess the learning and memory capabilities of Telenomus podisi regarding host egg volatiles.

Main Methods:

Multiple-choice parasitism tests with three stink bug species (Euschistus heros, Piezodorus guildinii, Nezara viridula).
Olfactometer assays to evaluate chemotaxic responses of naive and experienced Telenomus podisi females to host egg volatiles.
Pre-imaginal conditioning of parasitoids on different host eggs.

Main Results:

Telenomus podisi parasitism was influenced by the original host, while Trissolobasalis consistently preferred Nezara viridula eggs.
Naive Telenomus podisi females showed positive chemotaxis to E. heros and P. guildinii egg volatiles, but not N. viridula.
Experienced Telenomus podisi females exhibited significant learning and memory for specific host egg volatiles for at least 24 hours, showing attraction to N. viridula.

Conclusions:

Parasitoid wasps demonstrate plasticity in host selection behavior based on experience.
Pre-imaginal conditioning and exposure to host volatiles can be used to manipulate parasitoid host preferences.
This research offers potential for biological control strategies by modifying parasitoid behavior.