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Influence of original host on chemotaxic behaviour and parasitism in Telenomus podisi Ashmead (Hymenoptera: Platygastridae)

Published online by Cambridge University Press:  03 September 2014

R. Tognon*
Affiliation:
Crop Protection Department, Faculty of Agronomy, Federal University of Rio Grande do Sul, Av. Bento Gonçalves 7712, 91540-000, Porto Alegre, RS, Brazil
J. Sant'Ana
Affiliation:
Crop Protection Department, Faculty of Agronomy, Federal University of Rio Grande do Sul, Av. Bento Gonçalves 7712, 91540-000, Porto Alegre, RS, Brazil
S.M. Jahnke
Affiliation:
Crop Protection Department, Faculty of Agronomy, Federal University of Rio Grande do Sul, Av. Bento Gonçalves 7712, 91540-000, Porto Alegre, RS, Brazil
*
*Author for correspondence Phone: 5551 3308-7414 Fax: 5551 3308-6015 E-mail: roberta.tognon@ufrgs.br

Abstract

The egg parasitoid Telenomus podisi is a natural control agent of pentatomids, including Euschistus heros and Tibraca limbativentris, and success of parasitism is dependent upon the parasitoid finding the host. We tested the influence of host egg volatiles and the synthetic sex pheromone (zingiberenol) of T. limbativentris on chemotaxic behaviour of T. podisi, as well as, the impact of the original host on parasitoid selection. We used mated female T. podisi (48 h old) that emerged from the eggs of T. limbativentris or E. heros. The bioassays related to chemotaxy were performed in a Y-tube olfactometer and, to parasitism success, in laboratory and semi-field conditions. Telenomus podisi females that emerged from either the stink bug eggs, chose the pheromone more than control, or the pheromone plus eggs of E. heros in the semi-field bioassay, led to greater parasitism. Females that emerged from E. heros eggs chose egg volatiles from their original host rather than those from T. limbativentris, while females emerging from T. limbativentris, chose the egg volatiles of both hosts equally. When T. limbativentris was the original host, T. podisi females parasitized T. limbativentris over E. heros, while those emerging from E. heros exclusively parasitized E. heros eggs. These results demonstrated that T. podisi is more likely to parasitize the host in which it developed and that the original host can exert influence on the choice by those parasitoids. Understanding how the factors that mediate host–parasitoid communication are interrelated can help biological control programmes establish more effective and reliable tools with T. podisi.

Type
Research Papers
Copyright
Copyright © Cambridge University Press 2014 

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