Multiparasitism and competition between Ooencyrtus telenomicida and Ooencyrtus fecundus (Hymenoptera: Encyrtidae) two species of sunn pest Eurygaster integriceps egg parasitoids

Iranipour, Shahzad; Jalal Kor, Ehsan; Asgari, Shahriar

doi:10.22092/jaep.2024.363255.1486

Document Type : Agricultural Entomology

Authors

¹ Department of Plant Protection, Faculty of Agriculture, University of Tabriz, Tabriz, Iran

² Plant Protection Research Department, Tehran Agricultural and Natural Resources Research and Education Center, AREEO, Varamin, Iran

https://doi.org/10.22092/jaep.2024.363255.1486

Abstract

Ooencyrtus telenomicida Vassiliev and Ooencyrtus fecundus Ferrier & Voegele (Hymenoptera, Encyrtidae), egg parasitoids of Eurygaster integriceps Puton (Hemiptera: Scutelleridae) are sympatric and have widely overlapping niches, hence competitive displacement is expected. However, in natural habitats, they peacefully coexist. In this study, direct competition between larvae was investigated by two separate experiments. In the first experiment, multiparasitism was studied by the simultaneous release of an equal number of the two species at different densities of both parasitoid and host. In the second experiment, the sequential release of an inexperienced female of the two species with different time intervals from 3 h to 10 d was investigated. The multiparasitism experiment in 3h to 10 d intervals showed a 2.35-fold advantage of O. telenomicida over telytokous O. fecundus. The simultaneous parasitism by the two species showed a 3-fold advantage of O. telenomicida in lower densities, which it enhanced to 15-fold at higher parasitoid densities. Results revealed the advantage of the bisexual population of O. telenomicida over thelytokous O. fecundus, which in higher densities may also lead to the exclusion, although such densities are seldom expected in nature. Moreover, the results of the competition between the two bisexual populations is still unknown.

Keywords

Main Subjects

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Multiparasitism and competition between Ooencyrtus telenomicida and Ooencyrtus fecundus (Hymenoptera: Encyrtidae) two species of sunn pest Eurygaster integriceps egg parasitoids

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Volume 91, Issue 2 - Serial Number 117July 2024Pages 173-184

Volume 91, Issue 2 - Serial Number 117
July 2024
Pages 173-184