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10-Minute Presentation

Plant-Insect Ecosystems

10-min: P-IE, Biocontrol

A survey on egg parasitism of the native green shield bug, Palomena prasina L. and exotic brown marmorated stink bug, Halyomorpha halys (Stål) (Hemiptera: Pentatomidae) in northwest Türkiye

Sunday, November 9, 2025
8:00 AM - 8:12 AM Pacific
Location: Oregon Convention Center, E145, OCC
Oral Presentation

    Presenting Author(s)

  • IO

    I. Oguz Ozdemir (he/him/his)

    Post-Doc Scholar
    Oregon State University
    Corvallis, Oregon

    • Co-Author(s)

  • MS

    M. Fatih Silbir

    Sakarya university of applieed sciences, faculty of agriculture, dept. of plant protection
    Sakarya, Sakarya, Turkey

  • EK

    Eren Karadag

    Sakarya university of applied sciences, faculty of agriculture, dept. of plant protection
    sakarya, Sakarya, Turkey

  • AA

    Abdullatif Alaybay

    Sakarya university of applied sciences, faculty of agriculture, dept. of plant protection
    Sakarya, Sakarya, Turkey

  • Vaughn M. Walton

    Oregon State University
    Corvallis, Oregon

  • GO

    Goksel Ozer

    Bolu Abant Izzetli Baysal University
    Bolu, Bolu, Turkey

  • FT

    Francesco Tortorici

    University of Torino Department of Agricultural, Forest, and Food Sciences (DISAFA)
    Torino, Emilia-Romagna, Italy

  • FD

    Furkan Dogan

    Sakarya university of applied sciences, faculty of agriculture, dept. of plant protection
    Sakarya, Sakarya, Turkey

This study is aimed to determine the parasitism rates, composition, and efficiency of parasitizing species on naturally laid eggs of the green shield bug (GSB) Palomena prasina L. (Hemiptera: Pentatomidae) and the invasive brown marmorated stink bug (BMSB) Halyomorpha halys (Stål) (Hemiptera: Pentatomidae), which are the main insect pests in the hazelnut orchards of Sakarya and Duzce, the main hazelnut production areas of Türkiye, during 2023 and 2024 years. A total of 19,265 eggs were gathered from 49 orchards in Sakarya and Düzce provinces, comprising 10,775 (411 egg masses) of GSB eggs and 8,490 (308 egg masses) of BMSB eggs. These eggs were brought to the laboratory and observed for parasitoid emergence in a climate chamber (25 °C, 70% RH, and 16:8 L:D). The morphological and molecular identification of the emerging parasitoids revealed that the overall parasitism rate of GSB eggs was 15.57%, which was caused by Trissolcus belenus (42.91%), Tr. Cultratus (23.72%), Telenomus turesis (26.40), Te. Truncatus (6.56%), and Anastatus bifasciatus (0.42%). BMSB eggs had an overall parasitism rate of 1.98%, which was caused by Tr. belenus (26.19%), Te. truncatus (16.67%), and A. bifasciatus (15.48%). The species that parasitized GSB eggs with the highest discovery (12.02%) and exploitation efficiency (38.52%) was found to be Tr. belenus. While native egg parasitoid species are assumed to be ineffective in parasitizing BMSB eggs due to evolutionary incompatibility with the host, the presence of natural parasitism in native GSB eggs is promising, but specific effectiveness studies of parasitoid species are required.