Trissolcus comperei, a newly-reported egg parasitoid of Halyomorpha halys from China

• Published in: Biological control 2024-09, Vol.196, p.105583, Article 105583
• Main Authors: Shang, Cheng-Jie, Talamas, Elijah J., Wang, Xingeng, Chen, Yong-Ming, Zang, Lian-Sheng
• Format: Article
• Language: English
• Subjects: adults; Anastatus bifasciatus; Biological control; biological control agents; Brown marmorated stink bug; China; Egg parasitoid; eggs; Europe; females; Halyomorpha halys; host range; Immature stage; male genitalia; males; North America; ornamental plants; parasitism; parasitoids; progeny; pupae; species; trees; Trissolcus
• ISSN: 1049-9644; 1090-2112
• DOI: 10.1016/j.biocontrol.2024.105583

•Trissolcus comperei is an egg parasitoid of the brown marmorated stink bug (BMSB), newly found in Guizhou China.•Morphological characteristics of the immature stages and adult male of T. comperei are illustrated for the first time.•Seven of all 16 known Trissolcus species in China can parasitize BMSB eggs.•Trissolcus comperei may have potential for the control of BMSB due to its female biased progeny and high emergence rate. Native to Asia, the brown marmorated stink bug (BMSB), Halyomorpha halys (Stål) has become a serious invasive pest in North America and Europe. BMSB has an extremely wide host range in both its native and invaded ranges, and can cause severe damage to various tree fruits, vegetables, field crops and ornamentals. Species of Trissolcus are the major egg parasitoids, especially T. japonicus (Ashmead), T. mitsukurii (Ashmead) and Anastatus bifasciatus (Geoffroy) that have recently been studied as biological control agents for this invasive pest. In this study, we report newly a parasitoid parasitizing BMSB eggs collected in Guizhou Province, China, and it was identified as Trissolcus comperei (Crawford) using both morphological and molecular methods. We provide images of T. comperei male, male genitalia and immature stages, and describe some biological characteristics of T. comperei parasitizing BMSB eggs and parasitism capacity. Under 25 ± 1 °C, T. comperei egg hatched within 24 h, larva, prepupa and pupa developed in 1–3, 4–6 and 7–11 d, respectively. The parasitoid could parasitize 0-, 2- and 4-day-old BMSB eggs. Host egg age did not influence emergence rate of adult wasps (90.15–93.33 %). However, both the number of parasitized eggs (0.57–6.07 eggs/ 24 h) and percentage of female progeny (60.00–93.02 %) decreased with increasing host egg age. In addition, we compiled literature to provide a complete list of all 16 known Trissolcus species in China; seven of them have been reported to parasitize BMSB eggs, including T. comperei from this study. This information enriches the knowledge of the egg parasitoids of BMSB. Moreover, the high emergence rate and female-biased offspring of T. comperei could be important attributes as a potential biological control agent for BMSB eggs.