Abstract
Trissolcus spp. are egg parasitoids of sunn pest, Eurygaster integriceps Puton (Hemiptera: Scutelleridae). Direct (extrinsic) competition between female T. grandis and T. vassilievi was investigated in the laboratory by releasing different numbers (from one to 16) of one or both species into a multi-patch environment consisting different numbers of E. integriceps egg masses. Larval (intrinsic) competition was examined in host eggs multiparasitized at intervals ranging from 0 to 48 h. Survival of females was also assayed when stored at 4 °C. Trissolcus grandis reduced the searching efficiency of congeneric rivals more than did T. vassilievi, and was a superior intrinsic competitor within multiparasitized eggs, although both species benefited from a significant ‘first attack’ advantage. Trissolcus vassilievi was more efficient than T. grandis when parasitizing host eggs at high conspecific densities. Mortality at 4 °C was lower in groups ≥ 10 than in groups ≤ 5, and T. grandis survived longer than T. vassilievi.
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Acknowledgements
Financial support for this research was provided by the University of Tabriz, Iran. The authors are grateful to Shahriar Asgari and Farnaz Shafaei for their assistance in collecting host eggs and parasitoids from Varamin county and West Azerbaijan Province, respectively.
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Iranipour, S., Michaud, J.P., Najafipour, M. et al. Interspecific competition and comparative cold tolerance in two egg parasitoids of sunn pest, Eurygaster integriceps. BioControl (2024). https://doi.org/10.1007/s10526-024-10246-5
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DOI: https://doi.org/10.1007/s10526-024-10246-5