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Comparative study of the population level effects of carbaryl and abamectin on larval ectoparasitoid Habrobracon hebetor Say (Hymenoptera: Braconidae)

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Abstract

Habrobracon hebetor Say is one of the most important ectoparasitoids of the larval stage of many invasive agricultural pests such as noctuid and pyralid moths. Lethal and sublethal effects of carbaryl and abamectin were assessed on the ectoparasitoid H. hebetor in laboratory conditions. Dose–response bioassays were carried out on immature and adult stages by using dipping and contact residue methods, respectively. LC50 (lethal concentration for 50%) values of carbaryl and abamectin were 31.19 and 4.16 mg a.i. l−1 on larval stage and 12.6 and 4.42 mg a.i. l−1 on adults, respectively. In order to assess the sublethal effects, adult wasps were exposed to an LC30 of each insecticide and then the demographic parameters of live wasps were studied. The results showed that the intrinsic rate of increase (r m ), finite rate of increase (λ), net reproductive rate (R0) and gross reproductive rate (GRR) were significantly affected by the insecticides. The highest and the lowest r m values were 0.23 and 0.17 in control and carbaryl-treated insects, respectively. The sex ratio of H. hebetor offspring was not significantly affected by either insecticide. The results showed that carbaryl had more adverse effects on population parameters of the parasitoid compared to abamectin. Field studies are needed to determine the total effects of the pesticides on H. hebetor.

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Acknowledgments

We thank Dr. George Kamita (Department of Entomology, University of California, Davis, USA) for improving the manuscript and valuable comments and suggestions. We also thank Dr. Mehdi Hassanpour for helping in analyzing data. The technical assistance of Mrs. Farzani and Mrs. Vosoughian is greatly appreciated. This study received financial support from Postgraduate Education Bureau of the University of Maragheh. This research is part of the Master Science project of Vahid Mahdavi devoted to Evaluation of susceptibility of ectoparasitoid Habrobracon hebetor Say (Hymenoptera: Braconidae) to conventional and biorational insecticides and entomopathogenic fungi Metarhizium anisoplia and Beauveria bassiana in laboratory. Dr. Moosa Saber, Dr. Hooshang Rafiee-Dastjerdi and Dr. Ali Mehrvar are the supervisor and advisors of this project, respectively. This work was carried out at University of Maragheh, Iran.

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Authors and Affiliations

  1. Department of Plant Protection, College of Agriculture, University of Maragheh, Maragheh, Iran

    Vahid Mahdavi, Moosa Saber & Ali Mehrvar

  2. Department of Plant Protection, College of Agriculture, University of Mohaghegh Ardabili, Ardabil, Iran

    Hooshang Rafiee-Dastjerdi

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  1. Vahid Mahdavi
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  2. Moosa Saber
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  3. Hooshang Rafiee-Dastjerdi
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  4. Ali Mehrvar
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Correspondence to Moosa Saber.

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Mahdavi, V., Saber, M., Rafiee-Dastjerdi, H. et al. Comparative study of the population level effects of carbaryl and abamectin on larval ectoparasitoid Habrobracon hebetor Say (Hymenoptera: Braconidae). BioControl 56, 823–830 (2011). https://doi.org/10.1007/s10526-011-9356-8

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  • DOI: https://doi.org/10.1007/s10526-011-9356-8

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