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Effect of vermiwash-treated plants on the population growth parameters of Diadegma semiclausum (Hellen) (Hymenoptera: Ichneumonidae) on its host Plutella xylostella (Linnaeus) (Lepidoptera: Plutellidae)

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Abstract

The parasitoid wasp Diadegma semiclausum Hellen (Hymenoptera: Ichneumonidae) is an effective endoparasitoid for controlling the larvae of Plutella xylostella (L.) (Lepidoptera: Plutellidae). Fertilizer application can induce resistance mechanisms in plants against herbivores. In bottom-up effects, resistance-related signaling pathways triggered by fertilizers in plants may affect the fitness of natural enemies. This study aimed to investigate the effect of induced resistance by vermiwash on some fitness-related parameters of D. semiclausum, including immature survival, development time, reproduction, and life table parameters. The experiment was conducted in a standard climate chamber set at 25 ± 1 °C, a photoperiod of 16 h light: 8 h dark, and 65 ± 5% RH. The results showed that D. semiclausum developing within P. xylostella larvae reared on vermiwash-treated canola plants had a longer duration and lower survivorship of immature stages than those developing within P. xylostella larvae reared on untreated canola plants (control). Furthermore, the parasitoid females that emerged from the vermiwash treatment deposited fewer eggs compared to those emerging from the control treatment. The R0 and r values of D. semiclausum were lower on the vermiwash treatment (9.96 offspring/female and 0.150 day−1, respectively) compared to the control population (15.94 offspring/female and 0.198 day−1, respectively). These results suggest that if vermiwash is sprayed on canola and P. xylostella larvae feed on the plant, it has the potential to adversely affect the population growth of D. semiclausum. Therefore, more care should be taken regarding the application of this fertilizer in D. semiclausum-based integrated pest management (IPM) programs.

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Acknowledgements

We acknowledge Dr. Matthias Riedel (Zoological Museum, Munich, Germany) for identifying the parasitoid wasp, and we are grateful for the financial support received from the University of Mohaghegh Ardabili (Ardabil, Iran) to conduct this study.

Funding

This study was funded by the University of Mohaghegh Ardabili.

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J Razmjou conceived the ideas and designed the methodology. Z Feli Kohikheili performed the experiments. J Razmjou and Z Feli Kohikheili the data and wrote and revised the first draft of the manuscript. B Naseri and M Hassanpour edited the manuscript. All authors gave final approval for submission.

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Correspondence to Jabraeil Razmjou.

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All authors declare there are not any conflicts of interest in this work.

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Kohikheili, Z.F., Razmjou, J., Naseri, B. et al. Effect of vermiwash-treated plants on the population growth parameters of Diadegma semiclausum (Hellen) (Hymenoptera: Ichneumonidae) on its host Plutella xylostella (Linnaeus) (Lepidoptera: Plutellidae). Int J Trop Insect Sci 44, 931–938 (2024). https://doi.org/10.1007/s42690-024-01213-9

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  • DOI: https://doi.org/10.1007/s42690-024-01213-9

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