Abstract
Successful pest management using parasitoids requires careful evaluation of host-parasitoid interactions. Here, we report the performance of larval ecto-parasitoid wasp, Bracon brevicornis (Wesmael) on important agricultural pests, Spodoptera litura (Fabricius) and S. frugiperda (J.E. Smith). Biology of B. brevicornis was studied on different host instars under laboratory and cage setup. In no-choice assay, the parasitoid development was highest on fifth-instar S. litura larvae as the wasp laid ~ 253 eggs with 62% hatching, 76% pupae formation and 78% adult emergence. Similarly, these parameters were highest on fifth instar S. frugiperda larvae (293 eggs, 57% hatching, 80% pupae formation, 70% adult emergence). In two-choice assay, B. brevicornis preferred fourth or fifth over third instar larvae of both hosts. Successful parasitism depends on host paralysis and suppression of host immunity. B. brevicornis interaction downregulated cellular immunity of both hosts as shown by reduced hemocyte viability and spreading. The percent parasitism rate of B. brevicornis was unaltered in the presence of host plant, Zea mays in cage study. 76 and 84% parasitism was observed on fifth-instar larvae of S. litura and S. frugiperda, respectively. We evaluated the performance of B. brevicornis as a biocontrol agent on S. frugiperda in maize field. Our results show 54% average reduction in infestation after release of B. brevicornis. Taken together, we report the performance of B. brevicornis on important insect pests for the first time in laboratory and field conditions. Our findings indicate that B. brevicornis is a promising candidate for integrated pest management.
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Acknowledgments
Funding from NCBS, Max Planck Gesellschaft (Partner Group Program), DBT-NER grant and Ramanujan Fellowship is acknowledged. The authors thank Indian Council of Agricultural Research, New Delhi, for research support and Dr. Sane lab, NCBS, for parasitoid behavior recording. The authors thank TNAU for initial culture of B. brevicornis. The authors acknowledge Dr. kavitha Isvaran, IISc and Pankaj Kumar Chauhan for their input in statistical analysis.
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Ghosh, E., Varshney, R. & Venkatesan, R. Performance of larval parasitoid, Bracon brevicornis on two Spodoptera hosts: implication in bio-control of Spodoptera frugiperda. J Pest Sci 95, 435–446 (2022). https://doi.org/10.1007/s10340-021-01385-0
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DOI: https://doi.org/10.1007/s10340-021-01385-0