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Maternal influence on diapause induction: an approach to improve long-term storage of Trichogramma chilonis

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Abstract

We have investigated the role of the thermo-photoperiodic condition of maternal generation in diapause induction of Trichogramma chilonis (Ishii) (Hymenoptera: Trichogrammatidae) lab strain. To test the maternal effect, two lines of T. chilonis lab strain were generated by rearing them for one generation at: (1) 15 °C with L:D-12:12 (15F-112) and (2) 15 °C with L:D-20:4 (15F-120). The laboratory strain reared at 15 °C with L:D-12:12 for 65 generations (15F-6512) was used as the control (acclimatized strain) due to its proven diapausing capacity. The 15F-120 line failed to undergo diapause, though healthy pre-pupae were formed at the pre-storage condition (at 10 °C with L:D- 8:16 and RH-60-70%). However, 15F-112 line could successfully complete all the phases of diapause and was comparable with the control batch. Considering 50% adult emergence and minimum 3 days of longevity, 125 days of storage could be achieved. From our current study, we conclude that diapause can be induced in T. chilonis lab strain by providing appropriate thermo-photoperiod to their maternal generation (for a single generation) followed by suitable diapause inducing and terminating protocols.

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Acknowledgements

The funding provided by the Department of Biotechnology, Government of India for this research project (code: BT/PR3339/AGR/5/558/2011) is gratefully acknowledged. The authors thank Dr. Y. Lalitha for the cultures of C. cephalonica and T. chilonis 15 °C strains. We extend our gratitude towards the editor and three anonymous reviewers of the journal, who helped us to improve our manuscript greatly.

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  1. ICAR- National Bureau of Agricultural Insect Resources, P. Bag No. 2491, H.A Farm post, Bellary Road, Bangalore 24, India

    Enakshi Ghosh & Chandish R. Ballal

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  1. Enakshi Ghosh
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  2. Chandish R. Ballal
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Correspondence to Enakshi Ghosh.

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Ghosh, E., Ballal, C.R. Maternal influence on diapause induction: an approach to improve long-term storage of Trichogramma chilonis. Phytoparasitica 46, 383–389 (2018). https://doi.org/10.1007/s12600-018-0665-7

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