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Emergence Response of Telenomus podisi (Hymenoptera: Scelionidae) to Field Temperature Originated from Colonies Reared at Different Temperature Regimes

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Abstract

We studied the impact of field temperature on the emergence of Telenomus podisi Ashmead (Hymenoptera: Scelionidae) after being released as either protected (encapsulated) or unprotected pupae close to adult emergence. Two independent bioassays (protected pupae vs. unprotected pupae) were carried out in a randomized block experimental design in a 2 (parasitoid rearing temperature regimes) ×4 (release positions within plant canopy) factorial scheme. One of the T. podisi colonies was reared at a constant temperature (25 °C) and 12:12 h L:D (Light: Dark) photoperiod. The second T. podisi colony was reared at fluctuating temperatures (20 °C during 12 h D and 30 °C during 12 h of L). Each bioassay had five replicates. Each replicate contained 40 pupae from each rearing temperature and release position within plant canopy. Parasitoid pupae were released in the bottom third, middle third, or upper third of the plant’s canopy, as well as between planting lines. Each bioassay was repeated six times (in different plant developmental stages: R1, R2, R3, R4, R5 and R6). There was no difference in emergence of parasitoids between colonies reared at different temperatures after exposure to field conditions. Emergence of T. podisi was reduced after pupae exposure to temperatures above 35 °C in the field, regardless of the rearing temperature. Telenomus podisi tolerates temperature fluctuations for emergence as long as they fit the optimal range (20 to 30 °C).

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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors thank Embrapa Soja, the Coordination for the Improvement of Higher Education Personnel (CAPES), and the National Council for Scientific and Technological Development (CNPq) for their financial support. Thanks are also extended to Dr Valmir Antônio Costa (Instituto Biológico de Campinas) for parasitoid identification and to Adair Vicente Carneiro (Embrapa Soja) for drawing Figure 1.

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FC Colombo and AF Bueno contributed to the study design. FC Colombo and RMA Maciel conducted the sampling. FC Colombo and M Deniz realized the statistical analysis. FC Colombo, RMA Maciel, PMOJ Neves and AF Bueno wrote the paper. All authors have read and approved the manuscript.

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Correspondence to Adeney de Freitas Bueno.

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The authors declare no conflicts of interest associated with this publication.

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Colombo, F.C., Maciel, R.M.A., Deniz, M. et al. Emergence Response of Telenomus podisi (Hymenoptera: Scelionidae) to Field Temperature Originated from Colonies Reared at Different Temperature Regimes. Neotrop Entomol 52, 493–499 (2023). https://doi.org/10.1007/s13744-023-01035-3

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  • DOI: https://doi.org/10.1007/s13744-023-01035-3

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