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Substrate-mediated feeding and egg-laying by spotted wing drosophila: waveform recognition and quantification via electropenetrography

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Abstract

Substrate suitability is a key determinant of feeding and egg-laying decisions by arthropods and rigorous observation of such activities provides important management insight. Electropenetrography (EPG) was used to analyze feeding and egg-laying by the spotted wing drosophila (Drosophila suzukii (Matsumura)) on artificial diet and strawberry fruits. Three behavioral phases were recognized on both substrates: non-probing, feeding, and egg-laying. The non-probing phase encompassed a family of waveforms consisting of resting (coded as Z), grooming (G), and walking (W). The feeding phase encompassed waveforms representing substrate dabbing (D) and ingestion (I), while the egg-laying phase encompassed abdominal probing (P) and egg-laying (L) per se. The egg-laying phase was similar on diet and strawberry. In contrast, non-probing events were more frequent, but shorter, leading to less overall non-probing on diet compared with strawberry. Dabbing was more frequent and lasted longer overall on diet, but ingestion events lasted longer on strawberry. Therefore, although the flies fed (dabbed and ingested) for longer overall on diet, each ingestion event was longer on strawberries. Our results suggest that strawberry fruits are a more suitable and preferred food source because they led to extended periods of sustained ingestion. These findings demonstrate the first application of EPG for characterizing substrate-specific feeding and egg-laying behaviors of a key phytophagous pest, offering intriguing insight into management as well as host selection behaviors.

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Acknowledgements

Financial support was provided by the CAPES Foundation (Brazilian Ministry of Education), and USDA-ARS, which was greatly appreciated. The research was supported in part by an appointment to the Agricultural Research Service (ARS) Research Participation Program administered by the Oak Ridge Institute for Science and Education (ORISE) through an interagency agreement between the U.S. Department of Energy (DOE) and the U.S. Department of Agriculture (USDA). ORISE is managed by ORAU under DOE contract number DE-SC0014664. All opinions expressed in this paper are the authors’ and do not necessarily reflect the policies and views of CAPES, USDA, ARS, DOE, or ORAU/ORISE. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture. USDA is an equal opportunity provider and employer.

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Correspondence to Raul Narciso C. Guedes.

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All applicable international, national, and institutional guidelines for the care and use of animals were considered in the present study.

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The authors of this manuscript accept that the paper is submitted for publication in the Journal of Pest Science and report that this paper has not been published or accepted for publication in another journal, nor is under consider at another journal.

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Communicated by A. Biondi.

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Guedes, R.N.C., Cervantes, F.A., Backus, E.A. et al. Substrate-mediated feeding and egg-laying by spotted wing drosophila: waveform recognition and quantification via electropenetrography. J Pest Sci 92, 495–507 (2019). https://doi.org/10.1007/s10340-018-1065-y

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  • DOI: https://doi.org/10.1007/s10340-018-1065-y

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