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Field-Based Thermal Need Research for Better Management of Phthorimaea operculella (Lepidoptera: Gelechiidae) and Its Damage on Five Potato Varieties

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Abstract

Potato tuber moth, Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae), is the most important pest of potato in fields and warehouses in the world. Planting resistant potato varieties along with efficient cultural management strategies such as re-hilling and planting cover plants at the end of the season and prior to tuber harvesting can significantly minimise potato tuber infestation. An effective strategy for integrated pest management (IPM) may involve using an accurate forecasting method based on daily degree units of pests to identify the precise time of pest treatment. The current study examined the thermal units (degree-days) of potato tuber moth, on five potato varieties in the Ardabil area (Ardabil, Iran) during the potato growing seasons of 2020 and 2021. Moreover, five potato varieties were evaluated for their relative resistance to potato tuber moth (PTM) damage. The findings showed that PTM successfully completed two generations during the cropping season in the Ardabil area. The thermal requirements of the egg stage did not differ significantly among the potato varieties investigated. Significant difference was observed in the larval development time and its thermal needs between the five different potato varieties. In both years, the larva’s thermal needs were clearly ranked in a descending order for Red Scarlet, Rona, Agria, Atousa, and Savalan varieties. The Red Scarlet variety had the lowest tuber infestation rate and the fewest larvae inside the tuber. Overall, the findings of this research can help with monitoring and forecasting P. operculella phenological occurrences, assisting in the timely implementation of management strategies in IPM programs.

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All authors contributed to the experiment’s concept and design. The subject of the research has been proposed by RZ and AG as supervisor. RZ carried out the experiments and prepared the original manuscript. AG contributed to editing, conceptualization, analysing, and interpretation of the data. SAAF contributed to supervision and interpretation of the data. BN and DH participated in data analysis and acted as advisors. All authors read and approved the manuscript.

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Correspondence to Ali Golizadeh.

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The data have not been published partially or completely in any other journal. This research is a part of PhD thesis of RZ.

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Zamani, R., Golizadeh, A., Fathi, S.A.A. et al. Field-Based Thermal Need Research for Better Management of Phthorimaea operculella (Lepidoptera: Gelechiidae) and Its Damage on Five Potato Varieties. Potato Res. 67, 479–493 (2024). https://doi.org/10.1007/s11540-023-09651-7

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  • DOI: https://doi.org/10.1007/s11540-023-09651-7

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