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Use of satellite images to monitor Leucoptera sinuella leaf damage in poplar plantations in central Chile

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Abstract

The invasive poplar leaf miner Leucoptera sinuella (Lepidoptera: Lyonetiidae), has spread throughout poplar plantations in central Chile. We developed and validated models based on two methodologies of foliar damage estimation, and from different bands and indexes obtained from Sentinel-2 satellite images. We estimated foliar damage with field visual application of an ordinal severity scale, or with a laboratory estimation of leaf mined area with an image software (ImageJ) from a sample of leaves using an ordinal severity scale. We developed four models for the visual estimation on the field using red band and three spectral indexes, while we developed four models for the laboratory image software estimation using near infrared (NIR) band and the same three spectral indexes. Models developed from field visual estimation with red band (R2 = 0.88) and Normalized Difference Vegetation Index (NDVI) (R2 = 0.89) produced better results, as well as from image software estimation with NIR band (R2 = 0.86) and NDVI (R2 = 0.83). The field visual estimation and red band model got the best validation results, with R2 of 0.90, mean square error of 0.73, mean absolute error of 0.59, and a slope of 0.91. This model could predict the severity of foliar damage by L. sinuella in poplar plantations, representing a potentially useful monitoring tool for decision-making in the management of the poplar leaf miner in large areas of poplar plantations in central Chile.

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Acknowledgements

This project was funded by Fondo de Innovación para la Competitividad de la Región de O´Higgins (FIC-O’Higgins grant IDI 40008896-0) and the National Research and Development Agency in Chile (ANID) project number 7819I320003. This research could be carried out thanks to the support of the Compañía Agrícola y Forestal el Álamo (CAF), who provided everything necessary to correctly carry out the measurements.

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Contributions

P.C: Conceived the ideas and designed methodology, Did the model development and validation, Writing of the manuscript. D.F: Review and editing. S.Y: Collected the data, Review and editing. J. G: Collected the data, Review and editing. J.V: Conceptualization, Funding acquisition, Review and editing. F.Z: Conceptualization, Funding acquisition, Review and editing. C.E: Funding acquisition, Review and editing. J.U: Collected the data, Review and editing. E.F: Conceptualization, Writing of the manuscript, Funding acquisition.

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Correspondence to Paulo Cañete-Salinas.

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Cañete-Salinas, P., de la Fuente-Sáiz, D., Yánez-Segovia, S. et al. Use of satellite images to monitor Leucoptera sinuella leaf damage in poplar plantations in central Chile. New Forests (2024). https://doi.org/10.1007/s11056-024-10029-x

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  • DOI: https://doi.org/10.1007/s11056-024-10029-x

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