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Determining agro-climatic favourability zones for coffee leaf rust in Brazil – a new approach for assisting crop risk planning

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Abstract

Coffee leaf rust (CLR) poses a significant threat to coffee crops worldwide, including those grown in Brazil. CLR thrives in climatic conditions ideal for coffee cultivation, which results in its constant presence in Brazilian coffee farms. The intensity of CLR exhibits variations as affected by interannual and spatial climate variability that shape epidemics. The aim of this study was to determine the agro-climatic favourability zones for CLR occurrence in the major coffee-producing regions of Brazil based on region-specific agro-climatic conditions. Climate data spanning from 1961 to 2015 at 46 sites were selected to represent the major coffee-producing regions. Using a CLR infection rate model, daily simulations were performed to calculate the cumulative infection rate (CIR) for each site and growing season, starting from 1st October to 30th June of the following year. Based on the CIR values, the sites and seasons were categorised into five favourability classes: Very Low, Low, Medium, High, and Very High. An Agro-Climatic Favourability index (ACFavindex) was developed, considering the frequency of seasons falling within each favourability class. A map displaying four distinct favourability zones across the studied regions was then obtained and showed that most of the traditional coffee-growing areas fell within the Medium to High Favourability zones for CLR. The obtained map, delineating CLR favourability zones, holds practical value for coffee growers, consultants, and policymakers alike. It can guide the selection of CLR-resistant coffee cultivars for new cultivation areas and aid in the development of effective disease control strategies.

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Source of data: IBGE (2018)

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Acknowledgements

The authors are grateful to the São Paulo Research Foundation (FAPESP, grants 2014/17781-8 and 2016/04773-2) for the funds that supported this project. The second author is thankful to the Brazilian Research and Development Council (CNPq) for his fellowship (Level 1 A). Authors express their gratitude for the reviewer’s suggestions, which contributed substantially to the improvement of the final version of this manuscript.

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Correspondence to Fernando Dill Hinnah.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Tribute

Paulo Cesar Sentelhas, co-author and supervisor of this research, sadly passed away on 21st September 2021, due to complications of COVID-19, one week before completing 57 years at full activity. Paulo Sentelhas was a global reference on research about how the weather determines plant disease development as well the weather interference on yield gaps. Performing manuscripts reviews, he helped to increase quality of several journals, with a main role as Editor in Chief of Scientia Agricola journal. Paulo was a terrific professor presenting capabilities to demonstrate with amazing draws and clear explanations about the agrometeorological science and its interaction with plants and key aspects of agricultural production, using his human and math skills in the best way. Motivating his alumni since the beginning to the end of their academic life, year after year was honoured at the ‘Luiz de Queiroz’ College of Agriculture graduation event. To his team of undergraduate and graduate students, Paulo opened the windows of knowledge, helping us to reach higher academic and professional levels. Although busy, Paulo had his agenda available at any time to guide the students’ steps. As father, Paulo left his wife Rosana, and three daughters, Bárbara, Isabella and Luana, showing his love by the family since the first time we talked. A retired volleyball player who always enjoyed playing pool volleyball with friends and family. There is a huge community of agronomists, researchers and professors thankful for the honour of meeting and learning with Paulo in the different aspects of professional and personal life. This is a short tribute to the great scientist and person Paulo Sentelhas was.

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In memoriam Paulo Cesar Sentelhas

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Hinnah, F.D., Sentelhas, P.C. & Dias, H.B. Determining agro-climatic favourability zones for coffee leaf rust in Brazil – a new approach for assisting crop risk planning. Australasian Plant Pathol. 52, 555–565 (2023). https://doi.org/10.1007/s13313-023-00942-8

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