Abstract
Tan spot, caused by the necrotrophic fungus Pyrenophora tritici-repentis, is an economically serious disease worldwide. However, little has been learned about the importance of this disease in Tunisia. This study was carried out to determine the distribution of tan spot in nine districts of Northern Tunisia and to assess its prevalence, incidence and severity according to the prospected districts and the most cultivated varieties. Surveys of 414 wheat fields were conducted in 2016, 2017 and 2018. Tan spot was detected in all prospected districts with a frequency of 37%, 64% and 89% in 2016, 2017 and 2018, respectively. Based on prevalence, incidence and severity data, the disease was especially important in Manouba and Zaghouan in 2016, in Bizerte, Ariana, Jendouba, Siliana and El Kef in 2017, and in all visited districts except for Siliana in 2018. It was more serious on durum than on bread wheat. The commercial durum wheat varieties ‘Maali’, ‘Karim’ and ‘Razzak’ were the most grown in Northern districts. ‘Maali’ was the most susceptible during the three years, while ‘Karim’ and ‘Razzak’ showed susceptible reaction only during two years; 2016 and 2017 for the first and 2017 and 2018 for the second. The recently introduced cultivars ‘Carioca’ and ‘Monastir’ and the bread wheat varieties ‘Utique’ and ‘Haidra’ were less susceptible than old improved durum wheat varieties. These findings are useful to farmers to choose most tolerant varieties in their growing area.
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We are thankful to the Regional Commissary for Agricultural Development for their help in planning the field surveys with farmers.
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The research was supported by the federated project untitled “Identification of durum wheat resistant genotypes to biotic and drought stress and their valorization for sustainable agriculture” (RESIDUR), supported by the Institution of Agricultural Research and Higher Education (IRESA) under the Tunisian Ministry of Agriculture.
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S.K and M.C conceived the work. S.K performed the work and drafted the manuscript. M.C revised and edited the manuscript.
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Kamel, S., Cherif, M. Tan spot of wheat in Northern Tunisia: distribution, prevalence, incidence and severity. CEREAL RESEARCH COMMUNICATIONS 49, 421–432 (2021). https://doi.org/10.1007/s42976-020-00120-2
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DOI: https://doi.org/10.1007/s42976-020-00120-2