Abstract
The species composition of the strawberry anthracnose pathogen population in Saga Prefecture was investigated through phylogenetic analysis of the nucleotide sequences of the intergenic regions of the apn2 and MAT1-2–1 genes. Here, 77 out of the 80 Colletotrichum isolates used were classified as C. fructicola, and the remaining three were classified as C. siamense. The 77 C. fructicola isolates were tested for sensitivity to fludioxonil, which is widely used as the main fungicide in rotational programs in Saga Prefecture. High levels of resistance to fludioxonil were observed in 14 C. fructicola isolates tested for sensitivity to mycelial growth in fludioxonil-containing media. Furthermore, two inoculation assays using strawberry seedlings treated with fludioxonil were performed on five of the 14 isolates that showed high levels of resistance. The effectiveness of fludioxonil was significantly low in these isolates. To our knowledge, this is the first study to report fludioxonil resistance in a C. fructicola population.
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AF and YI designed the study and the main conceptual ideas. MK developed the statistical analysis plan and conducted sequencing and phylogenic analyses. NT contributed to the interpretation of the results. AF wrote the original manuscript with support from YI and MK. YI and MK supervised this study. All authors reviewed the manuscript draft and revised it critically on intellectual content. All authors approved the final version of the manuscript to be published.
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10327_2024_1174_MOESM1_ESM.xlsx
Supplementary file1 Species identification of the Colletotrichum field isolates used in this study The effect of fludioxonil on the mycelial growth of Colletotrichum isolates collected from strawberries in Saga Prefecture (XLSX 24 KB) Supplementary file2 (XLSX 24 KB)
10327_2024_1174_MOESM4_ESM.pptx
Supplementary file4 The taxonomic status of Colletotrichum isolates from strawberry in Saga Prefecture, as inferred from phylogenetic analysis based on sequences of the intergenic region of apn2 and MAT1-2–1 (ApMat) (PPTX 53 KB)
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Furuta, A., Ide, Y., Tashiro, N. et al. First report of fludioxonil resistance isolate of Colletotrichum fructicola emerging on strawberry in Japan. J Gen Plant Pathol (2024). https://doi.org/10.1007/s10327-024-01174-4
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DOI: https://doi.org/10.1007/s10327-024-01174-4