Fungicide systemicity and blast control in wheat heads
DOI:
https://doi.org/10.5433/1679-0359.2025v46n2p567Keywords:
Pyricularia oryzae, Triticum aestivum, Chemical severity control.Abstract
The chemical control of wheat blast, a disease caused by Pyricularia oryzae Triticum (PoT), is part of the integrated management of this disease. The aim of this study was to evaluate fungicide systemicity in wheat heads and its effect on blast control. BRS 264 cultivars were grown in pots until anthesis (Zadoks stage 65), after which two central spikelets were removed from each head, exposing the rachis, where fungicide solutions were applied. Seven fungicides were evaluated (Flutriafol, Tebuconazole, Propiconazole, Pydiflumetofen, Cyproconazole, Pyraclostrobin and Mancozeb), as well as the control treatment with no fungicides and only water applied. Twenty-four hours after the solution was applied, a conidial suspension (105 conidia mL-1) of PoT was sprayed on the heads and the plants were kept at 24 ºC, 90-95% relative humidity (RH) and in the dark for a further 24 hours. They were then kept at 24 ºC, 70-80% RH under a 12-hour photoperiod until disease severity on the heads was assessed 5, 7 and 11 days after inoculation (dai). Between 20 and 30 heads were evaluated per treatment. Severity above and below the treated area was assessed by the generalized beta regression model. Above the treated area, at 5 and 7 days, the treatments with Flutriafol, Tebuconazole, Propiconazole, Pydiflumetofen and Cyproconazole differed from Check, showing lower average blast severity. Mancozeb and Pyraclostrobin also showed lower disease severity compared to the Check treatment when the overall results were analyzed. The acropetal movement of fungicides should be considered along with other approaches to integrated wheat blast management.
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References
AGROFIT. Sistema de Agrotóxicos Fitossanitários. (2024). System of Phytosanitary Pesticides from the Ministry of Agriculture, Livestock and Supply/Ministério da Agricultura, Pecuária e Abastecimento (MAPA). http://extranet.agricultura.gov.br/agrofit_cons/principal_agrofit_cons
Albrecht, J. C. (2021). Cultivar Trigo BRS 264: precocidade, qualidade industrial e altos rendimentos para o cerrado do Brasil Central (Technical Circular, 49). Planaltina, DF: Embrapa Cerrados. https://ainfo.cnptia.embrapa.br/digital/bitstream/item/225213/1/Cultivar-trigo-BRS-264-Circular-tecnica-49.pdf
Allaire J. 2012. RStudio: integrated development environment for R. RStudio, Boston, MA. http://www.rstudio.com/
Amaro, A. C. E., Baron, D., Ono, E. O., & Rodrigues, J. D. (2020). Physiological effects of strobilurin and carboxamides on plants: an overview. Acta Physiologiae Plantarum, 42, 1-10. doi: 10.1007/s11738-019-2991-x
Bakade, R. R., Sundaresha, S., & Lal, M. (2022). Management strategies and alternatives for fungicidal resistance in potato. In Pesticides-Updates on Toxicity, Efficacy and Risk Assessment. IntechOpen. doi: 10.5772/intechopen.105539
Bartlett, D. W., Clough, J. M., Godwin, J. R., Hall, A. A., Hamer, M., & Parr‐Dobrzanski, B. (2002). The strobilurin fungicides. Pest Management Science: formerly Pesticide Science, 58(7), 649-662. doi: 10.1002/ps.520
Couch, B. C., & Kohn, L. M. (2002). A multilocus gene genealogy concordant with host preference indicates segregation of a new species, Magnaporthe oryzae, from M. grisea. Mycologia, 94(4), 683-693. doi: 10.1080/15572536.2003.11833196
Cruz, C. D., Santana, F. M., Todd, T. C., Maciel, J. L. N., Kiyuna, J., Baldelomar, D. F., Cruz, A. P., Lau, D., Seixas, C. S., Goulart, A. C. P., Sussel, A. A., Schipanski, C. A., Chagas, D. F., Coelho, M., Montecelli, T. D. N., Utiamada, C., Custódio, A. P., Rivadeneira, M. G., Bockus, W. W., & Valent, B. (2019). Multi-environment assessment of fungicide performance for managing wheat head blast (WHB) in Brazil and Bolivia. Tropical Plant Pathology, 44, 183-191. doi: 10.1007/s40858-018-0262-9
Cunha, G. R. da, & Caierão, E. (Orgs.). (2023). Informações técnicas para trigo e triticale, safra 2023: 15ª reunião da Comissão Brasileira de Pesquisa de Trigo e Triticale. Brasília: Embrapa. https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1153536/1/InformacoesTecnicasTrigoTriticale-Safra2023.pdf
FRAC. Fungicide Resistance Action Committee. (2024). Fungal control agents sorted by cross-resistance pattern and mode of action (including coding for FRAC Groups on product labels). https://www.frac.info/docs/default-source/publications/frac-code-list/frac-code-list-2024.pdf
Kohli, M. M., Mehta, Y. R., Guzman, E., Viedma, L. D., & Cubilla, L. E. (2011). Pyricularia blast-a threat to wheat cultivation. Czech Journal of Genetics and Plant Breeding, 47, S130-S134. https://www.agriculturejournals.cz/pdfs/cjg/2011/10/06.pdf
Lau, D., Sbalcheiro, C. C., Martins, F. C., Santana, F., Maciel, J. L. N., Fernandes, J. M. C., Costamilan, L. M., Lima, M. I. P. M., Kuhnem, P., & Casa, R. T. (2020). Principais doenças do trigo no sul do Brasil: diagnóstico e manejo (Online Technical Announcement, 375). Passo Fundo, RS: Embrapa Trigo. https://ainfo.cnptia.embrapa.br/digital/bitstream/item/221150/1/ComTec-375-Online-2021.pdf
Liao, T.-Z., Chen, Y.-H., Tsai, J.-N., Chao, C., Huang, T.-P., Hong, C.-F., Wu, Z.-C., Tsai, I. J., Lee, H.-H., Klopfenstein, N. B., Kim, M.-S., Stewart, J. E., Atibalentja, N., Brooks, F. E., Cannon, P. G., Farid, A. M., Hattori, T., Kwan, H.-S., Lam, R. Y. C., ... & Chung, C-L. (2023). Translocation of fungicides and their efficacy in controlling Phellinus noxius, the cause of brown root rot disease. Plant Disease, 107(7), 2039-2053. doi: 10.1094/PDIS-06-22-1285-RE
Liu, X., Chen, X., Ding, X., & Wu, H. (2018). Uptake and distribution characteristics of the novel fungicide pyraoxystrobin in cucumber plants. RSC advances, 8(48), 27152-27156. doi: 10.1039/C8RA05140B
Maciel, J. L. N., Santos, G. B. D., Pizolotto, C. A., Kovaleski, M., Silva, A. N. D., Deuner, C. C., & Costa, I. F. D. D. (2022). Resistance of Brazilian wheat cultivars to blast under controlled condition. Ciência Rural, 52, e20210417. doi: 10.1590/0103-8478cr20210417
Oliver, R. P., & Beckerman, J. L. (2022). Fungicides in Practice. CABI, Wallingford, U.K.
Perkins, D. D. (1962). Preservation of Neurospora stock cultures with anhydrous silica gel. Canadian Journal of Microbiology, 8(4), 591-594. doi: 10.1139/m62-078
Rocha, J. R. D. A. S. D. C., Pimentel, A. J. B., Ribeiro, G., & Souza, M. A. D. (2014). Eficiência de fungicidas no controle da brusone em trigo. Summa Phytopathologica, 40, 347-352. doi: 10.1590/0100-5405/1937
Sussel, A. A. B., Dianese, A. C., Chagas, J. H., & Santana, F. M. (2021) Eficiência do Manejo Químico da Brusone em Trigo Tropical em Planaltina, Distrito Federal. (Research and Development Bulletin, 386). Planaltina, DF: Embrapa Cerrados. https://ainfo.cnptia.embrapa.br/digital/bitstream/item/232117/1/Bolpd-386.pdf
Van der Plank, J. E. (1963). Plant diseases: epidemics and control. Elsevier Academic Press, New York, USA.
Vicentini, S. N. C., Casado, P. S., Carvalho, G. de, Moreira, S. I., Dorigan, A. F., Silva, T. C., Silva, A. G., Custódio, A. A. P., Gomes, A. C. S., Maciel, J. L. N., Hawkins, N., McDonald, B. A., Fraaije, B. A., & Ceresini, P. C. (2021). Monitoring of Brazilian wheat blast field populations reveals resistance to QoI, DMI, and SDHI fungicides. Plant Pathology, 71(2), 304-321. doi: 10.1111/ppa.13470
Zadoks, J. C., Chang, T. T., & Konzak, C. F. (1974). A decimal code for the growth stages of cereals. Weed research, 14(6), 415-421. doi: 10.1111/j.1365-3180.1974.tb01084.x
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Copyright (c) 2025 Daniela da Silva, Marcos Kovaleski, Cláudia Cristina Clebsch, Mateus Mossolin, Carolina Cardoso Deuner, João Leodato Nunes Maciel

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