Efeito da temperatura e de fungicidas na epidemia da mancha-amarela do trigo e no rendimento de grãos
Αποθηκεύτηκε σε:
| Κύριος συγγραφέας: | |
|---|---|
| Ημερομηνία έκδοσης: | 2015 |
| Μορφή: | Doctoral thesis |
| Γλώσσα: | por |
| Πηγή: | Repositório Institucional da UPF |
| Download full: | https://repositorio.upf.br/handle/123456789/9240 |
Περίληψη: | The culture of wheat has great importance for Brazil and Rio Grande do Sul Nevertheless, various diseases limit the crop yield in some crops. In no-tillage system, the tan spot caused by Pyrenophor tritici-repentis fungus, anamorphic form Drechslera tritici-repentis cause significant damage to the wheat crop. One epidemic of components, which makes the control of the tan spot, is the expansion of lesions for the production of toxins of the fungus in the plant tissues. In order to learn more about the epidemiology of the disease and improve their management there were conducted researches at UPF, from 2012 to 2014. Initially, wheat plants of Fundacep cultivars Horizonte and or Mirante, inoculated with D. tritici-repentis were subjected to temperatures of 10, 15, 20, 25 and 30 °C and assessed for lesion growth rate and severity. High temperatures (30 °C) caused the highest number, severity and increase of lesions. Then, conidia plates containing agar medium were incubated at the temperatures 0, 5, 10, 15, 20, 25, 30, 35 and 40°C, for 3, 6, 9 and 12 hours for germination evaluation. The maximum germination was obtained at a temperature of 19 ºC and time of 10.6 hours exposure. In order to sporulation, the leaf disks with disease symptoms were incubated in a humid chamber at temperatures of 10, 15, 20, 25 and 30 °C. The highest production of conidia was at 14 °C. In another study, fungicides: propiconazole 125 grams of active ingredient per hectare (g.i.a/ha), azoxystrobin (75 g.i.a/ha), propiconazole + azoxystrobin (125 + 75 g.i.a/ha) and fluxapyroxad + pyraclostrobin (50.1 + 99 9 g.i.a/ha) there were applied 1, 5 and 10 days after inoculation in the cultivars Fundacep Horizonte, Quartz and Iguaçu. In another one, the same fungicides were applied the same 1, 5 and 10 days before inoculation. The propiconazole fungicide showed better efficacy in controlling the tan spot and isolated strobilurin was the least contributed in control. After the fungicide propiconazole (25 g.i.a/ha), azoxystrobin (75 g.i.a/ha) and azoxystrobin + mixture benzovindiflupyr (90 + 45 g.i.a/ha) there were applied in each third of the leaf (lower, medium or higher part) to evaluate the movement of these elements and disease control. The number and size of lesions in the applied third was lower in treatments with propiconazole and azoxystrobin + benzovindiflupyr; only the treatment with propiconazole controlled the tan spot at the site where it was applied and on top of this. Finally, different cultivars were subjected to defoliation levels (flag leaf, two or three leaves above) and the thousand grain weight measured after harvest. Defoliation negatively affected the PMG. As we increased the number of removed leaves from the plant it was decreased the weight of a thousand grains |
| _version_ | 1871607616972521472 |
|---|---|
| author | Ranzi, Camila |
| author_browse | Ranzi, Camila |
| author_facet | Ranzi, Camila |
| author_role | author |
| collection | Repositório Institucional da UPF |
| dc.contributor.author.fl_str_mv | Ranzi, Camila |
| dc.contributor.none.fl_str_mv | Forcelini, Carlos Alberto http://lattes.cnpq.br/0881524391511473 |
| dc.date.none.fl_str_mv | 2015-04-10 2025-06-20T16:41:44Z |
| dc.format.none.fl_str_mv | application/pdf application/pdf |
| dc.identifier.uri.fl_str_mv | RANZI, Camila. Efeito da temperatura e de fungicidas na epidemia da mancha-amarela do trigo e no rendimento de grãos. 2015. 133 f. Tese (Doutorado em Agronomia) - Universidade de Passo Fundo, Passo Fundo, 2015. https://repositorio.upf.br/handle/123456789/9240 |
| dc.language.iso.fl_str_mv | por |
| dc.publisher.none.fl_str_mv | Universidade de Passo Fundo Faculdade de Agronomia e Medicina Veterinária – FAMV BR UPF Programa de Pós-Graduação em Agronomia |
| dc.rights.driver.fl_str_mv | info:eu-repo/semantics/openAccess |
| dc.source.none.fl_str_mv | reponame:Repositório Institucional da UPF instname:Universidade de Passo Fundo (UPF) instacron:UPF |
| dc.subject.por.fl_str_mv | Agronomia Grãos - Doenças e pragas Trigo - Pragas agrícolas - Controle Fitopatologia Agronomy Grains - Diseases and pests Wheat - Agricultural Pests - Control Phytopathology CNPQ::CIENCIAS AGRARIAS::AGRONOMIA |
| dc.title.none.fl_str_mv | Efeito da temperatura e de fungicidas na epidemia da mancha-amarela do trigo e no rendimento de grãos Effect of temperature and fungicides on epidemic tan spot in wheat and in the yield of grains |
| dc.type.driver.fl_str_mv | info:eu-repo/semantics/doctoralThesis |
| dc.type.status.fl_str_mv | info:eu-repo/semantics/publishedVersion |
| description | The culture of wheat has great importance for Brazil and Rio Grande do Sul Nevertheless, various diseases limit the crop yield in some crops. In no-tillage system, the tan spot caused by Pyrenophor tritici-repentis fungus, anamorphic form Drechslera tritici-repentis cause significant damage to the wheat crop. One epidemic of components, which makes the control of the tan spot, is the expansion of lesions for the production of toxins of the fungus in the plant tissues. In order to learn more about the epidemiology of the disease and improve their management there were conducted researches at UPF, from 2012 to 2014. Initially, wheat plants of Fundacep cultivars Horizonte and or Mirante, inoculated with D. tritici-repentis were subjected to temperatures of 10, 15, 20, 25 and 30 °C and assessed for lesion growth rate and severity. High temperatures (30 °C) caused the highest number, severity and increase of lesions. Then, conidia plates containing agar medium were incubated at the temperatures 0, 5, 10, 15, 20, 25, 30, 35 and 40°C, for 3, 6, 9 and 12 hours for germination evaluation. The maximum germination was obtained at a temperature of 19 ºC and time of 10.6 hours exposure. In order to sporulation, the leaf disks with disease symptoms were incubated in a humid chamber at temperatures of 10, 15, 20, 25 and 30 °C. The highest production of conidia was at 14 °C. In another study, fungicides: propiconazole 125 grams of active ingredient per hectare (g.i.a/ha), azoxystrobin (75 g.i.a/ha), propiconazole + azoxystrobin (125 + 75 g.i.a/ha) and fluxapyroxad + pyraclostrobin (50.1 + 99 9 g.i.a/ha) there were applied 1, 5 and 10 days after inoculation in the cultivars Fundacep Horizonte, Quartz and Iguaçu. In another one, the same fungicides were applied the same 1, 5 and 10 days before inoculation. The propiconazole fungicide showed better efficacy in controlling the tan spot and isolated strobilurin was the least contributed in control. After the fungicide propiconazole (25 g.i.a/ha), azoxystrobin (75 g.i.a/ha) and azoxystrobin + mixture benzovindiflupyr (90 + 45 g.i.a/ha) there were applied in each third of the leaf (lower, medium or higher part) to evaluate the movement of these elements and disease control. The number and size of lesions in the applied third was lower in treatments with propiconazole and azoxystrobin + benzovindiflupyr; only the treatment with propiconazole controlled the tan spot at the site where it was applied and on top of this. Finally, different cultivars were subjected to defoliation levels (flag leaf, two or three leaves above) and the thousand grain weight measured after harvest. Defoliation negatively affected the PMG. As we increased the number of removed leaves from the plant it was decreased the weight of a thousand grains |
| eu_rights_str_mv | openAccess |
| format | doctoralThesis |
| id | UPF_1ef94ece47d4c05fd253d82d5d8dfe4b |
| identifier_str_mv | RANZI, Camila. Efeito da temperatura e de fungicidas na epidemia da mancha-amarela do trigo e no rendimento de grãos. 2015. 133 f. Tese (Doutorado em Agronomia) - Universidade de Passo Fundo, Passo Fundo, 2015. |
| instacron_str | UPF |
| institution | UPF |
| instname_str | Universidade de Passo Fundo (UPF) |
| language | por |
| network_acronym_str | UPF |
| network_name_str | Repositório Institucional da UPF |
| oai_identifier_str | oai:repositorio.upf.br:123456789/9240 |
| publishDate | 2015 |
| publishDateSort | 2015 |
| publisher.none.fl_str_mv | Universidade de Passo Fundo Faculdade de Agronomia e Medicina Veterinária – FAMV BR UPF Programa de Pós-Graduação em Agronomia |
| reponame_str | Repositório Institucional da UPF |
| repository.mail.fl_str_mv | jucelei@upf.br||biblio@upf.br |
| repository.name.fl_str_mv | Repositório Institucional da UPF - Universidade de Passo Fundo (UPF) |
| repository_id_str | 1610 |
| spelling | Efeito da temperatura e de fungicidas na epidemia da mancha-amarela do trigo e no rendimento de grãosEffect of temperature and fungicides on epidemic tan spot in wheat and in the yield of grainsAgronomiaGrãos - Doenças e pragasTrigo - Pragas agrícolas - ControleFitopatologiaAgronomyGrains - Diseases and pestsWheat - Agricultural Pests - ControlPhytopathologyCNPQ::CIENCIAS AGRARIAS::AGRONOMIAThe culture of wheat has great importance for Brazil and Rio Grande do Sul Nevertheless, various diseases limit the crop yield in some crops. In no-tillage system, the tan spot caused by Pyrenophor tritici-repentis fungus, anamorphic form Drechslera tritici-repentis cause significant damage to the wheat crop. One epidemic of components, which makes the control of the tan spot, is the expansion of lesions for the production of toxins of the fungus in the plant tissues. In order to learn more about the epidemiology of the disease and improve their management there were conducted researches at UPF, from 2012 to 2014. Initially, wheat plants of Fundacep cultivars Horizonte and or Mirante, inoculated with D. tritici-repentis were subjected to temperatures of 10, 15, 20, 25 and 30 °C and assessed for lesion growth rate and severity. High temperatures (30 °C) caused the highest number, severity and increase of lesions. Then, conidia plates containing agar medium were incubated at the temperatures 0, 5, 10, 15, 20, 25, 30, 35 and 40°C, for 3, 6, 9 and 12 hours for germination evaluation. The maximum germination was obtained at a temperature of 19 ºC and time of 10.6 hours exposure. In order to sporulation, the leaf disks with disease symptoms were incubated in a humid chamber at temperatures of 10, 15, 20, 25 and 30 °C. The highest production of conidia was at 14 °C. In another study, fungicides: propiconazole 125 grams of active ingredient per hectare (g.i.a/ha), azoxystrobin (75 g.i.a/ha), propiconazole + azoxystrobin (125 + 75 g.i.a/ha) and fluxapyroxad + pyraclostrobin (50.1 + 99 9 g.i.a/ha) there were applied 1, 5 and 10 days after inoculation in the cultivars Fundacep Horizonte, Quartz and Iguaçu. In another one, the same fungicides were applied the same 1, 5 and 10 days before inoculation. The propiconazole fungicide showed better efficacy in controlling the tan spot and isolated strobilurin was the least contributed in control. After the fungicide propiconazole (25 g.i.a/ha), azoxystrobin (75 g.i.a/ha) and azoxystrobin + mixture benzovindiflupyr (90 + 45 g.i.a/ha) there were applied in each third of the leaf (lower, medium or higher part) to evaluate the movement of these elements and disease control. The number and size of lesions in the applied third was lower in treatments with propiconazole and azoxystrobin + benzovindiflupyr; only the treatment with propiconazole controlled the tan spot at the site where it was applied and on top of this. Finally, different cultivars were subjected to defoliation levels (flag leaf, two or three leaves above) and the thousand grain weight measured after harvest. Defoliation negatively affected the PMG. As we increased the number of removed leaves from the plant it was decreased the weight of a thousand grainsA cultura do trigo tem grande importância para o Brasil e o Rio Grande do Sul. Contudo, diversas doenças limitam a produtividade da cultura em algumas safras. No sistema de plantio direto, a mancha-amarela, causada pelo fungo Pyrenophora tritici-repentis, forma anamórfica Drechslera tritici-repentis, causa danos significativos à cultura do trigo. Um dos componentes da epidemia, que dificulta o controle da mancha-amarela é a expansão das lesões pela produção de toxinas do fungo nos tecidos da planta. Para conhecer melhor a epidemiologia da doença e aprimorar o seu manejo foram conduzidas pesquisas na UPF, de 2012 a 2014. Inicialmente, plantas de trigo dos cultivares Fundacep Horizonte e OR Mirante, inoculadas com D. tritici repentis, foram submetidas a temperaturas de 10, 15, 20, 25 e 30 oC e avaliadas quanto a taxa de expansão da lesão e severidade. As temperaturas mais altas (30 °C) promoveram maior número, severidade e aumento de lesões. Após, placas contendo conídios em meio ágar-água foram incubadas nas temperaturas 0, 5, 10, 15, 20, 25, 30, 35 e 40 ºC, por 3, 6, 9 e 12 horas, para avaliação da germinação. A germinação máxima estimada foi obtida na temperatura de 19 ºC e tempo de exposição de 10,6 horas. Para esporulação, discos de folhas com sintomas da doença foram incubadas em câmara úmida sob as temperaturas de 10, 15, 20, 25 e 30 ºC. A maior produção de conídios foi na temperatura de 14°C. Em outro trabalho, os fungicidas: propiconazol 125 gramas de ingrediente ativo por hectare (g.i.a/ha), azoxistrobina (75 g.i.a/ha), propiconazol + azoxistrobina (125 + 75 g.i.a/ha) e fluxapiroxade + piraclostrobina (50,1 + 99,9 g.i.a/ha), foram aplicados 1, 5 e 10 dias após a inoculação nos cultivares Fundacep Horizonte, Quartzo e Iguaçú. Em outro os mesmos fungicidas foram aplicados 1, 5 e 10 dias antes das inoculações. O fungicida propiconazol apresentou melhor eficácia no controle da mancha amarela e a estrobilurina isolada foi a que menos contribuiu no controle. Após os fungicidas propiconazol (25 g.i.a/ha), azoxistrobina (75 g.i.a/ha) e a mistura azoxistrobina + benzovindiflupir (90 + 45 g.i.a/ha) foram aplicados em cada terço da folha (inferior, médio ou superior) para avaliar a movimentação destes e o controle da doença. O número e tamanho de lesões no terço aplicado foram menor, nos tratamentos com propiconazol e azoxistrobina + benzovindiflupir; somente o tratamento com propiconazol controlou a mancha amarela no local onde foi aplicado e na parte superior a esta. Por fim, diferentes cultivares foram submetidos a níveis de desfolha (folha bandeira, duas ou três folhas superiores) e o peso de mil grãos medidos após a colheita. A desfolha influenciou negativamente o PMG. A medida que aumentou o número de folhas removidas da planta, diminuiu o peso de mil grãosUniversidade de Passo FundoFaculdade de Agronomia e Medicina Veterinária – FAMVBRUPFPrograma de Pós-Graduação em AgronomiaForcelini, Carlos Albertohttp://lattes.cnpq.br/0881524391511473Ranzi, Camila2025-06-20T16:41:44Z2015-04-10info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfapplication/pdfRANZI, Camila. Efeito da temperatura e de fungicidas na epidemia da mancha-amarela do trigo e no rendimento de grãos. 2015. 133 f. Tese (Doutorado em Agronomia) - Universidade de Passo Fundo, Passo Fundo, 2015.https://repositorio.upf.br/handle/123456789/9240porinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UPFinstname:Universidade de Passo Fundo (UPF)instacron:UPF2025-12-30T20:25:22Zoai:repositorio.upf.br:123456789/9240Repositório InstitucionalPRIhttp://repositorio.upf.br/oai/requestjucelei@upf.br||biblio@upf.bropendoar:16102025-12-30T20:25:22Repositório Institucional da UPF - Universidade de Passo Fundo (UPF) |
| spellingShingle | Efeito da temperatura e de fungicidas na epidemia da mancha-amarela do trigo e no rendimento de grãos Ranzi, Camila Agronomia Grãos - Doenças e pragas Trigo - Pragas agrícolas - Controle Fitopatologia Agronomy Grains - Diseases and pests Wheat - Agricultural Pests - Control Phytopathology CNPQ::CIENCIAS AGRARIAS::AGRONOMIA |
| status_str | publishedVersion |
| title | Efeito da temperatura e de fungicidas na epidemia da mancha-amarela do trigo e no rendimento de grãos |
| title_full | Efeito da temperatura e de fungicidas na epidemia da mancha-amarela do trigo e no rendimento de grãos |
| title_fullStr | Efeito da temperatura e de fungicidas na epidemia da mancha-amarela do trigo e no rendimento de grãos |
| title_full_unstemmed | Efeito da temperatura e de fungicidas na epidemia da mancha-amarela do trigo e no rendimento de grãos |
| title_short | Efeito da temperatura e de fungicidas na epidemia da mancha-amarela do trigo e no rendimento de grãos |
| title_sort | Efeito da temperatura e de fungicidas na epidemia da mancha-amarela do trigo e no rendimento de grãos |
| topic | Agronomia Grãos - Doenças e pragas Trigo - Pragas agrícolas - Controle Fitopatologia Agronomy Grains - Diseases and pests Wheat - Agricultural Pests - Control Phytopathology CNPQ::CIENCIAS AGRARIAS::AGRONOMIA |
| url | https://repositorio.upf.br/handle/123456789/9240 |