Tratamento de sementes com produtos fitossanitários e biológicos no controle Fusarium tucumaniae agente causal da podridão vermelha da raiz em soja
Soybeam is the world's leading agricultural commodity, it has expanded due to its adaptability and use of technologies ranging from sowing to harvesting. Concomitantly, there was an increase in the number of phytopathogens that affect it. Seeds are the main vehicle for their transport and trans...
| Autor principal: | Manteli, Claudia |
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| Formato: | Tese |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/4732 |
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| Resumo: |
Soybeam is the world's leading agricultural commodity, it has expanded due to its adaptability and use of technologies ranging from sowing to harvesting. Concomitantly, there was an increase in the number of phytopathogens that affect it. Seeds are the main vehicle for their transport and transmission. Among these, Fusariumtucumaniae, one of the causal agents of red root rot, has high severity and difficult control. For its control, it is recommended to treat seeds with fungicides. Inoculation of seeds with biological agents, mainly of the genera Bradyrhizobiumand Azospirillum, is recommended, focusing on sustainability and productivity; Trichodermaspp. it is a potential biological agent for the control of plant pathogens. Thus, the question of the possibility of tri inoculation (Bradyrhizobium+ Azospirillum+ Trichoderma), as well as the compatibility between the phytosanitary treatments used in the seeds, with these three biological agents was investigated. Of soybean, aiming at the control of F. tucumaniae, causal agent of sudden death syndrome, from the application of phytosanitary and biological products, associated or not. Four trials were performed, all with a completely randomized design, using thephytosanitary products: Imidacloprido -Tiodicarb + Carbendazim -Tiram; Piraclostrobin -Methyl Thiophanate -Fipronil; Bifentrin -Imidacloprid + Methyl Thiophanate -Fluazinam; Tiametoxam + Metalaxyl-M -Fludioxonil and Biological B. japonicum, A. brasilenseand T. harzianum. In vitro, the minimum inhibitory dose between the phytosanitary and biological products and F. tucumaniaewas tested. In a second stage, the mycelial growth of F. tucumaniaein vitro was evaluated by applying phytosanitary and biological products, associated or not. The third study analyzed the physiological and sanitary quality of soybean seeds after F. tucumaniaeinfestation and treatments with phytosanitary and biological products, associated or not. In greenhouse, the treatment of seeds with phytosanitary and biological products in the transmission of F. tucumaniaeto soybean plants was analyzed. It was concluded that the phytosanitary products tested inhibit the growth of biological agents B. japonicum, A. brasilenseand T. harzianumand the minimum inhibitory dose for F. tucumaniae, is using the active ingredients, being an important factor in the decision choice of the active for seed treatment.The effect of biological agents isolated or associated with chemical phytosanitary have specificities in the control of F. tucumaniae, where the isolated or associated use of T. harzianumshowed greater potential in the control of F. tucumaniae. Untreated seeds had reduced viability. Phytosanitary products have no effect on soybean seed viability. Phytosanitary products have an effect on soybean seed vigor. Chemical or biological seed treatment reduces the incidence of sudden death syndrome when compared to non-seed treatment. However, such associations have particularities that deserve to be further explored for a recommendation on seed treatment or use in soybean furrows. |
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