The induction of resistance is an important strategy in integrated plant disease management. This strategy has a great potential to be adopted by farmers, motivated by the worldwide demand for a reduced pesticide use in food production. Studies have shown that resistance inducers are effective against a wide variety of pathogens, including Phakopsora pachyrhizi, the causal agent of Asian soybean rust. This review aims to synthesize current knowledge on the use of induced resistance for soybean rust management. Special emphasis is placed on commercially available products and potential resistance inducers described in the literature. Finally, perspectives and challenges regarding the use of resistance inducers for soybean rust management are highlighted.
O fungo Diplodia macrospora é agente causal de doenças na cultura do milho, sendo responsável por diminuição da produção. Entre inúmeras formas de controle de doenças pode-se citar a utilização de extratos vegetais. Diante disto, o objetivo deste estudo foi verificar a ação do extrato de guaco, orégano, arruda, gengibre, penicilina, pulmonária, alecrim, eucalipto, romã e osmarin, contra D. macrospora. O ensaio foi realizado em delineamento interiramente casualisado sendo utilizado para cada extrato as concentrações 0%, 1%, 2,5%, 5%, 7,5% e 10%. Os extratos foram obtidos pela trituração de parte do vegetal com água sendo o extrato bruto aquoso resultante utilizado na confecção dos meios de cultura. Realizou-se a avaliação do crescimento micelial a cada 24 horas, calculou-se a área abaixo da curva de progresso do crescimento micelial (AACCM) e realizada uma análise de regressão para cada extrato. Os extratos de guaco, orégano, arruda, gengibre, penicilina, pulmonária, alecrim, eucalipto, romã e osmarin, proporcionaram redução de aproximadamente 60, 85, 80, 55, 35, 42, 53, 89, 87 e 23% no crescimento micelial, sendo possível concluir que houve efeito positivo dos extratos contra o fungo D. macrospora.
Brazil is one of the world's largest producers of sugarcane. Studies considering the production of a culture in informatic function of time allow to verify the behavior of it in a certain homologated. The aims of this work were to analyze the production of the states of Paraná, São Paulo and Minas Gerais, as well as the national production of sugarcane crops, based on statistical tools of regression analysis, and correlation. Sugar cane production data were collected from the Sugarcane Industry Union (UNICA). The work was done in the State University of Western Paraná, Post-Graduation in Agronomy, between July 2018 and December 2018. The data used were obtained from various institutions and, made available by the Sugarcane Industry Union (UNICA), constituting a historical series of 1980/81 to 2016/17. The regression models that best fit the states of Paraná and São Paulo were the linear model, with correlation equal to 0.9711 and 0.9934 respectively, while for Minas Gerais was the quadratic, with 0.9708 of correlation with the national production. The results obtained showed a greater similarity of the behavior of the production of São Paulo with the national, evidencing its importance in participating in the sugarcane agroindustry sector. Based on the regression and correlation analyses obtained, it was found that the state of Paraná and São Paulo obtained a behavior of sugarcane production like that of the national. In the sugarcane production of the state of Minas Gerais, the growth was observed only from the year 2000. Thus, it is concluded that the productions from the states of São Paulo and Paraná contributed more significantly to the national production of sugarcane in relation to the production of the state of Minas Gerais.
CIP) (eDOC BRASIL, Belo Horizonte/MG) P964 A produção do conhecimento nas ciências agrárias e ambientais 4 [recurso eletrônico] / Organizador Alan Mario Zuffo. -Ponta Grossa (PR): Atena Editora, 2019. -(A Produção do Conhecimento nas Ciências Agrárias e Ambientais; v. 4) Formato: PDF Requisitos de sistema: Adobe Acrobat Reader Modo de acesso: World Wide Web Inclui bibliografia
A banana apresenta elevada suscetibilidade a doenças como as podridões que diminuem o tempo de prateleira do fruto. Uma das formas de controlar as doenças seria a utilização de métodos alternativos como os extratos de plantas medicinais. Assim, o objetivo deste estudo foi verificar a ação de formulados de alecrim (Rosmarinus officinalis L.) pó e líquido no controle de antracnose causada pelo fungo Colletotrichum musae (Berk & Curt.) Von Arx. e na maturação de banana ‘Nanicão’ em pós-colheita. Foram utilizadas as concentrações 0%; 0,25%; 0,5%; 1%; 1,5% e 2% do pó solúvel de extrato de alecrim diluído em água destilada, e as concentrações 0%; 0,5%; 1%; 2%; 4% e 6% do formulado aquoso contendo 21% de resíduo seco de alecrim diluído em água destilada. Foi realizada a mensuração da área de cada fruto e avaliada a severidade e a maturação a partir de porcentagem de área dos frutos, sendo os resultados utilizados para calcular a área abaixo da curva de progresso da doença (AACPD) e a porcentagem de maturação dos frutos. Realizou-se analise de regressão a partir dos dados obtidos e pode-se verificar que para o formulado de alecrim em pó a AACPD reduziu mais de 29% e para a maturação a redução foi de 21,72%. Para o formulado líquido a redução foi de 14,31% para AACPD e cerca de 10% para maturação. Assim, concluiu-se que houve eficiência por parte dos formulados de alecrim no controle da antracnose e no aumento da vida de prateleira da banana ‘Nanicão’.
Introduction: Soy is an agricultural crop that has great economic importance. The analysis considering the cultivated area, the production and the yield of grains contributes to research and transfer of technology to the producers. Aims: To adjust the mathematical model using simple linear regression analysis and correlation between the variables of planted area, production and productivity, in the state of Paraná and Brazil, in the last two decades. Study Design: Data collection and research of information on the cultivation of soybeans in the state of Paraná and in Brazil on official websites Place and Duration of Study: State University of Western Paraná, Post-Graduation in Agronomy, between July 2018 and December 2018. Methodology: Data were obtained from the Portal of the Brazilian Institute of Geography and Statistics between 1997 and 2017. Simple linear regression analysis and Pearson correlation analysis were used. Results: By analyzing the results, it is possible to observe significant increases in soybean production in both Paraná and Brazil over this 20-year period. Paraná achieved a 205% increase in planted area, 290% in production and 141% in average yield. Conclusion: The simple linear regression and correlation analysis showed an adjustment between the cultivated area, the production and the average productivity in the soybean crop in the period from 1997 to 2017.
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