This essay analysis the crisis of the theory of legal sources in Brazilian contemporary law and its negative impact on the implementation of the Democratic and Social State and of Rule of Law. Without disregarding the perspective of guarantee of rights, in a Constitutional reading informed by the model of the Democratic and Social State, it is imperative to consider also the questions of democracy and the separation of powers in the light of the legal sources, which is possible by revaluing the role of legislation considered in a context of greater democratic legitimacy and created from a more effective dialogue with other legal sources.

En el presente ensayo se intenta reflexionar sobre la crisis en que se encuentra la teoría de las fuentes jurídicas en el derecho brasileño contemporáneo, y el impacto negativo sobre la efectiva concreción del Estado democrático y social. Sin desvalorizar la perspectiva de la garantía de derechos, en una lectura de la Constitución conformada por el modelo del Estado democrático de derecho, es fundamental considerar también las cuestiones de la democracia y de la separación de los poderes en la configuración de las fuentes jurídicas.

O raquitismo-da-soqueira, causado por Leifsonia xyli subsp. xyli é considerado uma das mais importantes doenças bacterianas da cana-de-açúcar (Saccharum spp.). Para verificar a possível ocorrência de Leifsonia xyli subsp. xyli na região noroeste do Paraná, foi realizado um levantamento em 32 áreas de plantio de duas usinas, utilizando-se o método sorológico "Dot blot" e um protocolo baseado na reação em cadeia da polimerase. As amostras foram coletadas em áreas cultivadas com 8 variedades e 2 clones, a partir de plantas em diferentes épocas de corte, perfazendo um total de 1395 amostras. Constatou-se a presença da bactéria no fluído fibrovascular de plantas da variedade SP77-5181 coletado em uma das propriedades, com índice de incidência de 23%. Esses resultados indicam a incidência de Leifsonia xyli subsp. xyli no noroeste do Paraná.

Ratoon stunting disease caused by Leifsonia xyli subsp. xyli is one of the most important bacterial diseases of sugarcane (Saccharum spp.). A ratoon stunting desease survey was carried in 32 sugarcane producing areas from two mills in the northwest region of Paraná State through a dot blot serological protocol and a polymerase chain reaction-based assay. A total of 1395 samples were collected in areas planted with 8 varieties and 2 sugarcane clones collected from plants at different harvest periods. The bacterium was detected in the fibrovascular fluid of the SP77-5181 variety from a producing area in a 23% rate of incidence. These data indicated that Leifsonia xyli subsp. xyli is present in the northwest region of Paraná.