FarmáciaEste é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que o trabalho original seja corretamente citado. Descritores: Cymbopogon citratus; Graminaceae; óleo essencial; toxicidade aguda. ARTIGO DE SummaryThe aim of this work was the acute and sub-acute toxicological evaluation of the essential oil of Cymbopogon citratus (DC) stapf with the determination of the LD 50 in mice and the analysis of their biochemical and haematological parameters in rats. The plant is used in the Amazon folk medicine for several diseases and in their essential oil the citral is the main constituent, presenting anxiolytic, sedative, anticonvulsive and fungicide properties. The LD 50 was 3000±91.32 mg/kg, the essential oil do not change significantly the biochemical and hematological parameters when compared with the control group. The LD 50 and the biochemical and haematological results have suggested that the essential oil of Cymbopogon citratus presented a low toxicity.

The objective of this study is to evaluate the progress of whitefly Bemisia tabaci biotype B infestation during the crops of 2015, 2016 and 2017, to identify between crops studied in which they increased or decreased infestation and in which month the infestation was more representative, to identify among the cultivars which one or which are most susceptible to the attack and to map the areas of incidence of the whitefly. The research to obtain the data was carried out in the municipality of Paragominas and the data were obtained from Defense Agency of the State of Pará according to the methodology based on a model predefined by the agency. Climatic data on rainfall (mm) for crops were obtained through a database of the Brazilian Agricultural Research Corporation meteorological station. For statistical analysis of data, a database was built into Microsoft Excel spreadsheets. Data were analyzed through regression analysis and compared by the Tukey and Scott & Knott test. For the preparation of the whitefly infestation maps, the Spatial Analyst extension in the ArcGIS 10.1 software was used. In the studied area, the month of April is the one with the highest incidence of the pest, the crop of 2017 presented greater infestation, the cultivar P99R03 RR was the most susceptible to the attack of whitefly, and the cultivars P98Y51 RR and FT PGM, were more resistant to whitefly (B. tabaci) biotype B than the other cultivars.