Flutuação populacional de Diaphorina citri (Hemiptera: Psyllidae), vetor do HLB (huanglongbing) no Recôncavo da Bahia.

O psilídeo Diaphorina citri é, atualmente, o inseto vetor da doença mais devastadora dos citros. Ganhou esse status por ser o transmissor da bactéria Candidatus Liberibacter spp., causadora, do HLB. De origem asiática, o HLB foi detectado no Brasil em 2004 e encontra-se disseminada no estado de São Paulo, e em vários municípios de Minas Gerais e Paraná

Virose na cultura do morangueiro cultivado para fins comerciais no Distrito Federal.

O cultivo comercial de morango (Fragaria spp.) apresenta importância econômica nas 14 áreas rurais de diversos países e de unidades federativas do Brasil. No mundo, o 15 morangueiro é afetado por cerca de trinta espécies virais, o que resulta em baixo vigor 16 vegetativo e baixa produção. Pela escassez de relato científico sobre viroses em 17 morangueiro no Distrito Federal, o objetivo da pesquisa foi levantar a ocorrência de 18 vírus nos cultivos de propriedades rurais de produção de morango, Safra 2019, em 19 núcleo rural da região administrativa Brazlândia, após visita às propriedades e 20 autorização de coleta das folhas sintomáticas para fins de pesquisa na vertente virologia 21 vegetal: teste sorológico em laboratório e inoculação mecânica em área experimental

Lodo de estação de tratamento de esgoto como insumo para produção agrícola.

bitstream/item/175414/1/Boletim-263.pdf(Embrapa Clima Temperado. Boletim de Pesquisa e Desenvolvimento, 263.

Forage mass, tillering, nutritive value and root system of ruzigrass inoculated with plant growth promoting bacteria associated with doses of N-fertilizer

The aim of this study was evaluating the effect of the inoculation of plant growth promoting bacteria (PGPB) in forage mass, tillering, nutritive value and root system of ruzigrass (Urochloa ruziziensis (R. Germ. & Evrard) Crins (syn. of Brachiaria ruziziensis) associated with doses of N-fertilizer. The bacteria inoculated were Azospirillum brasilense Ab-V5, Pseudomonas fluorescens CCTB03 and Pantoea ananatis AMG 521, plus the control treatment (non-inoculated), associated with doses of N-fertilizer (0, 50 and 100 kg N ha-1). The experiment was performed in a randomized block design, in a 4x3 factorial scheme, with four replicates, totaling 48 plots (12 m2). There were no effects of the PGPB and the use of N-fertilizer on the leaf blade, stem+sheath, forage mass, daily and yearly accumulation of forage mass. The PGPB did not have influence on the density of tillers. The doses of 50 and 100 kg of N ha-1 increased the amount of tillers. The AMG 521 strain associated with N-fertilizer provided heavier tillers. There was no effect of the PGPB on crude protein (CP), neutral detergent fiber (NDF), as well as acid detergent fiber (ADF), and in vitro digestibility of the dry matter (IVDDM).  The use of 100 kg of N ha-1 contributed to an increase in CP and a decrease in NDF. The AMG 521 strain contributed to a smaller diameter of the root. Strains CCTB03 and AMG 521 demonstrated a smaller area, length and root density when associated with the dose of 50kg of N ha-1. In general, the PGPB were not efficient in promoting productive increments in ruzigrass

Anesthesia of Epinephelus marginatus with essential oil of Aloysia polystachya: an approach on blood parameters

This study investigated the anesthetic potential of the essential oil (EO) of Aloysia polystachya in juveniles of dusky grouper (Epinephelus marginatus). Fish were exposed to different concentrations of EO of A. polystachya to evaluate time of induction and recovery from anesthesia. In the second experiment, fish were divided into four groups: control, ethanol and 50 or 300 mu L L-1 EO of A. polystachya, and each group was submitted to induction for 3.5 min and recovery for 5 or 10 min. The blood gases and glucose levels showed alterations as a function of the recovery times, but Na+ and K+ levels did not show any alteration. In conclusion, the EO from leaves of A. polystachya is an effective anesthetic for dusky grouper, because anesthesia was reached within the recommended time at EO concentrations of 300 and 400 mu L L-1. However, most evaluated blood parameters showed compensatory responses due to EO exposure.Fundacao de Amparo a Pesquisa do Estado do Rio Grande do Sul/Programa de Apoio a Nucleos de Excelencia (FAPERGS/PRONEX) [10/0016-8]; Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [470964/2009-0]; Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior, Brazil (CAPES)info:eu-repo/semantics/publishedVersio

Mapping agricultural intensification in the Brazilian savanna: a machine learning approach using harmonized data from Landsat Sentinel-2.

Agricultural intensification practices have been adopted in the Brazilian savanna (Cerrado), mainly in the transition between Cerrado and the Amazon Forest, to increase productivity while reducing pressure for new land clearing. Due to the growing demand for more sustainable practices, more accurate information on geospatial monitoring is required. Remote sensing products and artificial intelligence models for pixel-by-pixel classification have great potential. Therefore, we developed a methodological framework with spectral indices (Normalized Difference Vegetation Index (NDVI), Normalized Difference Water Index (NDWI), and Soil-Adjusted Vegetation Index (SAVI)) derived from the Harmonized Landsat Sentinel-2 (HLS) and machine learning algorithms (Random Forest (RF), Artificial Neural Networks (ANNs), and Extreme Gradient Boosting (XGBoost)) to map agricultural intensification considering three hierarchical levels, i.e., temporary crops (level 1), the number of crop cycles (level 2), and the crop types from the second season in double-crop systems (level 3) in the 2021-2022 crop growing season in the municipality of Sorriso, Mato Grosso State, Brazil. All models were statistically similar, with an overall accuracy between 85 and 99%. The NDVI was the most suitable index for discriminating cultures at all hierarchical levels. The RF-NDVI combination mapped best at level 1, while at levels 2 and 3, the best model was XGBoost-NDVI. Our results indicate the great potential of combining HLS data and machine learning to provide accurate geospatial information for decision-makers in monitoring agricultural intensification, with an aim toward the sustainable development of agriculture

Evaluación físico-química de aceite pigmentado obtenido de la cabeza de camarón

In this work the proximal analysis, physicochemical characterization, fatty acid profile and astaxanthin content of pigmented oil obtained by fermentation shrimp heads are presented. Lipids are the major components in the oil (95%). The saponification number is 178.62 mg KOH/g, iodine value 139.8 cg iodine/g, and the peroxide value was not detected. Density and viscosity were 0.92 mg/ml and 64 centipoises, respectively. The highest contents of fatty acids were linoleic (C18:2n6), oleic (C18:1n9) and palmitic (C16:0). Eicosapentaenoic acid (C20:5n3, EPA) and docosahexaenoic acid (C22:6n3, DHA) account for 9% of the total. The content of astaxanthin was 2.72 mg/g dry weight. The pigmented oil is a dietary source of nutrients with high value such as astaxanthin.En este trabajo se presenta el análisis proximal, caracterización físico-química, perfil de ácidos grasos y contenido de astaxantina en aceite pigmentado aislado por fermentación láctica de los residuos de camarón. Los lípidos son los componentes mayoritarios (95%). El índice de saponificación es 178.62 mg KOH/g, el de yodo 139.8 cg yodo/g, y los peróxidos no fueron detectados. La densidad y la viscosidad fueron de 0.92 mg/ml y 64 centipoises, respectivamente. Los ácidos grasos en mayor cantidad fueron el linoleico (C18:2n6), oleico (C18:1n9) y palmítico (C16:0). El ácido eicosapentaenoico (C20:5n3, EPA) y el docosahexaenoico (C22:6n3, DHA) suman el 9% del total. El contenido promedio de astaxantina fue de 2.72 mg/g base seca. El aceite pigmentado es una fuente dietética de nutrientes con alto valor como la astaxantina