Avaliação de progênies de Eucalyptus crebra no norte do Estado de Goiás.

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Thrips species (Insecta: Thysanoptera) associated to Cowpea in Piauí, Brazil.

Thrips are still poorly known in cowpea, Vigna unguiculata (L.) Walp., in Piauí, despite their economic importance in this crop, which stands out as one of the major cultures of North and Northeast regions from Brazil. Thus, this study aimed to identify the thrips species associated to the crop in Teresina and Bom Jesus, Piauí, Brazil. From October 2007 to August 2008, cowpea inflorescences were sampled in the municipalities by the technique of simple bagging. After screenings, thrips were preserved in AGA, mounted on permanent microscope slides and identified. The identified species were: Frankliniella brevicaulis Hood, 1937, F. insularis (Franklin, 1908), F. schultzei (Trybom, 1910), F. tritici (Fitch, 1855) and Haplothrips gowdeyi (Franklin, 1908). The slides are deposited at the entomological collection of the Departamento de Biologia, Universidade Federal do Piauí. A key to the species is provided

Base de melhoramento genético de Eucalyptus e Corymbia em Rio Verde, GO: resultados parciais da cooperação técnica entre Embrapa Florestas e Cooperativa Agroindustrial dos Produtores Rurais do Sudoeste Goiano - COMIGO.

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Avaliação de cultivares de bananeiras no recôncavo sul da Bahia.

A Bahia é na atualidade o primeiro estado produtor nacional de bananas, com 17% da produção, somando 1.429.010 toneladas de cachos, seguido por São Paulo com 1.238.087 toneladas (IBGE, 2005 -2007). O Estado foi reconhecido pelo Ministério da Agricultura, Pecuária e Abastecimento (Mapa) como área livre da Sigatoka-negra, a mais temida doença das bananeiras na atualidade. A EBDA, visando assegurar o agronegócio da bananicultura no Estado, implantou 12 ?Unidades de Avaliação de Genótipos de Bananeira? resistentes a esta doença, nas principais regiões produtoras, dentre as quais, a região do Recôncavo Sul da Bahia.Uma das mais graves doenças da bananeira é a Sigatoka-negra, causada pelo fungo Micosphaerella fijiensis, Morelet, forma perfeita da fase Paracercospora fijiensis (Morelet) Deighton, que ataca as folhas da planta, ocasionando perdas em rendimentos de 50 a 100% a depender das condições edafoclimáticas e da cultivar. Além disso, a comercialização dos produtos oriundos das regiões onde a doença já foi detectada é proibida, visando impedir a disseminação do patógeno.No Brasil, as variedades tradicionalmente cultivadas são suscetíveis à Sigatoka-negra. Uma das estratégias para a solução desse problema é a criação de variedades resistentes mediante o melhoramento genético. A etapa final do melhoramento constitui-se na avaliação dos genótipos em áreas de produção (Silva, et al 2000). As principais características consideradas em trabalhos de tal natureza são: resistência à doença, ciclo da cultura, altura da planta, peso do cacho, número e comprimento de fruto (Moreira & Saes, 1984; Silva et al.2000). A avaliação de novas cultivares junto aos agricultores, em quadras demonstrativas, pode facilitar a sua adoção (Silveira et al., 1999).pdf 141

Spatial distribution of wood volume in brazilian savannas

Here we model and describe the wood volume of Cerrado Sensu Stricto, a highly heterogeneous vegetation type in the Savanna biome, in the state of Minas Gerais, Brazil, integrating forest inventory data with spatial-environmental variables, multivariate regression, and regression kriging. Our study contributes to a better understanding of the factors that affect the spatial distribution of the wood volume of this vegetation type as well as allowing better representation of the spatial heterogeneity of this biome. Wood volume estimates were obtained through regression models using different environmental variables as independent variables. Using the best fitted model, spatial analysis of the residuals was carried out by selecting a semivariogram model for generating an ordinary kriging map, which in turn was used with the fitted regression model in the regression kriging technique. Seasonality of both temperature and precipitation, along with the density of deforestation, explained the variations of wood volume throughout Minas Gerais. The spatial distribution of predicted wood volume of Cerrado Sensu Stricto in Minas Gerais revealed the high variability of this variable (15.32 to 98.38 m3 ha-1) and the decreasing gradient in the southeast-northwest direction914COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESSem informaçã

Chemical composition and biological activities of the essential oils from Lippia alba and Lippia origanoides.

There is an increasing interest in essential oils extracted from Verbenaceae plant species as potential sources of biologically active compounds that could provide a starting point for designing novel phyto-pharmaceuticals in aquaculture. The present study was aimed to investigate the chemical composition, antioxidant activity, acute toxicity and antimicrobial effects against Vibrio parahaemolyticus of essential oils extracted from Lippia alba and L. origanoides. Approximately 23 components were identified and quantified by gas chromatography-mass spectrometry and flame ionization detection in each species? essential oil. The most predominant compounds were geranial (23.0%), limonene (17.0%) and neral (15.5%) in L. alba, and thymol (47.2%), p-cymene (16.0%) and E-caryophyllene (11.3%) in L. origanoides. The essential oils have antibacterial activity against Vibrio parahaemolyticus presenting Minimum Inhibitory Concentration (MIC) and Bactericidal Concentration (MBC) values between 156-625 µg mL-1. The essential oils also show antioxidant potential estimated by 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging assays, presenting IC50 of 60.16 mg mL-1 and 0.22 mg mL-1 for L. alba and L. origanoides EO, respectively. Both oils were classified as toxic to Artemia salina nauplii. Therefore, these essential oils may be useful for controlling pathogenic bacteria important to the aquaculture industry