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Search Results: 1 - 10 of 67381 matches for " Ivan Carlos Fernandes;Cividanes "
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Flutua o populacional e previs o de gera es de Grapholita molesta (Busck, 1916) (Lepidoptera: Tortricidae) em pessegueiro, Prunus persica (Linnaeus) Batsch = Populational fluctuation and generation prediction of Grapholita molesta (Busck, 1916) (Lepidoptera: Tortricidae) in peach, Prunus persica (Linnaeus) Batsch
Francisco Jorge Cividanes,Ivan Carlos Fernandes Martins
Acta Scientiarum : Agronomy , 2006,
Abstract: A mariposa-oriental, Grapholita molesta (Busck, 1916), encontra-se distribuída em quase todas as partes do mundo, constituindo importante praga do pessegueiro, Prunus persica (Linnaeus) Batsch. Este estudo foi desenvolvido em pomar comercial de pessegueiro localizado em Taiúva, S o Paulo, durante os anos 1997 a 2003, visando obter a flutua o populacional de adultos de G. molesta relacionando-a com fatores meteorológicos. O estudo também visou determinar uma data biofix adequada para prever a ocorrência de gera es da praga por meio de um modelo de graus-dia. A amostragem da mariposa-oriental e de insetos predadores foi efetuada com armadilha plástica com suco de pêssego e armadilha adesiva amarela, respectivamente. A influência de fatores físicos e biológicos foi avaliada por análise de correla o linear simples. Os maiores picos populacionais de G. molesta ocorreram nos meses de maio, julho e outubro. As correla es obtidas sugerem que a baixa umidade ambiental pode ter sido fator de mortalidade para G. molesta. O elevado número de pulveriza es de inseticida pode ter causado impacto negativo sobre inimigos naturais contribuindo para a elevada densidade do inseto-praga no período de 1998 a 1999. A data de constata o dapresen a de gemas vegetativas e de flor diferenciadas no pessegueiro mostrou-se adequada para se iniciar a contagem de graus-dia para prever gera es de G. molesta. Esses resultados devem ajudar aimplementa o de programas para prever picos populacionais de adultos de G. molesta visando à aplica o de inseticidas. Recomenda-se a valida o do modelo de graus-dia em outras localidades para comprovar os resultados obtidos. The oriental fruit moth, Grapholita molesta (Busck, 1916), is spread around the world and is considered an important pest on peach, Prunus persica (Linnaeus) Batsch. This work was carried out at a commercial peach orchard located in Taiúva, State of S o Paulo, Brazil, from 1997 to 2003, aiming to obtain the population fluctuation of adults of G. molesta and to relate it to meteorological factors. This study also aimed to determine an appropriate time as a biofix to predict the occurrence of generations of G. molesta using a degree-day model. Adults of the oriental fruit moth and insect predators were sampledby plastic bottle traps with peach juice and yellow sticky traps, respectively. The influence of abiotic and biotic factors was evaluated by simple correlation analysis. The highest population peaks of G. molesta were observed in May, July and October. The correlations suggest that low environmental humidity might hav
DIVERSITY AND ABUNDANCE OF PREDACEOUS ARTHROPODS ASSOCIATED WITH DIFFERENT COTTON CULTIVARS DIVERSIDADE E ABUND NCIA DE ARTRóPODES PREDADORES ASSOCIADOS A DIFERENTES CULTIVARES DE ALGODOEIRO
Lílian Lúcia Costa,Ivan Carlos Fernandes Martins,Antonio Carlos Busoli,Francisco Jorge Cividanes
Pesquisa Agropecuária Tropical , 2010, DOI: 10.5216/pat.v40i4.6720
Abstract: With the objective of studying the abundance and diversity of predaceous arthropods associated with cotton crop, and analyze the influence of meteorological factors, interactions between natural enemies and population dynamics of coccinellids associated with their principal prey, the aphid Aphis gossypii, an experiment was carried out in the region of Ipameri, Goiás State, Brazil, at the Universidade Estadual de Goiás campus. The experimental design was randomized blocks, with five treatments, consisting of the DeltaOPAL, FMX 966, FMX 993, FMX 910, and NuOPAL cultivars, in four replications. Among the arthropods sampled in the cotton crop, the coccinellids and spiders were the most abundant ones in the cultivars evaluated. Spiders occurred throughout the cotton cycle, while the coccinellids population increased gradually until 55 DAE, showing a population peak at 34 DAE, coinciding with the population peak of aphids (Aphis gossypii). Among the coccinellids observed in the cultivars under study, Scymnus spp. was the most abundant in cotton. The pentatomid and forficulid occurred from 99 to 128 days after the emergence of cotton, which corresponds to the highest density of target pest insects. It was not found influence of meteorological factors or negative interactions among predaceous arthropods. KEY-WORDS: Gossypium hirsutum; natural enemies, coccinellids. Com o objetivo de estudar a abundancia e a diversidade de artrópodes predadores associados à cultura do algodoeiro e analisar a influência de fatores meteorológicos, intera es entre inimigos naturais e a dinamica populacional de coccinelídeos associados à sua principal presa, o pulg o Aphis gossypii, um experimento foi realizado na regi o de Ipameri (GO), no Campus da Universidade Estadual de Goiás. O delineamento experimental utilizado foi o de blocos ao acaso, com cinco tratamentos, constituídos pelas cultivares DeltaOPAL, FMX 966, FMX 993, FMX 910 e NuOPAL, em quatro repeti es. Dentre os artrópodes observados na cultura do algodoeiro, os coccinelídeos e as aranhas foram os mais abundantes, nas cultivares avaliadas. As aranhas ocorreram em todo o ciclo do algodoeiro. Já os coccinelídeos aumentaram sua popula o, gradativamente, até 55 DAE, apresentando pico populacional aos 34 DAE, coincidindo com o pico populacional dos pulg es A. gossypii. Dentre os coccinelídeos observados nas cultivares em estudo, verificou-se que Scymnus spp. foi
Diversidade e distribui??o espacial de artrópodes associados ao solo em agroecossistemas
Cividanes, Francisco Jorge;Barbosa, José Carlos;Martins, Ivan Carlos Fernandes;Pattaro, Fernando;Nunes, Maria Andreia;Santos, Rodrigo Souza;
Bragantia , 2009, DOI: 10.1590/S0006-87052009000400020
Abstract: the knowledge of the diversity and distribution of ground arthropods contributes for the development of sustainable agricultural systems. this work was carried out at the paulista state university, jaboticabal campus, state of s?o paulo, brazil, during the period from february to april 2004. the objective was to analyse the community of carabidae, staphylinidae, formicidae e araneae through faunistic indexes, to determine the spatial distribution and interespecific interactions of predominant species in soybean (glycine max (l.) merr.), corn (zea mays l.) and rubber tree (hevea brasiliensis muell. arg.). the arthropods were sampled by pitfall traps distributed each 10 m in two transects of 210 m which crossed the rubber trees and advancing 60 m in the crop lines. the fauna was characterized by shannon-wiener diversity index, evenness and morisita similarity index. the differences among the occurrence of predominant species in the habitats were determined by variance analysis, and the interespecific interaction by pearson correlation. the soybean and corn under no-tillage system provided better structured carabids, ants and spiders communities than the rubber trees. among 88 captured species, 20 species were predominant and the spatial distribution of them showed that odontocheila nodicornis (dejean), glenus chrysis gravenhorst, castianeira sp. and eight ant species were more abundant in the rubber tree compared to soybean and corn. the abundance of the carabids calosoma granulatum perty and o. nodicornis decreased with increased density of the formicids pheidole sp.1 and odontomachus chelifer latreille, respectively.
Análise de fauna e flutua??o populacional de Carabidae e Staphylinidae (Coleoptera) em sistemas de plantio direto e convencional
Martins, Ivan Carlos Fernandes;Cividanes, Francisco Jorge;Barbosa, José Carlos;Araújo, Edileusa de Souza;Haddad, Gianni Queiroz;
Revista Brasileira de Entomologia , 2009, DOI: 10.1590/S0085-56262009000300019
Abstract: the objective of this study was to analyze carabid and staphylinid fauna through several faunistic indexes and to obtain the population fluctuation of the dominant species in forest fragment and soybean-corn crop in no-tillage and conventional cropping system. the samplings of the coleopteran were carried out from november/2004 to april/2007, in guaíra, s?o paulo, being biweekly during the crop period and monthly in the off-season crop. for obtaining the samples it was used pitfall traps, distributed in two transects of 200 m long being 100 m in the culture and 100 m in the fragment. the fauna was characterized by indexes of diversity, equitability, and abundance. in no-tillage system the larger number of carabid and staphylinid species and the equitability and diversity indexes indicated that the community of those beetles shows a better structure when compared with the conventional cropping system. among the carabid species abaris basistriatus stood out for having been characterized as dominant in crop and forest fragment of the two experimental areas. the species scarites sp. 4 and a. basistriatus generally presented population peaks when the crop soybean counted less than 30 days of the implantation, the other species presented population peaks that were observed in varied times of the crops. pluvial precipitation was the meteorological variable that obtained the largest number of positive correlations followed by minimum temperature.
Efeitos do plantio direto e da consorcia??o soja-milho sobre inimigos naturais e pragas
Cividanes, Francisco Jorge;Barbosa, José Carlos;
Pesquisa Agropecuária Brasileira , 2001, DOI: 10.1590/S0100-204X2001000200004
Abstract: this study evaluated the effects of no-tillage and of strip intercropping of soybean (glycine max (l.) merrill) and corn (zea mays l.) on the abundance of pests and natural enemies. the plots were arranged in a randomized complete block design for a 3 x 2 factorial experiment (soybean monoculture, corn monoculture, strip intercropping of soybean-corn x no-tillage and conventional tillage). insects were sampled by sweep net, ground cloth, visual search and suction net. among the corn insect pests, maecolaspis assimilis occurred in highest number in the no-tillage system, the same being observed with the predators cycloneda sanguinea and doru sp. on the other hand, m. assimilis and the predator toxomerus sp. were more abundant in corn monoculture than in corn of the strip-intercropping system. considering the soybean insect pests, highest number of anticarsia gemmatalis and diabrotica gracilenta was found in the conventional tillage system; the same happened to the trichogrammatidae species, while species of eulophidae family were more numerous in soybean under no-tillage system. soybean of the strip-intercropping system showed highest abundance of the insect pests megalotomus sp. and maecolaspis sp. and the natural enemies geocoris sp., lebia concina, orius sp., braconidae and scelionidae.
Efeitos do plantio direto e da consorcia o soja-milho sobre inimigos naturais e pragas
Cividanes Francisco Jorge,Barbosa José Carlos
Pesquisa Agropecuária Brasileira , 2001,
Abstract: Procurou-se avaliar os efeitos do plantio direto e da consorcia o soja (Glycine max (L.) Merrill) e milho (Zea mays L.) sobre pragas e inimigos naturais. Os tratamentos constituíram um fatorial 3 x 2 (monocultura de soja, monocultura de milho, consorcia o soja-milho x plantio direto, plantio convencional), em blocos casualizados. Os insetos foram amostrados pelo método do pano, rede entomológica, procura visual e armadilha de suc o. Entre os insetos-pragas do milho, Maecolaspis assimilis ocorreu em maior número no sistema de plantio convencional; o mesmo ocorreu com os predadores Cycloneda sanguinea e Doru sp. Por outro lado, M. assimilis e o predador Toxomerus sp. foram mais numerosos na monocultura de milho em rela o à cultura do milho consorciado com soja. Dos insetos-pragas da soja, destacaram-se pelo maior número Anticarsia gemmatalis e Diabrotica gracilenta, no sistema de plantio convencional, e o mesmo aconteceu com a espécie da família Trichogrammatidae, enquanto as espécies da família Eulophidae foram mais numerosas na soja sob sistema de plantio direto. Na soja consorciada com milho foi maior o número de insetos-pragas Megalotomus sp. e Maecolaspis sp. e dos inimigos naturais Geocoris sp., Lebia concina, Orius sp., Braconidae e Scelionidae.
Embriogênese somática a partir de embri?es imaturos em genótipos de milho
Fernandes, Eloise Helena;Prioli, Alberto José;Scapim, Carlos Alberto;Schuster, Ivan;Vieira, Elisa Serra Negra;Amaral Júnior, Ant?nio Teixeira do;Moterle, Lia Mara;
Ciência Rural , 2008, DOI: 10.1590/S0103-84782008000900031
Abstract: the establishment of a protocol for regenerating plants by tissue culture is the first step in breeding programs which have the objective of using genetic transformation on plants. the plant regeneration can be achieved either by organogenesis or embryogenesis. in the second case, the somatic embryogenesis depends on the identification of responsive genotypes which enhance the efficiency of the program. the aim of the present study was to identify maize genotypes with high capacity to produce somatic embryos and consequently regenerate maize plants. eleven genotypes (inbreds and hybrids) were investigated in the present experiment. under two-week periods, the cultures were obtained from immature embryos which were inoculated into growing medium n6 with 690mg l-1 of proline and 10mm of 2,4-d. callis of type ii, friable and embryogenic, were observed in the ld82025, cd308, and cml314 genotypes. after, they were submitted to the regeneration process and the best performance was achieved by the ld82025. no embryogenic callus was developed from cd307, cd304, oc-705, 105-b, and gu04328. in the present case, the inbred ld82025 is the most promising maize genotype for participating in a breeding program that will use the genetic transformation of maize plants.
Lie Algebroids and Classification Problems in Geometry
Rui Loja Fernandes,Ivan Struchiner
Mathematics , 2007,
Abstract: We show how one can associate to a given class of finite type G-structures a classifying Lie algebroid. The corresponding Lie groupoid gives models for the different geometries that one can find in the class, and encodes also the different types of symmetry groups.
The Classifying Lie Algebroid of a Geometric Structure I: Classes of Coframes
Rui Loja Fernandes,Ivan Struchiner
Mathematics , 2011,
Abstract: We present a systematic study of symmetries, invariants and moduli spaces of classes of coframes. We introduce a classifying Lie algebroid to give a complete description of the solution to Cartan's realization problem that applies to both the local and the global versions of this problem.
Assessoria de Imprensa: a importancia do profissional para gerenciar a crise de Hancock
Ivan Carlos de Oliveira
ECCOM , 2011,
Abstract: This article aims to show the importance of the work of professional PR activities in building the image of the superhero that appears in the movie "Hancock". Point out the tools and strategies used by the Public Relations in managing a crisis exacerbated by the media. Another important view is to understand how the media influence the construction of the image, during the route followed in the feature film.
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