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Search Results: 1 - 10 of 82000 matches for " Luiz Carlos Dias Rocha "
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Inventory and bioecological aspects of parasitoids of the genus Trichogramma (Hymenoptera: Trichogrammatidae) associated to Erinnys ello (Linnaeus) (Lepidoptera: Sphingidae) in cassava crops = Inventário e aspectos bioecológicos de parasitóides do gênero Trichogramma (Hymenoptera: Trichogrammatidae) associados a Erinnys ello (Linnaeus) (Lepidoptera: Sphingidae) em cultura da mandioca
Luiz Carlos Dias Rocha,Geraldo Andrade Carvalho,Alexandre Pinho Moura
Acta Scientiarum : Agronomy , 2006,
Abstract: This work aimed to study the population dynamics, to determinate thespecies of Trichogramma occurring in cassava crops in the city of Lavras, Minas Gerais State, Brazil, as well as to evaluate biological parameters of those parasitoids associated to Erinnys ello (Linnaeus, 1758). This study was carried out from January of 2000 to February of 2003, in plants taken at 15-days intervals. The collected eggs were kept in laboratorial climatic chambers at 25±2oC, RH of 70±10% and 12h photophase. During the collecting period, variations were observed in the population dynamics of Trichogramma spp.. Variations were also observed in the months of high rainfall when, due to the high host occurrence, the parasitoids presented the highest population density. The average rate of natural parasitism of E. ello eggs was 52.6%, the sex ratio was 0.8, and deformation was 0.4%. Two species were notified on E. ello: Trichogramma demoraesi Nagaraja, 1983 and Trichogramma pretiosum Riley, 1879. Objetivou-se neste trabalho realizar o levantamento populacional, determinar as espécies de Trichogramma que ocorrem no município de Lavras, Estado de Minas Gerais, Brasil, associadas à cultura damandioca, bem como avaliar parametros biológicos desses parasitóides em Erinnys ello (Linnaeus, 1758). As coletas foram realizadas de janeiro de 2000 a fevereiro de 2003, em plantas tomadas ao acaso durante um período de busca de uma hora, em intervalos médios de 15 dias. Os ovos coletados foram mantidos no laboratório em camaras climáticas reguladas a 25±2oC, UR de 70±10% e fotofase de 12 horas. Durante o período de realiza o desse estudo, observaram-se varia es na flutua o populacional de Trichogramma spp., sendo que nos meses de elevada precipita o pluviométrica, em fun o da maior disponibilidade do hospedeiro, os parasitóides apresentaram maior densidade populacional. A taxa de parasitismo natural média realizada por Trichogramma spp. foi de 52,6%, a raz o sexual foi de 0,8, a ocorrência de deforma es foi de 0,4%, sendo notificadas duas espéciesem ovos de E. ello: Trichogramma demoraesi Nagaraja, 1983 e Trichogramma pretiosum Riley, 1879.
Toxicidade de produtos fitossanitários para adultos de Orius insidiosus (Say) (Hemiptera: Anthocoridae)
Rocha, Luiz Carlos Dias;Carvalho, Geraldo Andrade;Moura, Alexandre Pinho;Torres, Fabrícia Zimermann Vilela;
Bragantia , 2006, DOI: 10.1590/S0006-87052006000200013
Abstract: the aim of this work wasevaluate the toxicity of abamectin, acephate, azoxystrobin, benomyl, chlorfenapyr, imibenconazole, iprodione, metalaxyl + mancozeb and triforine on adults of orius insidiosus (say). these pesticides were used at the concentrations indicated by the manufacturers. all of them are in testing process for pest and diseases control on chrysanthemums crop, and were spraying on adults using a potter's tower. the bioassays were carried out in laboratory, under controlled conditions at 25±2oc, rh of 70±10% and 12-h photophase. the toxicity of the pesticides to adults was determined by the total effect (e), considering the mortality rate and oviposition reduction. toxicity effect was classified according to scale proposed by iobc. abamectin, acephate and chlorfenapyr were toxic to adults de o. insidiosus, and caused reduction in their survival. females of o. insidiosus treated with abamectin and acephate caused reduction on eggs viability, whereas the application of abamectin and chlorfenapyr cause encrease on pre-oviposition period. the fungicides azoxystrobin, benomyl, imibenconazole, iprodione, metalaxyl + mancozeb and triforine presented low toxicity to o. insidiosus.
Seletividade de inseticidas utilizados em cultura cafeeira para larvas de Cryptolaemus montrouzieri Mulsant
Rocha, Luiz Carlos Dias;Carvalho, Geraldo Andrade;Moscardini, Valéria Fonseca;Rezende, Denise Tourino;
Ciência Rural , 2011, DOI: 10.1590/S0103-84782011000600004
Abstract: as well as most of the crops, in coffee crop, the association of selective compounds and natural enemies, composes an important tool for the integrated pest management (ipm). the objective of this study was to evaluate the selectivity of some pesticides used in coffee crops on larvae of cryptolaemus montrouzieri mulsant, 1853 (coleoptera: coccinellidae) under controlled laboratory conditions (climatic chamber) at 25±2°c, rh of 70±10% with a 12 h-photophase. the randomized experimental design was used, with six treatments and ten repetitions, being each composed for two larvae. for the comparisons of the averages of treatments, a factorial scheme was used with the products x number of instars for the different instars subsequent the application. the pesticides and doses in g of a.i. l-1 were: thiamethoxan (0.5), imidacloprid (0.7), mineral oil (13.3), endosulfan (2.63) and dimethoate (0.48). distilled water was used as control. the sprayings of the pesticides were accomplished using a potter's tower. the parameters evaluated were: specimens survival after the application of the compounds, and the compounds effects over the reproductive parameters of the predator. thiamethoxan (0.5), imidacloprid (0.7) and endosulfan (2.63) were the most harmful to the treated individuals and for the first two compounds it was observed 100% of larvae mortality of the first and second instars soon at 1 day after the application and reduction in the survival of the larvae of third and fourth instars. dimethoate (0.48) was harmful for the larvae of the first instar and slightly harmful for larvae of fourth instar. as a function of the selectivity presented by mineral oil (13.3), it can be recommended aiming its compatibilization with the c. montrouzieri natural enemy in programs of ipm in coffee crop.
Avalia o da toxicidade de inseticidas utilizados em roseira para adultos de Orius insidiosus (Say) (Hemiptera: Anthocoridae) = Toxicity evaluation of insecticides used in rose crops to adults of Orius insidiosus (Say) (Hemiptera: Anthocoridae)
Fabrícia Zimermann Vilela Torres,Geraldo Andrade Carvalho,Jander Rodrigues de Souza,Luiz Carlos Dias Rocha
Acta Scientiarum : Agronomy , 2007,
Abstract: Percevejos do gênero Orius têm sido usados como agentes entomófagos emdiversos sistemas agrícolas, obtendo-se sucesso no controle de diferentes pragas. Em roseira esses percevejos podem ser utilizados no controle de tripes, a principal praga desse cultivo. Objetivou-se avaliar o impacto de inseticidas utilizados em roseira sobre adultos de Orius insidiosus (Say), por meio da pulveriza o direta sobre os percevejos e por ingest o de ‘alimento tratado. Utilizaram-se formula es comerciais dos produtos (g i.a. 100 mL-1): endosulfam (0,021), formetanato (0,04), espinosade (0,0144) e deltametrina (0,0008), sendo que somente endosulfam foi avaliado em teste de ingest o de alimento tratado. Utilizou-se água destilada no tratamento controle. Os bioensaios foram realizados em laboratório. Para pulveriza o dos produtos sobre os adultos utilizou-se torre de Potter. Nos testes de ingest o, ovos de Anagasta kuehniella (Zeller) foram imersos na calda inseticida e oferecidos ao predador. Avaliaram-se a mortalidade, a reprodu o e a capacidade predatória dosindivíduos sobreviventes. Em pulveriza o, o inseticida deltametrina foi nocivo aos adultos de O. insidiosus; espinosade foi moderadamente nocivo e endosulfam e formetanato foram levemente nocivos. Nos testes de ingest o de alimento tratado, endosulfam foi levemente nocivo. A capacidade predatória de O. insidiosus n o foi afetada pelo endosulfam em nenhum dos testes realizados. Predatory bugs of the genus Orius have been used as entomophagous agents in several agricultural systems, obtaining success in the control of different pests. In rose crops these bugs can be used in the control of thrips, the principal pest of this crop. This study aimed to evaluate the impact of some insecticides used in rose crops to adults of Orius insidiosus (Say), by direct spraying on the bugs and by ingesting contaminated food. Commercial formulations of the insecticides used (g a.i. 100 mL-1) were: endosulfan (0.021), formetanate (0.04), spinosad (0.0144) and deltamethrin (0.0008). Out of these, only endosulfan was evaluated as for ingestion ofcontaminated food test. Distilled water was used as control. The bioassays were carried out in laboratory. A Potter’s tower was used to spray the products on adults. Eggs of Anagasta kuehniella (Zeller) were dipped in the insecticide solutions and offered to the predator. The mortality, the reproduction and the predatory capacity of the survivors were evaluated. By spraying, deltamethrin was harmful to adults of O. insidiosus; spinosad was moderately harmful and endosulfan and formetanate were
Produtos naturais e sintéticos no controle de Leucoptera coffeella (Guérin-Mèneville & Perrottet, 1842) (Lepdoptera: Lyonetiidae) e seus efeitos sobre a preda??o por vespas
Mendon?a, José Marcos Angélico de;Carvalho, Geraldo Andrade;Guimar?es, Rubens José;Reis, Paulo Rebelles;Rocha, Luiz Carlos Dias;
Ciência e Agrotecnologia , 2006, DOI: 10.1590/S1413-70542006000500011
Abstract: the control of the coffee leaf miner leucoptera coffeella (guérin-mèneville & perrottet, 1842) by broad spectrum pesticides can cause great ecological problems. thus, the search for products with low toxicity and that do not affect natural enemies is necessary. the objective of the present work was to evaluate the action of natural products like pyroligneous extract biopirol? (2.0; 4.0; 8.0 and 16.0%) and azadirachtin nim-i-go? (0.25; 0.50; 0.75 and 1.0%) and the pesticides lambdacyhalothrin (0.01 mg a.i./ml) and ethion (1.5 mg a.i./ml) over coffee leaf miner and their effects over predator wasps, under field conditions. in order to achieve that, an experimental field of around 1,2 ha was installed, in a coffee plantation of the cultivar catuaí vermelho, in lavras, mg. it was noted that the concentrations of pyroligneous extract and azadirachtin did not control the leaf miner and did not affect the predation for wasps. however, the larvae were killed by ethion, right after its application, being the effect weaker as the time passed. lambdacyhalothrin presented the lower toxicity to the larvae after its application, followed by a significant increase in the control along the time.
Rea??o peritoneal tardia ao calculo biliar humano, de colesterol, deixado na cavidade abdominal de ratos
Bertges, Luiz Carlos;Silva, Alcino Lázaro da;Bastos, Ronaldo Rocha;Gollner, ?ngela Marial;Peters, Vera Maria;Lessa, Walkyria Dutra Dias Araújo;
Revista do Colégio Brasileiro de Cirurgi?es , 1999, DOI: 10.1590/S0100-69911999000400003
Abstract: it was evaluated the late results of human gallstones placed into peritoneal cavity of rats. five groups were created. in the first (group a) five rats were submitted only to laparotomy and handling of abdominal cavity, in the second (group b) five rats were submitted to laparotomy and a stitch was placed into right abdominal wall and in mesenterium between the ileus and cecum, in the third (group c) ten rats received a gallstone left free into abdomen, in the fourth (group d) ten rats received a gallstone fixed into right abdominal wall and in the fifth (group e) ten rats received a gallstone fixed in mesenterium between the ileus and cecum. one rat in each group was selected to be use as a pilot and were re-laparotomized after 1 month and 3 months, in order to look for any possible alteration. all rats were dead after five months when the abdominal cavity was observed and specimens were collected around the gallstones to histopathology. ln groups a and b there were not important macroscopic alterations. the gallstones were not absorved in groups c, d and e and were involved in a transparent tissue or blocked by omentum and intestinal loops. the rat used as a pilot in group e had a sub- intestinal occlusion and the gallstone was not found after 5 months. we supposed that it migrated to into the bowel. histopathology did not showed any alteration in groups a and b but showed fibrosis. inflamatory cells, hemossiderin, calcifications and a foreign body like reaction in groups c, d and e (except the pilot rat). it was concluded that gallstones were not absorbed and a foreign body like reaction appeared. the gallstones were involved with fibrosis and inflamatory cells.
Editorial
Dias Luiz Carlos
Química Nova , 2001,
Abstract:
Editorial
Dias Luiz Carlos
Química Nova , 2003,
Abstract:
Abstract
Dias Luiz Carlos
Química Nova , 2004,
Abstract:
Abstract
Dias Luiz Carlos
Química Nova , 2002,
Abstract:
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