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Search Results: 1 - 10 of 64558 matches for " PEDRO MANUEL OLIVEIRA JANEIRO NEVES "
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PRE AND POST-EMERGENCE INSECTICIDES IN MAIZE (Zea mays L.) ASSOCIATED WITH SEED TREATMENT ON Dichelops melacanthus (DALLAS) (HEMIPTERA: PENTATOMIDAE)
CARLOS BRUSTOLIN,RODOLFO BIANCO,PEDRO MANUEL OLIVEIRA JANEIRO NEVES
Revista Brasileira de Milho e Sorgo , 2011,
Abstract: Dichelops melacanthus (Dallas) (Hemiptera: Pentatomidae) is an important pest of many crops insouthern Brazil, that feed and cause damage to young plants of maize (Zea mays L.) and wheat (Triticum spp.). Thespraying of insecticide with herbicide to weed control has become a common practice to control this bug in the northand west region of Paraná State. In order to investigate strategies for bug management, the efficiency of thiametoxam+ lambdacialotrina and methamidophos was evaluated, sprayed on maize at pre and post-emergence, with and withoutseed treatment (ST). In the group without ST, insecticide spraying at pre-emergence presented small or no effect onD. melacanthus, even with added attractive (soy milk and salt). Insecticide spraying at post-emergence showed a goodcontrol of D. melacanthus, comparable to the ST, although not sufficient to reduce damage. In the group with ST,pre-emergence application was not effective in controlling the insect. Post-emergence sprays associated to ST reached80% of control.. Insecticide spraying at post-emergence in addition to ST was significant at the present experimentalconditions, although is only justified if the cost/benefit ratio is satisfactory.
Compatibility between the entomopathogenic fungus Beauveria bassiana and insecticides used in coffee plantations
Oliveira, Carolina Natali de;Neves, Pedro Manuel Oliveira Janeiro;Kawazoe, Lídio Sueki;
Scientia Agricola , 2003, DOI: 10.1590/S0103-90162003000400009
Abstract: microbial control in integrated pest management (ipm) programs of coffee plantations is an important factor for the reduction of pest population densities. the use of selective pesticides can be associated with entomopathogens, increasing the efficiency of the control and reducing the use of required insecticides. the in vitro fungitoxic effect of insecticide formulations of thiamethoxam, cyfluthrin, deltamethrin, alpha-cypermethrin, triazophos, chlorpyrifos, fenpropathrin and endosulfan and beauveria bassiana (cg 425 strain) was evaluated at three concentrations (fr = average field recommendation; 0.5 ′ fr and 2 ′ fr). effects of these products on conidia germination, vegetative growth and sporulation were compared. only five insecticides, at the fr concentration, promoted conidia viability higher than 60%. viability should be considered the most important factor to be evaluated since it is the first step of the infection process. the insecticide formulations of alpha-cypermethrin, thiamethoxam and cyfluthrin caused the lower inhibition level on conidia germination at the two lower concentrations, with no difference in relation to the control. with respect to vegetative growth analysis, thiamethoxam at the two lower concentrations was not found to cause radial growth inhibition. thiamethoxam caused the smallest inhibition level with regard to conidia production. the use of alpha-cypermethrin and thiamethoxam formulations in coffee ipm programs for a b. bassiana inoculum conservation strategy are recommended, since these products were compatible with the entomopathogenic fungus beauveria bassiana (cg 425), an important natural control agent of the coffee berry borer, hypothenemus hampei.
Suscetibilidade de Oligonychus yothersi (Acari: Tetranychidae) ao fungo Beauveria bassiana
Oliveira, Renato Cassol de;Alves, Luis Francisco Angeli;Neves, Pedro Manuel Oliveira Janeiro;
Scientia Agricola , 2002, DOI: 10.1590/S0103-90162002000100027
Abstract: the paraguay tea (ilex paraguariensis) crop is an important economical activity in southern brazil. with the increase of tea consumption in the 80s, the number of monoculture crops also increased, creating favorable conditions for the development of phytophagous insect and mite populations, such as the red mite oligonychus yothersi. the objective of this study was to evaluate the susceptibility of the red mite o. yothersi to the several strains of the beauveria bassiana fungus. the experiments were carried out in cascavel, pr, brazil. leaf disks of paraguay tea (2.2 cm2) were previously infested with 20 adult females. five disks were inoculated with 1 ml of each conidial suspension of b. bassiana strains (1x108 conidia per ml). disks were kept afloat on distilled water in plastic boxes (3 cm diameter), under controlled conditions. dead mites were transferred to a humid chamber on a daily basis to confirm the mortalities rate by the fungus. all the strains were pathogenic, with total mortality varying from 77 to 98%, 6 days after application. it was not possible to differentiate virulence levels between strains (p<0.05) by total mortality. however, confirmed mortality varied from 19 to 75%, 8 days after application, allowing for a differentiation in virulence levels between strains (p<0.05). this study concluded that the o. yothersi red mite is susceptible, at different levels, to b. bassiana tested strains.
Suscetibilidade de Oligonychus yothersi (Acari: Tetranychidae) ao fungo Beauveria bassiana
Oliveira Renato Cassol de,Alves Luis Francisco Angeli,Neves Pedro Manuel Oliveira Janeiro
Scientia Agricola , 2002,
Abstract: A cultura da erva-mate (Ilex paraguariensis) é uma importante atividade econ mica no Sul do Brasil. Com o aumento de consumo nos anos oitenta, cresceram também as áreas de monocultura, gerando condi es favoráveis para o aumento populacional de insetos e ácaros fitófagos, entre eles o ácaro vermelho Oligonychus yothersi. Este estudo avaliou a suscetibilidade do ácaro vermelho O. yothersi a vários isolados do fungo Beauveria bassiana. O experimento foi conduzido em Cascavel, PR. Discos foliares de erva-mate (2,2 cm2) foram previamente infestados com 20 fêmeas adultas. Alíquotas de 1 mL de cada suspens o de conídios dos diferentes isolados de B. bassiana, ajustadas na concentra o de 1,0x10(8) conídios mL-1 foram pulverizadas, separadamente, sobre um conjunto de 5 discos. Os discos foliares foram mantidos flutuando em água destilada, em caixas plásticas (3 cm de diametro), sob condi es controladas. Diariamente, os ácaros mortos foram transferidos para camara úmida, para confirma o de mortalidade causada pelo fungo. A mortalidade total variou entre 77 e 98% (6 dias após a aplica o), n o permitindo diferenciar os isolados quanto à virulência (P>0,05). Já a mortalidade confirmada variou entre 19 e 75%, permitindo diferenciá-los (P<0,05). O ácaro vermelho O. yothersi foi suscetível, em diferentes níveis, aos isolados de B. bassiana testados.
Compatibility between the entomopathogenic fungus Beauveria bassiana and insecticides used in coffee plantations
Oliveira Carolina Natali de,Neves Pedro Manuel Oliveira Janeiro,Kawazoe Lídio Sueki
Scientia Agricola , 2003,
Abstract: Microbial control in integrated pest management (IPM) programs of coffee plantations is an important factor for the reduction of pest population densities. The use of selective pesticides can be associated with entomopathogens, increasing the efficiency of the control and reducing the use of required insecticides. The in vitro fungitoxic effect of insecticide formulations of Thiamethoxam, Cyfluthrin, Deltamethrin, Alpha-Cypermethrin, Triazophos, Chlorpyrifos, Fenpropathrin and Endosulfan and Beauveria bassiana (CG 425 strain) was evaluated at three concentrations (FR = average field recommendation; 0.5 ′ FR and 2 ′ FR). Effects of these products on conidia germination, vegetative growth and sporulation were compared. Only five insecticides, at the FR concentration, promoted conidia viability higher than 60%. Viability should be considered the most important factor to be evaluated since it is the first step of the infection process. The insecticide formulations of Alpha-Cypermethrin, Thiamethoxam and Cyfluthrin caused the lower inhibition level on conidia germination at the two lower concentrations, with no difference in relation to the control. With respect to vegetative growth analysis, Thiamethoxam at the two lower concentrations was not found to cause radial growth inhibition. Thiamethoxam caused the smallest inhibition level with regard to conidia production. The use of Alpha-Cypermethrin and Thiamethoxam formulations in coffee IPM programs for a B. bassiana inoculum conservation strategy are recommended, since these products were compatible with the entomopathogenic fungus Beauveria bassiana (CG 425), an important natural control agent of the coffee berry borer, Hypothenemus hampei.
Interferência da metodologia nos resultados de bioensaios de sele??o de fungos entomopatogênicos para o controle de insetos
Santoro, Patricia Helena;Neves, Pedro Manuel Oliveira Janeiro;Alexandre, Talita Moretto;Alves, Luís Francisco Angeli;
Pesquisa Agropecuária Brasileira , 2007, DOI: 10.1590/S0100-204X2007000400005
Abstract: the objective of this work was to evaluate the interference of bioassay methods on the entomopathogenic fungi selection, using four beauveria bassiana isolates and alphitobius diaperinus adults. regarding the inoculation form on insect mortality, the following methods were tested: insects immersion in a conidia suspension; spraying of a suspension over the insects; and surface treatment with eight concentrations. in order to evaluate the interference of immersion time on mortality, insects were immersed in a fungal suspension for 1, 10, 20, 30, 40, 50, and 60 seconds. conidia produced on rice, insects, and synthetic medium were used to evaluate the influence of substrate on the virulence of the isolates. unioeste 4 isolate and cg 152 were the most virulents for the methods immersion and spray, respectively; however, mortality was low in all isolates for the surface treatment. mortality was proportional to the time during which insects stayed immersed, with a tendency to become stable after 40 seconds. conidia from isolates cg 71 and cg 152 produced on insects were less virulent. the methods may influence bioassay results in the fungi selection for insects control.
Transmission of entomopathogenic fungi on banana weevil control Transmiss o de fungo entomopatogênico no controle da broca do rizoma
Ernesto Antonio Lema López,Pedro Manuel Oliveira Janeiro Neves,Marilene Fancelli
Semina : Ciências Agrárias , 2012,
Abstract: The aim of this study was to assess the transmission of the entomopathogenic fungus Beauveria bassiana among adults of banana weevil (Cosmopolites sordidus) in the field. C. sordidus healthy adults were marked and released on the basis of banana plants. Two days later insects marked and inoculated with the entomopathogenic fungus were released in the same area. Pseudostem traps were placed at 7, 14, 21 and 28 days for recover of released insects and to evaluate the mortality. It was observed that 3.7% of the non inoculated insects died due to pathogen infection caracterizing B. bassiana transmission between inoculated and healthy insects due to an increase in natural pre-existing prevalescence that was 0.3% of infected insects. O objetivo deste trabalho foi avaliar a transmiss o do fungo entomopatogênico (Beauveria bassiana) entre adultos da broca do rizoma (Cosmopolites sordidus) em condi es de campo. Insetos adultos e sadios de C. sordidus foram marcados e liberados na base de touceiras de bananeiras e dois dias após na mesma área foram liberados insetos marcados e inoculados com o fungo B. bassiana. Aos 7, 14, 21 e 28 dias armadilhas de pseudocaule foram utilizadas para a recaptura dos insetos e determina o da mortalidade pelo fungo. Observou-se uma porcentagem de infec o de 3,7% dos insetos sadios recuperados, caracterizando a transmiss o de B. bassiana entre insetos inoculados e sadios devido ao aumento da prevalência natural preexistente que era de 0,3 % de insetos doentes.
Techniques and parameters used in compatibility studies between entomopathogenic fungi and phytosanitary products/ Técnicas e parametros utilizados nos estudos de compatibilidade entre fungos entomopatogênicos e produtos fitossanitários
Roberta Zani da Silva,Pedro Manuel de Oliveira Janeiro Neves,Patricia Helena Santoro
Semina : Ciências Agrárias , 2005,
Abstract: Fungi are important biological control agents of pests, because they can infect the insect at several developmental stages. The interactions between these microorganisms and phytosanitary products must be taken into account in Integrated Pest Management (IPM) programs, much the same way as it is done for predator and parasitoid insects. The adoption of products that are selective to entomopathogenic fungi will provide greater efficiency in the preservation of the entomopathogen, enhancing biological control. Selectivity/compatibility studies are, for the most part, conducted in the form of in vitro tests because of their convenience in relation to field studies. However, the methods used in in vitro tests for obtaining contact between products and entomopathogenic fungi, in addition to the evaluated parameters, are quite different, which make the comparison between results a difficult undertaking. In this review we therefore discuss the most important techniques and parameters used in these tests and suggest guidelines for protocol establishment. These protocols will facilitate the comparison of results and make important information available for the recommendation of phytosanitary products in the development of pest control strategies. Os fungos s o importantes agentes de controle biológico de pragas, pois podem infectar o inseto em diversos estágios de desenvolvimento. As intera es entre estes microrganismos e os produtos fitossanitários devem ser consideradas nos programas de Manejo Integrado de Pragas (MIP), assim como já é realizado para insetos predadores e parasitóides. A ado o de produtos seletivos aos fungos entomopatogênicos possibilitará maior eficiência na conserva o do entomopatógeno, incrementando o controle biológico. Os estudos de seletividade/compatibilidade s o, na sua grande maioria, realizados em testes in vitro pela facilidade em rela o aos estudos a campo. Entretanto, nos testes in vitro os métodos empregados no contato entre os produtos e os fungos entomopatogênicos e os parametros avaliados s o bastante diferentes o que dificulta a compara o entre os resultados. Assim, esta revis o discute as principais técnicas e parametros utilizados nestes testes e sugere diretrizes para o estabelecimento de protocolos que facilitar o a compara o de resultados e disponibilizar o informa es importantes para recomenda o de produtos fitossanitários no desenvolvimento de estratégias de controle de pragas.
Control of Hypothenemus hampei (FERRARI) on yards for coffee drying / Controle da broca-do-café (Hypothenemus hampei) FERRARI em terreiros de secagem de café
Alex Sandro Keniti Okumura,Pedro Manuel Oliveira Janeiro Neves,Anelize Fernanda Possagnolo,Viviane R. Chocorosqui
Semina : Ciências Agrárias , 2003,
Abstract: The coffee borer (Hypothenemus hampei), one of the main pests affecting coffee fruits under favorable conditions for development, can contribute to a reduction in productivity. The control of this insect is basically chemical, causing environmental, food and farmer contamination. Thus, alternatives must be found to reduce the use of chemical insecticides in the control of this insect. The objective of this work was to analyze, in a coffee drying area: 1) the capture efficiency of traps placed at different heights: 0, 35 and 70 cm; 2) the period of greatest collection (0 to 96 hrs) and 3) the effect of Beauveria bassiana spraying, in two concentrations, on the coffee fruits. Traps were placed around the area, and the insects were collected at 24, 48, 72,and 96 hours. At the same time, the drying fruits were sprayed with two concentrations of B. bassiana to evaluate the mortality rate caused by the fungus found in the emerged borer. Results showed no significant difference regarding the capture of the insects in the traps placed at different heights, and the 48 hour interval registered the highest number of borers collected. The highest fungus concentration (1 x 1011 canidia/ml) caused a mortality rate, attested by B. bassiana of approximately 50% of the emerged borers. A broca-do-cafeeiro (Hypothenemus hampei) é uma das principais pragas pelo ataque aos frutos que, sob condi es favoráveis ao seu desenvolvimento, pode contribuir para redu o da produtividade. O principal método de controle deste inseto é químico, provocando a contamina o ambiental dos alimentos e do agricultor. Assim, alternativas devem ser pesquisadas visando diminuir o uso de inseticidas químicos. O objetivo deste trabalho foi analisar, no terreiro de secagem, a eficiência de captura das armadilhas em diferentes alturas (0, 35 e 70 cm); o período de maior captura (0-96 h) e o efeito da pulveriza o de Beauveria bassiana, em duas concentra es, sobre os frutos de café, visando o controle da broca. As armadilhas foram distribuídas em volta do terreiro, sendo os insetos coletados às 24, 48, 72 e 96 horas. Paralelamente, foram pulverizadas, nos frutos em secagem no terreiro, duas concentra es de B. bassiana avaliando-se a mortalidade provocada pelo fungo nas brocas emergidas. Os resultados obtidos mostraram que n o houve diferen a significativa quanto à captura dos insetos nas diferentes alturas das armadilhas e no intervalo de 24-48 horas foi coletado o maior número de brocas. A maior concentra o do fungo (1 x 1011 conídios/ml) promoveu mortalidade confirmada por B. bassiana de aproxim
Diagnosis of the knowledge of basic informations for the usage of pesticides by vegetable growers in Londrina Region / Diagnóstico do conhecimento de informa es básicas para o uso de agrotóxicos por produtores de hortali as da Regi o de Londrina
Camila Renata Gon?alves Marques,Pedro Manuel Oliveira Janeiro Neves,Maurício Ursi Ventura
Semina : Ciências Agrárias , 2010,
Abstract: The label and the bull of pesticides contain informations about the suitable and secure usage of these compounds. The understanding of these materials is important to prevent and reduce occupational intoxications. This study deals with the diagnosis of the knowledge and understanding the basic information contained in the label of the packages by vegetable growers (mostly small) from Londrina, PR. A form was applied to growers registered at the Central de Abastecimento do Paraná (CEASA) at Londrina, about intoxications, individual protection equipment and comprehension of labels and bulls. Greater difficulties were the comprehension of the content (technical language) and the reduced size of the letters. The pictograms, color ranges and terms for the safe use of pesticides were not understood by most farmers. Inseticides were the most used and were responsible for most poisonings. O rótulo e a bula dos agrotóxicos contêm informa es sobre a utiliza o correta e segura destes compostos. O entendimento dos mesmos é importante para a preven o e redu o no número de intoxica es ocupacionais. Este trabalho teve por objetivo diagnosticar o conhecimento de informa es básicas para o uso de agrotóxicos por produtores rurais de hortali as da regi o de Londrina, dando ênfase ao entendimento dos rótulos e bulas pelos mesmos. Para isso, utilizou-se como instrumento de pesquisa, questionário aplicado a produtores rurais cadastrados na Central de Abastecimento do Paraná (CEASA) da cidade de Londrina. Foram abordadas quest es relacionadas a intoxica es, uso de equipamentos de prote o individual e entendimento dos rótulos e bulas. As maiores dificuldades foram a compreens o do conteúdo (linguagem técnica) e o tamanho reduzido das letras. Os pictogramas, as faixas de cores e termos importantes para a seguran a na utiliza o de agrotóxicos n o foram compreendidos pela maioria dos agricultores. Os inseticidas foram os produtos mais utilizados e responsáveis pelo maior número de intoxica es.
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