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Infecção experimental do carrapato Amblyomma cajennense pela bactéria Rickesttsia rickettsii, agente etiológico da febre maculosa brasileira: avaliação das transmissões transovariana e transestadial , efeito na infecção nos parâmetros biológicos do carrapato e capacidade de larvas, ninfas e adultos transmitirem a bactéria para vertebrados; Experimental infection of the tick Amblyomma cajennense with the bacterium Rickettsia rickettsii, the etiological agent of Brazilian spotted fever: evaluation of the transovarial and transstadial transmissions, effect of the infection on the biological parameters of the tick, and the capacity of larvae, nymphs, and adults to transmit the bacterium to vertebrates

Soares, João Fabio
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 03/02/2011 PT
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16.24%
Amblyomma cajennense é a principal espécie de carrapato incriminada na transmissão de Rickettsia rickettsii, agente etiológico da febre maculosa brasileira (FMB), no Brasil e outros países da América do Sul. O presente trabalho foi realizado com a finalidade de avaliar e quantificar a ocorrência das transmissões transovariana e transestadial de R. rickettsii em A. cajennense, verificando o efeito da infecção nos parâmetros biológicos do carrapato, e finalmente, a capacidade de larvas, ninfas e adultos transmitirem a bactéria para vertebrados. Para tal, cobaias (Cavia porcellus) infectadas experimentalmente com R. rickettsii foram infestadas com larvas e ninfas, para alimentação dos adultos de A. cajennense foram utilizados coelhos infectados. A biologia desses carrapatos expostos à R. rickettsii foi acompanhada até a geração seguinte de ninfa. Amostras de cada estágio evolutivo (larva, ninfa, adulto, ovo, larva, ninfa) foram testadas por PCR em tempo real para determinar a freqüência de carrapatos infectados por Rickettsia. Também foram quantificadas as transmissões transovariana e transestadial de R. rickettsii no carrapato A. cajennense. Cobaias e coelhos não infectados, utilizadas para infestação de cada um dos estágios parasitários do carrapato...

Otimização da criação de Diaphorina citri Kuwayama, 1908 (Hemiptera: Liviidae) e de Tamarixia radiata (Waterston, 1922) (Hymenoptera: Eulophidae), visando a produção em larga escala do parasitoide e avaliação do seu estab; Optimization of rearing methods for Diaphorina citri Kuwayama, 1908 (Hemiptera: Liviidae) and Tamarixia radiata (Waterston, 1922) (Hymenoptera: Eulophidae) for large-scale production and field establishment of the parasitoid

Diniz, Alexandre José Ferreira
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 26/06/2013 PT
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16.24%
Medidas para controle de Diaphorina citri Kuwayama, 1908 (Hemiptera: Liviidae) vem sendo buscadas intensamente nos últimos anos visto que este inseto é considerado a mais importante praga da citricultura devido a sua capacidade de transmitir as bactérias causadoras do Huanglongbing (HLB). Como não existem, ainda, medidas curativas para a doença, seu manejo se baseia, principalmente, no controle do vetor. O controle biológico com utilização do parasitoide Tamarixia radiata (Waterston, 1922) (Hymenoptera: Eulophidae) vem trazendo bons resultados em diversas partes do mundo. Para uma eficiente utilização deste inimigo natural, sua produção em larga escala é imprescindível, o que exige também a criação da praga. Assim, o objetivo deste trabalho foi estudar alguns pontos chaves da criação das duas espécies, visando aumentar seu rendimento, propor um sistema de produção em larga escala do parasitoide, estimando seu custo de implantação e manutenção e também avaliar o estabelecimento e eficiência do parasitoide liberado em diferentes regiões produtoras do estado de São Paulo. Visando a criação de D. citri, foram avaliados aspectos referentes ao tamanho das brotações do hospedeiro [Murraya paniculta (L.)] e viabilidade de uso de outro hospedeiro [Murraya koenigii (L.) Sprengel]. Para T. radiata foram investigados os efeitos da alimentação suplementar e um novo sistema de coleta de adultos. Foi ainda avaliada...

Performance consequences of food mixing in two passion vine leaf-footed bugs, Holymenia clavigera Herbst, 1784 and Anisoscelis foliacea marginella Dallas, 1852 (Hemiptera : Coreidae); Conseqüências da dieta mista na performance de dois coreídeos do maracujá, Holymenia clavigera Herbst, 1784 and Anisoscelis foliacea marginella Dallas, 1852 (Hemiptera : Coreidae)

Rodrigues, Daniela; Duarte, Leandro da Silva; Moreira, Gilson Rudinei Pires
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Artigo de Revista Científica Formato: application/pdf
ENG
Relevância na Pesquisa
56.7%
Holymenia clavigera (Herbst) e Anisoscelis foliacea marginella (Dallas) (Hemiptera: Coreidae: Anisoscelini) ocorrem no sul do Brasil e são hóspedes de diversas espécies de Passifloraceae. Observações preliminares indicam uma alta coexistência destas espécies em termos de uso da planta hospedeira; em adição, ovos e ninfas são extremamente semelhantes. Neste estudo comparou-se a performance das ninfas das duas espécies em passifloráceas nativas silvestres (Passiflora suberosa Linnaeus e Passiflora misera Humbold, Bonpland et Kunth) e cultivadas (Passiflora edulis Sims), oferecidas em separado e conjuntamente. Foram determinadas as taxas de desenvolvimento e mortalidade ninfal, bem como o tamanho do adulto à emergência. As partes das hospedeiras mais utilizadas para alimentação foram registradas. Para ambos os coreídeos, P. suberosa conferiu melhor performance. Ninfas de primeiro instar de ambas as espécies alimentaram- se com maior intensidade da região apical dos ramos quando comparado com as demais partes das plantas. Ambas as espécies mudaram para os frutos verdes no segundo instar, sendo este comportamento mais pronunciado em H. clavigera. Deste modo, além da semelhança morfológica, os imaturos de H. clavigera and A. foliacea marginella são extremamente similares no tangente à interação com suas plantas hospedeiras. Sugere-se que estes coreídeos possam ter evoluído através de vários processos...

Desempenho de pontas de pulverização em Brachiaria brizantha cv. MG-4 para controle de ninfas de cigarrinhas das pastagens

Maciel, Cleber D. de G.; Velini, Edivaldo Domingues; Bernardo, Rodrigo dos S.
Fonte: Associação Brasileira de Engenharia Agrícola (SBEA) Publicador: Associação Brasileira de Engenharia Agrícola (SBEA)
Tipo: Artigo de Revista Científica Formato: 66-74
POR
Relevância na Pesquisa
15.97%
O trabalho teve como objetivo estudar o desempenho de pontas de pulverização na deposição da calda inseticida para o controle de ninfas de cigarrinhas das pastagens em Brachiaria brizantha cv. MG-4. Doze tratamentos foram estudados em esquema fatorial 6x2, constituídos pelo contraste de seis pontas de pulverização e pressões de 196 e 392 kPa: TF-VP2 (336 L ha-1 e 467 L ha-1); AI11002-VS (184 L ha-1 e 200 L ha-1); XR11002-VS (200 L ha-1 e 280 L ha-1); TT11002-VP (200 L ha-1 e 280 L ha-1); TJ60-11002VS (208 L ha-1 e 280 L ha-1) e TX-VK4 (72 L ha-1 e 97 L ha-1). Para monitorar a deposição das caldas de pulverização, utilizaram-se os traçadores Azul Brilhante FD&C-1 (0,3% p/v) e Amarelo de Tartrasina FD&C-5 (0,6% p/v). Alvos artificiais, constituídos de lâminas de vidro, foram posicionados na base das plantas, próximos à superfície do solo, e os depósitos por unidade de área das soluções pulverizadas foram quantificados por espectrofotometria. As pontas TF-VP2, XR11002-VS e AI11002-VS, nas pressões de 196 e 392 kPa, proporcionam as maiores deposições da calda de pulverização na região das espumas das cigarrinhas das pastagens, apesar de apresentarem menor uniformidade na distribuição dos depósitos em relação a TX-VK4...

Development of resistance to nymphs of Amblyomma cajennense ticks (Acari : Ixodidae) in dogs

Mukai, L. S.; Netto, A. C.; Szabo, MPJ; Bechara, G. H.; Gibbs, EPJ; Bokma, B. H.
Fonte: New York Acad Sciences Publicador: New York Acad Sciences
Tipo: Artigo de Revista Científica Formato: 180-183
ENG
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Ticks have long been regarded as constraints to humans and domestic animals, but hosts often develop resistance to ticks after repeated infestations. The purpose of this investigation was to study the possible acquisition of immunity in domestic dogs to nymphs of A. cajennense by determining the tick alimentary performance after successive controlled infestations. Mean engorged weight of nymphs was not significantly different among the three infestations; molting rate from nymph to adult ticks, and the percentage of nymph recovery were also very close in all infestations. These results are similar to those obtained in studies of the dog-adult Rhipicephalus sanguineus interface. It is concluded that domestic dogs do not develop resistance against nymphs of A. cajennense ticks.

Acquired resistance of horses to Amblyomma cajennense (Fabricius, 1787) ticks

Castagnolli, K. C.; de Figueiredo, L. B.; Santana, D. A.; de Castro, M. B.; Romano, M. A.; Szabo, MPJ
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 271-283
ENG
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Acquired immunity of horses to larvae, nymphs and adults of the Amblyomma cajennense tick was evaluated through three consecutive experimental infestations of tick-bite naive hosts. Data from these infestations were compared to those from field-sensitized horses and donkeys. It was observed that tick-bite naive horses developed a low level of resistance after two infestations as shown by a significant decrease in larval yield and a tendency for lower engorged weight of nymphs during third infestation. Ticks fed on field-sensitized horses had a similar biological performance to that observed on the third infestation of tick-bite naive horses but the mean engorged nymph weight was significantly lower than that of the first infestation from tick-bite naive horses. Donkeys presented the strongest resistance with significantly lower engorged weights of all instars and of the egg mass compared to the first infestation of tick-bite naive horses. Donkeys also displayed a significantly higher resistance than field-sensitized horses as demonstrated by significantly lower egg mass weights. Overall these results indicate that donkeys but not horses maintain a strong resistance to A. cajennense ticks. The importance of these findings in relation to vectoring of tick-borne diseases is discussed. (C) 2003 Elsevier B.V. All rights reserved.

Development of resistance to nymphs of Amblyomma cajennense ticks (Acari:Ixodidae) in dogs

Mukai, Luciana S.; Castro Netto, A.; Szabó, M. P J; Bechara, G. H.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência Formato: 180-183
ENG
Relevância na Pesquisa
26.38%
Ticks have long been regarded as constraints to humans and domestic animals, but hosts often develop resistance to ticks after repeated infestations. The purpose of this investigation was to study the possible acquisition of immunity in domestic dogs to nymphs of A. cajennense by determining the tick alimentary performance after successive controlled infestations. Mean engorged weight of nymphs was not significantly different among the three infestations; molting rate from nymph to adult ticks, and the percentage of nymph recovery were also very close in all infestations. These results are similar to those obtained in studies of the dog-adult Rhipicephalus sanguineus interface. It is concluded that domestic dogs do not develop resistance against nymphs of A. cajennense ticks.

Atividade inseticida e Modos de Ação de Extratos Vegetais Sobre Mosca Branca (Bemisia tabaci)

De Jesus, Sandra Conceição Paixão; De Mendonça, Fernando Antônio Cavalcante; Moreira, José Osmã Teles
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 117-134
POR
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Insecticide potential and efficaciousness of vegetal extracts concentrations from six botanic families in three different modes were analyzed on the nymphs of the silverleaf whitefly Bemisia tabaci (Genn. 1889) on a tomato plantation Lycopersicon esculentum Mill. Nymph breeding was kept in cherry tomato shrubs. Test solutions were obtained from successive extractions with ethanol and evaporation in a rotary evaporator. Tests consisted of 10 solutions in four concentrations (500; 1,000; 1,500 and 3,000 μg/mL) and control treatment (distilled water + 1% DMSO) under three different modes of activity, namely, contact, translaminar and systemic. Experimental design was totally randomized with four repetitions and eleven treatments. Means were compared by Scott-Knott test at 5% probability and lethal concentrations (CL50) were calculated by POLO. In the case of contact activity mode, all extracts had efficiency above 50% with the highest concentration (3,000 μg/mL) in which the highest efficiency for all extracts tested was verified. There was a need for dose increase in translaminar activity mode for similar results, whereas in the case of systemic activity the best performance was obtained with extracts of Nerium oleander, Derris amazonica and Ipomoea carnea. Extracts of the last two caused a higher percentage when compared with that of other extracts in all activity modes lower than CL50.

Nymph and Adult Performance of the Small Green Stink Bug, Piezodorus guildinii (Westwood) on Lanceleaf Crotalaria and Soybean

Panizzi,Antônio Ricardo; Cardoso,Shirlei Regina; Chocorosqui,Viviane Ribeiro
Fonte: Instituto de Tecnologia do Paraná - Tecpar Publicador: Instituto de Tecnologia do Paraná - Tecpar
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2002 EN
Relevância na Pesquisa
26.34%
Lanceleaf crotalaria, Crotalaria lanceolata E. Mey (Leguminosae) was found hosting the small green stink bug, Piezodorus guildinii (Westwood), in Paraná State, Brazil. In the laboratory, nymphs showed less mortality when fed on immature pods of crotalaria (64%) than when fed on immature pods of soybean, Glycine max (L.) Merrill (88%). From 2nd stadium to adult, nymphs required less time to complete development on crotalaria (mean of females and males = 18.4 days) than on soybean (21.5 days). Fresh body weight at adult emergence was greater on crotalaria (mean of females and males = 51.4 mg) than on soybean (42.2 mg). Adult P. guildinii tended to live longer on crotalaria than on soybean. Mean adult longevity was 34.6 days on crotalaria, and 28.8 days on soybean. However, the reproductive performance of females, although similar on both foods, tended to be greater on soybean. These results indicated that P. guildinii was able to develop and reproduce on the wild host lanceleaf crotalaria. Compared to soybean, this weed plant was more suitable for nymph development, and equally suitable for adult reproduction.

Nymphal and adult performance of genetically determined types of Nezara viridula (L.) (Heteroptera: Pentatomidae), under different temperature and photoperiodic conditions

Vivan,Lúcia M.; Panizzi,Antônio R.
Fonte: Sociedade Entomológica do Brasil Publicador: Sociedade Entomológica do Brasil
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2005 EN
Relevância na Pesquisa
26.07%
The southern green stink bug, Nezara viridula (L.), has several genetically determined types, three being the most common in Brazil: G (f. smaragdula - green body), O (f. torquata - green body with lateral and median lobes of the head and anterior margin of the pronotum yellow), and Y (f. aurantiaca - gold or orange body). Nymphal and adult performance of these types was studied at 15ºC/10hL, 22ºC/12hL, and 29ºC/14hL. Mean total nymph mortality in all types at 15ºC/10hL was high (ca. 80%), especially for type G (98%); at 22ºC/12hL, the greatest mortality (55%) occurred in type G, and at 29ºC/14hL in type Y (65%). In general, at combinations of higher temperatures and longer photoperiods, nymphs developed faster. Adult longevity of type G decreased from ca. 88 days at 15ºC/10hL to ca. 57 days at 22ºC/12hL and 29ºC/14hL; for type O, adult longevity varied from ca. 81 days at 22ºC/12hL to ca. 55 days at 29ºC/14hL; type Y showed the shortest lifespan, in particular at the extremes of temperatures/photoperiods (< 20 days). Types G and Y did not reproduce at 15ºC/10hL, and type Y did not reproduce at 29ºC/14hL; type O reproduced at all three abiotic conditions. These results demonstrate that type O is the most adapted to the cooler temperature and shorter photoperiod...

Potential use of antibiotic to improve performance of laboratory-reared Nezara viridula (L.) (Heteroptera: Pentatomidae)

Hirose,Edson; Panizzi,Antônio R.; Cattelan,Alexandre J.
Fonte: Sociedade Entomológica do Brasil Publicador: Sociedade Entomológica do Brasil
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2006 EN
Relevância na Pesquisa
25.97%
The antibiotic streptomycin added to the drinking water at a concentration of 125 mg/l during nymphal development of Nezara viridula (L.) (Heteroptera: Pentatomidae)accelerated the development in ca. 2 days, increased survivorship, and doubled adult longevity; nymph survivorship and adult body weight were not affected when compared to control insects. Streptomycin has potential in rearing N. viridula, especially in improving quality of field-collected adults, by mitigating the introduction of pathogenic bacteria, and improving the quality of the population.

Photoperiod influence on the biology and phenological characteristics of Dichelops melacanthus (Dallas, 1851) (Heteroptera: Pentatomidae)

Chocorosqui,V. R.; Panizzi,A. R.
Fonte: Instituto Internacional de Ecologia Publicador: Instituto Internacional de Ecologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2003 EN
Relevância na Pesquisa
26.24%
The influence of the photoperiod on the biology and seasonal morphs of Dichelops melacanthus (Dallas, 1851) was studied in the laboratory. Four different photoperiods (11, 12, 13, and 14 hL = hours of light) were tested, keeping the temperature at 25 ± 1ºC and the relative humidity at 65 ± 5%. Nymph developmental time tended to be longer under shorter photophases (11 and 12 hL). The 14-hour photophase (long day) resulted in lower nymph mortality rates. Females maintained at 13 and 14 hL showed greater weight gain (1st-28th day) than females under 12 hL. D. melacanthus showed reproductive oligopause induced by short photophases, especially when exposed to 11 hL. Under 13 and 14 hL, 85% and 65% of females oviposited, respectively, in comparison to 10% and 15% of females ovipositing under 11 and 12 hL, respectively. Fecundity (number of egg masses and number of eggs/female) was greater in the longer than under the shorter photophases. Seasonal dimorphism induced by photoperiod was observed in D. melacanthus adults. Under short-day conditions (11 and 12 hL), adults showed short and rounded shoulder spines, grayish brown abdomen (mainly in 11 hL), high lipid contents, and lower percentage of mature reproductive organs. Under long-day conditions (13 and 14 hL)...

Performance consequences of food mixing in two passion vine leaf-footed bugs, Holymenia clavigera (Herbst, 1784) and Anisoscelis foliacea marginella (Dallas, 1852) (Hemiptera; Coreidae)

Rodrigues,D.; Duarte,LS.; Moreira,GRP.
Fonte: Instituto Internacional de Ecologia Publicador: Instituto Internacional de Ecologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2007 EN
Relevância na Pesquisa
56.67%
Holymenia clavigera (Herbst) and Anisoscelis foliacea marginella (Dallas) (Hemiptera: Coreidae: Anisoscelini) are distributed in southern Brazil and use various passion vine species (Passifloraceae) as host-plants. Preliminary observations indicate a high coexistence of these species in terms of host-plant use; in addition, there is a strong similarity regarding egg and nymph morphology. In this study, the most suitable feeding sites for nymph performance on wild (Passiflora suberosa Linnaeus and Passiflora misera Humbold, Bonpland et Kunth) and cultivated (Passiflora edulis Sims) hosts were determined by rearing them on each host and on the combination of hosts. Performance was determined by evaluating nymph development and survivorship, and adult size at emergence. Plant parts used were also recorded. For both species, P. suberosa was the most suitable host plant. First instar nymphs of both species fed on terminal buds more frequently when compared to other plant parts. Second instar nymphs switched to green fruits, whose behavior was more pronounced for H. clavigera. Thus, H. clavigera and A. foliacea marginella immatures are extremely similar in terms of host-plant use and consequences for performance, in addition to their morphological similarity. We suggest that these coreids may have evolved through several processes...

Inoculation of tomato plants with rhizobacteria enhances the performance of the phloem-feeding insect Bemisia tabaci

Shavit, Roee; Ofek-Lalzar, Maya; Burdman, Saul; Morin, Shai
Fonte: Frontiers Media S.A. Publicador: Frontiers Media S.A.
Tipo: Artigo de Revista Científica
Publicado em 13/08/2013 EN
Relevância na Pesquisa
26.07%
In their natural environment, plants experience multiple biotic interactions and respond to this complexity in an integrated manner. Therefore, plant responses to herbivory are flexible and depend on the context and complexity in which they occur. For example, plant growth promoting rhizobacteria (PGPR) can enhance plant growth and induce resistance against microbial pathogens and herbivorous insects by a phenomenon termed induced systemic resistance (ISR). In the present study, we investigated the effect of tomato (Solanum lycopersicum) pre-inoculation with the PGPR Pseudomonas fluorescens WCS417r, on the performance of the generalist phloem-feeding insect Bemisia tabaci. Based on the ability of P. fluorescens WCS417r to prime for ISR against generalists chewing insects and necrotrophic pathogens, we hypothesized that pre-inoculated plants will strongly resist B. tabaci infestation. In contrast, we discovered that the pre-inoculation treatment increased the tomato plant suitability for B. tabaci which was emphasized both by faster developmental rate and higher survivability of nymph stages on pre-inoculated plants. Our molecular and chemical analyses suggested that the phenomenon is likely to be related to: (I) the ability of the bacteria to reduce the activity of the plant induced defense systems; (II) a possible manipulation by P. fluorescens of the plant quality (in terms of suitability for B. tabaci) through an indirect effect on the rhizosphere bacterial community. The contribution of our study to the pattern proposed for other belowground rhizobacteria and mycorrhizal fungi and aboveground generalist phloem-feeders is discussed.

Maternal effects and maternal selection arising from variation in allocation of free amino acid to eggs

Newcombe, Devi; Hunt, John; Mitchell, Christopher; Moore, Allen J
Fonte: BlackWell Publishing Ltd Publicador: BlackWell Publishing Ltd
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
16.07%
Maternal provisioning can have profound effects on offspring phenotypes, or maternal effects, especially early in life. One ubiquitous form of provisioning is in the makeup of egg. However, only a few studies examine the role of specific egg constituents in maternal effects, especially as they relate to maternal selection (a standardized selection gradient reflecting the covariance between maternal traits and offspring fitness). Here, we report on the evolutionary consequences of differences in maternal acquisition and allocation of amino acids to eggs. We manipulated acquisition by varying maternal diet (milkweed or sunflower) in the large milkweed bug, Oncopeltus fasciatus. Variation in allocation was detected by examining two source populations with different evolutionary histories and life-history response to sunflower as food. We measured amino acids composition in eggs in this 2 × 2 design and found significant effects of source population and maternal diet on egg and nymph mass and of source population, maternal diet, and their interaction on amino acid composition of eggs. We measured significant linear and quadratic maternal selection on offspring mass associated with variation in amino acid allocation. Visualizing the performance surface along the major axes of nonlinear selection and plotting the mean amino acid profile of eggs from each treatment onto the surface revealed a saddle-shaped fitness surface. While maternal selection appears to have influenced how females allocate amino acids...

Effect of resistant and susceptible soybean cultivars on the nymphal development, fecundity and mortality of Euschistus heros (Hemiptera:pentatomidae).

MICHEREFF, M. F. F.; BLASSIOLI-MORAES, M. C.; HOFFMANN-CAMPO, C. B.; DINIZ, I. R.; SILVEIRA, S.; LAUMANN, R. A.; BORGES, M.
Fonte: In: LATIN AMERICAN MEETING OF CHEMICAL ECOLOGY, 1., 2010, Colonia de Sacramento. Abstracts? Colonia de Sacramento: Latin American Association of Chemical Ecology, 2010. p. 138. Publicador: In: LATIN AMERICAN MEETING OF CHEMICAL ECOLOGY, 1., 2010, Colonia de Sacramento. Abstracts? Colonia de Sacramento: Latin American Association of Chemical Ecology, 2010. p. 138.
Tipo: Resumo em anais de congresso (ALICE)
EN
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The association of resistant varieties and biological control has great interest and potential to be used for pest management. lhe aims of this work were to evaluate the effect of cultivars Silvânia (susceptible to stink bug attack), Dowling e IACI00 (resistant) on E. heras nymph development and to investigate the influence of the flavonoids on the resistance [1]. Nymphs of stink bug were placed in Petri dishes on a diet of soybean pods and observed daily. After adult emergence, they were weight and then put in pairs for mating. lhe nymph mortality, the adult longevity, fecundity and the eggs fertility were evaluated for each cultivar. To quantify the flavonoid compounds, extracts of immature seeds (cv Silvânia and Dowling) undamaged and damage by herbivory, were analysed using high performance liquid chromatography (HPLC). lhe nymphs reared on cv Dowling did not complete their biological cycle. Survivorship curves of immatures in cv. Sylvania and IAClOO, analysed by Kaplan-Meier Survival Distribution, did not show significant difference. lhe medium weight of adults on others cultivars was not different. lhe medium male longevity on cv IAClOOwas 11.0 days, while on cv Silvânia was 35.8 days; for females was 13.4 days on cv IAClOOand 40.6 days on cv Silvânia. lhe female fecundity (105.7 eggs/female) and egg fertility (66.3 nymphs) on cv Silvânia were higher than on cv IACI00 (10.2 eggs/female e 5.8 nymphs). Total amount of flavonoids compounds was higher in cv Silvânia than in cv Dowling...

Potential use of antibiotic to improve performance of laboratory-reared Nezara viridula (L.) (Heteroptera: Pentatomidae).

HIROSE, E.; PANIZZI, A. R.; CATTELAN, A. J.
Fonte: Neotropical Entomology, Piracicaba, v. 35, n. 2, p. 279-281, Mar./Apr. 2006. Publicador: Neotropical Entomology, Piracicaba, v. 35, n. 2, p. 279-281, Mar./Apr. 2006.
Tipo: Artigo em periódico indexado (ALICE)
EN
Relevância na Pesquisa
25.97%
The antibiotic streptomycin added to the drinking water at a concentration of 125 mg/1 during nymphal development of Nezara viridula (L.) (Heteroptera: Pentatomidae) accelerated the development in ca. 2 days, increased survivorship, and doubled adult longevity; nymph survivorship and adult body weight were not affected when compared to control insects. Streptomycin has potential in rearing N. viridula, especially in improving quality of field-collected adults, by mitigating the introduction of pathogenic bacteria, and improving the quality of the population.; 2006

Nymphal and adult performance of genetically determined types of Nezara viridula (L.) (Heteroptera: Pentatomidae), under different tempetature and photoperiodic conditions.

VIVAN, L. M.; PANIZZI, A. R.
Fonte: Neotropical Entomology, Piracicaba, v. 34, n. 6, p. 911-915, Nov./Dec. 2005. Publicador: Neotropical Entomology, Piracicaba, v. 34, n. 6, p. 911-915, Nov./Dec. 2005.
Tipo: Artigo em periódico indexado (ALICE)
EN
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26.07%
The southern green stink bug, Nezara viridula (L.), has several genetically determined types, three being the most common in Brazil: G (f. smaragdula - green body), O (f. torquata - green body with lateral and median lobes of the head and anterior margin of the pronotum yellow), and Y (f. aurantiaca - gold or orange body). Nymphal and adult performance of these types was studied at 15°C/1OhL, 22°C/12hL, and 29°C/14hL. Mean total nymph mortality in alI types at 15°C/ 10hL was high (ca. 80%), especially for type G (98%); at 22°C/12hL, the greatest mortality (55%) occurred in type G, and at 29°C/14hL in type Y (65%). In general, at combinations of higher temperatures and longer photoperiods, nymphs developed faster. Adult longevity of type G decreased from ca. 88 days at 15°C/1 OhL to ca. 57 days at 22°C/12hL and 29°C/14hL; for type O, adult longevity varied from ca. 81 days at 22°C/12hL to ca. 55 days at 29°C/14hL; type Y showed the shortest lifespan, in particular at the extremes of temperatures/photoperiods ( < 20 days). Types G and Y did not reproduce at 15°C/10hL, and type Y did not reproduce at 29°C/14hL; type O reproduced at alI three abiotic conditions.These results demonstrate that type O is the most adapted to the cooler temperature and shorter photoperiod...

Nutritional enhancement of leaves by a psyllid through senescence-like processes: insect manipulation or plant defence?

Steinbauer, M.J.; Burns, A.E.; Hall, A.; Riegler, M.; Taylor, G.S.
Fonte: Springer Verlag Publicador: Springer Verlag
Tipo: Artigo de Revista Científica
Publicado em //2014 EN
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Some herbivores can modify the physiology of plant modules to meet their nutritional requirements. Induction of premature leaf senescence could benefit herbivores since it is associated with the mobilisation of nutrients. We compared the effects of nymphal feeding by Cardiaspina near densitexta on Eucalyptus moluccana with endogenous processes associated with senescence to assess the relative merits of an insect manipulation or plant defence interpretation of responses. Evidence supporting insect manipulation included increased size of fourth and fifth instar nymphs (in the latter the effect was restricted to forewing pad length of females) on leaves supporting high numbers of conspecifics and feeding preventing leaf necrosis. Intra-specific competition negated greater performance at very high densities. High and very high abundances of nymphs were associated with increased concentrations of amino acid N but only very high abundances of nymphs tended to be associated with increased concentrations of six essential amino acids. Contrary to the insect manipulation interpretation, feeding by very high abundances of nymphs was associated with significant reductions in chlorophyll, carotenoids and anthocyanins. Evidence supporting plant defence included the severity of chlorosis increasing with the abundance of nymphs. Leaf reddening did not develop because ambient conditions associated with photoinhibition (high irradiance and low temperature) were not experienced by leaves with chlorotic lesions. Leaf reddening (from anthocyanins) alone is not expected to adversely affect nymphal survival; only leaf necrosis would kill nymphs. For senescence-inducing psyllids...

Development of resistance to nymphs of Amblyomma cajennense ticks (Acari : Ixodidae) in dogs

Mukai, Luciana S.; Castro Netto, A.; Szabó, M. P J; Bechara, G. H.
Fonte: New York Acad Sciences Publicador: New York Acad Sciences
Tipo: Conferência ou Objeto de Conferência Formato: 180-183
ENG
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Ticks have long been regarded as constraints to humans and domestic animals, but hosts often develop resistance to ticks after repeated infestations. The purpose of this investigation was to study the possible acquisition of immunity in domestic dogs to nymphs of A. cajennense by determining the tick alimentary performance after successive controlled infestations. Mean engorged weight of nymphs was not significantly different among the three infestations; molting rate from nymph to adult ticks, and the percentage of nymph recovery were also very close in all infestations. These results are similar to those obtained in studies of the dog-adult Rhipicephalus sanguineus interface. It is concluded that domestic dogs do not develop resistance against nymphs of A. cajennense ticks.