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Search Results: 1 - 10 of 233382 matches for " OLIVEIRA JOSé VARGAS DE "
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Registro de Glycaspis brimblecombei em Eucalyptus spp., em Petrolina, Pernambuco, Brasil Record of Glycaspis brimblecombei on Eucalyptus spp., in Petrolina, Pernambuco State, Brazil
Mariana Oliveira Breda,José Vargas de Oliveira,Andréa Nunes Moreira Carvalho,Dalva Luiz de Queiroz
Pesquisa Florestal Brasileira , 2010, DOI: 10.4336/2012.pfb.63.253
Abstract: Glycaspis brimblecombei Moore, 1964, (Hemiptera: Psyllidae) is an insect of Australian origin which can cause severe damage on the production of different species of Eucalyptus. In Brazil, its presence was first described in the State of Sao Paulo in 2003 and it is present in several states such as Paraná, Goiás, Minas Gerais, Santa Catarina, Rio Grande do Sul, Espírito Santo and Bahia. The occurrence of this insect in Pernambuco in Petrolina municipality on a small stand of Eucalyptus spp. confirms the dispersive and adaptive potential of this specie. doi: 10.4336/2010.pfb.30.63.253 Glycaspis brimblecombei Moore, 1964, (Hemiptera: Psyllidae) é um inseto de origem australiana que causa danos severos na produ o de diferentes espécies de Eucalyptus. No Brasil, sua presen a foi descrita pela primeira vez no estado de S o Paulo em 2003 e é presente em diversos estados como Paraná, Goiás, Minas Gerais, Santa Catarina, Rio Grande do Sul, Espírito Santo e Bahia. A ocorrência deste inseto em Pernambuco foi constatada no Município de Petrolina em um pequeno povoamento de Eucalyptus spp., confirmando o potencialdispersivo e adaptativo dessa espécie. doi: 10.4336/2010.pfb.30.63.253
Biologia de Trichogramma pretiosum Riley em ovos de Sitotroga cerealella (Olivier)
ALENCAR, JOSé ADALBERTO DE;HAJI, FRANCISCA NEMAURA PEDROSA;OLIVEIRA, JOSé VARGAS DE;MOREIRA, ANDRéA NUNES;
Pesquisa Agropecuária Brasileira , 2000, DOI: 10.1590/S0100-204X2000000800021
Abstract: biological aspects of the parasitoid trichogramma pretiosum riley (hymenoptera: trichogrammatidae) were studied in eggs of its factitious host, sitotroga cerealella (olivier) (lepidoptera: gelechiidae), with the objective of obtaining basic information about the biology of this parasitoid under environmental lab conditions. there was no control of temperature, relative humidity and photoperiod with the purpose of simulating the natural conditions of the submédio s?o francisco region, pernambuco state, brazil. the mean temperature during the study was 25.9± 0.9°c. the results showed a mean duration of the period egg-adult of 9.42 days and a viability of parasited eggs of 88%. the mean number of t. pretiosum emerged by egg of the host was 1.41 with a maximum of two individuals/egg. the mean longevity of females was 5.53 days while the males lived an average of 3.08 days when both were fed with pure honey.
Biologia de Trichogramma pretiosum Riley em ovos de Sitotroga cerealella (Olivier)
ALENCAR JOSé ADALBERTO DE,HAJI FRANCISCA NEMAURA PEDROSA,OLIVEIRA JOSé VARGAS DE,MOREIRA ANDRéA NUNES
Pesquisa Agropecuária Brasileira , 2000,
Abstract: Estudaram-se, em laboratório, aspectos biológicos de Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) em ovos do hospedeiro alternativo Sitotroga cerealella (Olivier) (Lepidoptera: Gelechiidae), visando à obten o de informa es básicas sobre a biologia desse parasitóide em condi es de laboratório. N o houve controle de temperatura, umidade relativa e fotoperíodo, com o objetivo de simular as condi es do Submédio do Vale do S o Francisco, Estado de Pernambuco. A temperatura média registrada durante o desenvolvimento do trabalho foi 25,9±0,9°C. Os resultados mostraram uma dura o média do período ovo-adulto de 9,42 dias e uma viabilidade de ovos parasitados de 88%. O número médio de T. pretiosum emergido por ovo do hospedeiro foi de 1,41, com um máximo de dois indivíduos/ovo. As fêmeas viveram, em média, 5,53 dias, enquanto os machos apresentaram longevidade média de 3,08 dias, quando ambos os sexos foram alimentados com mel puro.
Manejo da lagarta-do-cartucho em milho com formula??es de nim e Bacillus thuringiensis subsp. aizawai
Lima, Marcileyne Pess?a Leite de;Oliveira, José Vargas de;Marques, Edmilson Jacinto;
Ciência Rural , 2009, DOI: 10.1590/S0103-84782009005000066
Abstract: the fall armyworm (spodoptera frugiperda) is the main pest of corn in brazil and the use of synthetic insecticides is the most commonly applied method to its control. thus, searching for efficient and low environment impact alternatives, commercial formulations of the neem natuneem? (10ml l-1 in 2005 and 15ml l-1 in 2006) and neemseto? (5 and 10ml l-1 in 2005, and 10 and 15ml l-1 in 2006) and biological insecticide bta xentari? (10g l-1 in 2005 and 2006) applied at 15, 30 and 45 and at 15, 25 and 35 days after plant emerge in 2005 and 2006, respectively, were tested. evaluations consisted of using a scale of foliar injury from 0 to 5 r before each spray. in 2005, only neemseto? 10ml l-1 was efficient at 30 days. in 2006, neemseto? 15ml l-1 and bta xentari? with average score of 0.93 and 0.98, respectively, were different from control with score of 2.38 at 35 days. at greenhouse corn plants were treated with natuneem?, neemseto? and xentari? insecticides followed by artificial infestation with newly-hatched larvae. after 10 days, it was verified that treatment were equally efficient, differing from the control, regarding to the injury score, as well as, the number of surviving worms.
Alternation of cowpea genotypes affects the biology of Callosobruchus maculatus (fabr.) (Coleoptera: Bruchidae)
Lima, Marcileyne Pess?a Leite de;Oliveira, José Vargas de;Barros, Reginaldo;Torres, Jorge Braz;
Scientia Agricola , 2004, DOI: 10.1590/S0103-90162004000100005
Abstract: callosobruchus maculatus (fabr.) is an important pest in stored cowpea, vigna unguiculata (l.) walp., with ample distribution in tropical and subtropical regions. the effect of alternation of cowpea genotypes, susceptible (s) and resistant (r), on the biology of (c. maculatus) was studied after four generations. a no-choice test was carried out in a completely randomized design, factorial scheme, with five treatments, four host combinations (rr, rs, sr and ss) and five replications. each replication consisted of 30 grains of each genotype infested by two insect couples. the number of eggs per female was not different within or between combinations, evidencing that the genotypes and their alternation did not affect c. maculatus fecundity. egg viability, however, varied between genotypes and between combinations. in combination rr, the longest duration of the immature stage was verified for genotype it89kd-245; in addition, all genotypes presented the smallest survival for the same stage, resulting in a higher mortality of the pest. the resistance index categorized combination rr as moderately resistant for genotypes it89kd-245, br14-mulato and br17-gurguéia, and as susceptible (s) only for it89kd-260, demonstrating that these combinations were not very adequate for the development of c. maculatus, a fact that was confirmed by the better performance of the pest on the genotype from combination ss, and because of a reduction in its performance when it returned to resistant genotypes.
Estabilidade da resistência de genótipos de caupi a Callosobruchus maculatus (Fabr.) em gera es sucessivas
Lima Marcileyne Pess?a Leite de,Oliveira José Vargas de,Barros Reginaldo,Torres Jorge Braz
Scientia Agricola , 2002,
Abstract: Callosobruchus maculatus (Fabr.) (Coleoptera: Bruchidae) é a principal praga do caupi (Vigna unguiculata L.) armazenado em condi es tropicais e subtropicais. Avaliaram-se a estabilidade da resistência e a capacidade de adapta o de C. maculatus a genótipos de caupi, durante seis gera es. Utilizou-se o teste sem chance de escolha, em delineamento experimental inteiramente casualizado, em esquema fatorial, com dez tratamentos, seis gera es do inseto e cinco repeti es. Cada repeti o constou de 30 gr os infestados com dois casais da praga. O número de ovos/fêmea diferiu entre os genótipos de caupi apenas na sexta gera o, e entre as gera es em BR14-Mulato, Bico de Pato, TE90-180-3E e TE87-98-8G. A viabilidade de ovos diferiu entre as gera es em BR17-Gurguéia, BR14-Mulato, IT89KD-260 e IT89KD-245, e entre os genótipos nas terceira, quinta e sexta gera es. Os genótipos diferiram entre e dentro das gera es, em rela o à dura o e a viabilidade da fase imatura. Observou-se redu o na emergência, especialmente em IT89KD-245, IT89KD-260, CNC 0434, Bico de Pato, TE90-180-10F e BR14-Mulato, provavelmente devido a substancias químicas presentes nos gr os que afetaram a sobrevivência dos insetos, ao longo das gera es. Os genótipos IT89KD-245 e IT89KD-260 comportaram-se como moderadamente resistentes. N o se observou adapta o de C. maculatus aos genótipos, mantendo-se a resistência estável através das gera es.
Alternation of cowpea genotypes affects the biology of Callosobruchus maculatus (fabr.) (Coleoptera: Bruchidae)
Lima Marcileyne Pess?a Leite de,Oliveira José Vargas de,Barros Reginaldo,Torres Jorge Braz
Scientia Agricola , 2004,
Abstract: Callosobruchus maculatus (Fabr.) is an important pest in stored cowpea, Vigna unguiculata (L.) Walp., with ample distribution in tropical and subtropical regions. The effect of alternation of cowpea genotypes, susceptible (S) and resistant (R), on the biology of (C. maculatus) was studied after four generations. A no-choice test was carried out in a completely randomized design, factorial scheme, with five treatments, four host combinations (RR, RS, SR and SS) and five replications. Each replication consisted of 30 grains of each genotype infested by two insect couples. The number of eggs per female was not different within or between combinations, evidencing that the genotypes and their alternation did not affect C. maculatus fecundity. Egg viability, however, varied between genotypes and between combinations. In combination RR, the longest duration of the immature stage was verified for genotype IT89KD-245; in addition, all genotypes presented the smallest survival for the same stage, resulting in a higher mortality of the pest. The resistance index categorized combination RR as moderately resistant for genotypes IT89KD-245, BR14-Mulato and BR17-Gurguéia, and as susceptible (S) only for IT89KD-260, demonstrating that these combinations were not very adequate for the development of C. maculatus, a fact that was confirmed by the better performance of the pest on the genotype from combination SS, and because of a reduction in its performance when it returned to resistant genotypes.
Toxicity and repellency of essential oils to Zabrotes subfasciatus (Boheman) (Coleoptera, Chrysomelidae, Bruchinae) in Phaseolus vulgaris L
Fran?a, Solange Maria de;Oliveira, José Vargas de;Esteves Filho, Alberto Belo;Oliveira, Cynara Moura de;
Acta Amazonica , 2012, DOI: 10.1590/S0044-59672012000300010
Abstract: the effects of tangerine (phaseolus vulgaris blanco), lemon (citrus medica limonum lush), pear orange (citrus sinensis l. osbeck), red copaiba (copaifera langsdorffii desf.), rosemary (baccharis dracunculifolia de candole), eucalyptus (eucalyptus globulus labillardière and e. citriodora hook), lemongrass (cymbopogon citratus stapf.) and citronella (cimbopogon nardus linnaeus) oils at several concentrations on zabrotes subfasciatus (boheman) were studied. in toxicity tests, grains of phaseolus vulgaris l. cv. rajadinho were impregnated with oils and infested with adults of z. subfasciatus up to 24 hours old. all tested oils were effective in reducing the viable egg-laying and adult emergence of this pest, in function of the concentrations used, highlighting e. citriodora and e. globulus oils which caused 100% effectiveness from 0.5 ml kg-1 concentration. in repellency tests, two arenas consisting of plastic containers, connected symmetrically to a central box by two plastic tubes were used. in one of the boxes, untreated beans were placed and on the other ones beans treated with each oil concentration were used. in the central box, five couples of z. subfasciatus were released. grains of p. vulgaris treated with oils of e. citriodora, c. citratus and c. oleifera reduced the attraction percentage of z. subfasciatus adults, while the e. globulus increased this percentage. the percentages of reduced viable eggs ranged from 17.9% (c. medica limonum) to 93.3% (c. nardus), while the reduction on the number of emerged insects was 23.9% and 95.9%, respectively for these same oils.
Effects of botanical insecticides on the instantaneous population growth rate of Aphis gossypii Glover (Hemiptera: Aphididae) in cotton
Andrade, Lígia Helena de;Oliveira, José Vargas de;Breda, Mariana Oliveira;Marques, Edmilson Jacinto;Lima, Iracilda Maria de Moura;
Acta Scientiarum. Agronomy , 2012, DOI: 10.4025/actasciagron.v34i2.10863
Abstract: botanical insecticides have been studied aiming the alternative pest control. the present study investigated the effects of these insecticides on the instantaneous population growth rate (ri) of aphis gossypii. botanical insecticides were tested in the following concentrations: compostonat?, rotenat-ce? and neempro (0, 0.50, 0.75, 1.00, 1.25, 1.50 and 1.75%); natuneem? and neemseto? (0, 0.25, 0.50, 0.75 and 1.00%) and essential oils of foeniculum vulgare mill., cymbopogom winterianus (l.), chenopodium ambrosioides l. and piper aduncum l (0, 0.0125, 0.025, 0.0375 and 0.05%). cotton leaf discs, cnpa 8h cultivar with 5 cm in diameter were immersed for 30 seconds in products broth and dried for 30 minutes. eight replicates per concentration were used and each disc was infested with five apterous adult females of a. gossypii uniform in size and confined for 10 days. compostonat?, rotenat? and neempro provided negative ri decreasing a. gossypii population. natuneem? and neemseto? and the essential oil of f. vulgare showed positive ri increasing the population. the coefficients of determination (r2) of regression lines ranged from 0.46 to 0.85. the essential oils of c. winterianus, c. ambrosioides and p. aduncum were not statistically significant precluding the establishment of regression lines.
Resistance of Brazilian diamondback moth populations to insecticides
Oliveira, Alexandre Conte de;Siqueira, Herbert álvaro Abreu de;Oliveira, José Vargas de;Silva, Jefferson Elias da;Michereff Filho, Miguel;
Scientia Agricola , 2011, DOI: 10.1590/S0103-90162011000200004
Abstract: plutella xylostella is a recurring pest on cruciferous crops around the world. in brazil, it typically requires large number of insecticide sprays, which may lead to fast evolution of resistance. the aim of this study was to assess the susceptibility of brazilian diamondback moth populations to the insecticides abamectin, deltamethrin, and spinosad. leaf dip bioassays were used to determine mortality data obtained after 48 h of exposure to insecticides and subjected to probit analysis. the population from bonito, state of pernambuco, brazil, had the highest toxicity ratio (20.2 - fold) to abamectin compared to the reference population. the lc50 values for deltamethrin ranged from 85.2 to 360.1 mg l-1, demonstrating a high survival of populations in relation to this insecticide field dose rate (7.5 mg l-1). the toxicity ratios of the estimated lc50s, however, were very low (varying from 2.2 - to 4.2 - fold). most populations exhibited toxicity ratios for spinosad, ranging from 2.3 - to 5.1 - fold, while both the lc50 and lc95 values reflected a high susceptibility to the spinosad field dosage (120 mg l-1). only the bonito - pe population resisted to abamectin, while all p. xylostella populations were resistant to deltamethrin, but particularly susceptible to spinosad because of the absence of selection pressure with it in these areas.
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