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| Registros recuperados: 40 | |
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| Cortez,Mirko G. R.; Waquil,José M.. |
| An experiment was conducted in the greenhouse to evaluate the effect of sorghum (Sorghum bicolor) cultivars and Spodoptera frugiperda (J. E. Smith) infestations, at different plant developmental stages, on sorghum yield. Second instar larvae of S. frugiperda were used to infest plants. Significant differences (P ≤ 0,05) were found for the factors cultivar and stage of infestation for panicle (size and weight), grain (volume and weight) and 100 grain weight. No significant differences were observed for grain yield between damaged plant and the checks for the cvs. AG 3001 and CMSXS 375. However, the yield loss for the cv. BR 300 ranged from 11,6 to 21,7% for plants infested at 1st (15 days) and 4th stage (15 and 37 days), respectively. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Insecta; Fall armyworm; Pest management; Sorghum bicolor; Plant resistance; Pest damage. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80591997000200028 |
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| Silva,Deise Maria P. da; Oliveira,José V. de; Tabosa,José Nildo; Barros,Reginaldo; Santos,Elton O. dos; Azevedo,Simone S.. |
| Dois experimentos foram estudados em Casa-de-Vegetação, com o objetivo de identificar fontes de resistência em 15 cultivares de milho à Spodoptera frugiperda. Utilizaram-se as cultivares CMS-35, CMS-36, Dina-70, Cargill-525, Pioneer-3210, Pioneer-6875, BR-201, BR-451, AG-106, AG-510, CMS-22, Contimax-322, Jatinã C3 Anão, Cargill-511 e BR-106. As plantas foram infestadas com 30 lagartas recém eclodidas por planta, quando estas apresentavam de 6 a 8 folhas. Após 10 e 14 dias da infestação, foram avaliados os danos através de uma escala visual de notas de 0 a 9. Não houve diferença estatística significativa entre as cultivares para os parâmetros estudados: dano, peso, comprimento e sobrevivência das lagartas. No entanto, as correlações lineares entre o peso x... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Resistance; Zea mays; Foliar Damage; Fall armyworm; Larvae weight. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000100014 |
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| Silva,Deise Maria P. da; Oliveira,José V. de; Tabosa,José Nildo; Barros,Reginaldo; Santos,Elton O. dos; Azevedo,Simone S.. |
| Com o objetivo de identificar fontes de resistência à Spodoptera frugiperda (J. E. Smith, 1797), foram avaliadas as cultivares de milho CMS-22, CMS-35, AG-106, Dina-70, AG-510 e CMS-36 em campo, utilizando-se o delineamento experimental de blocos ao acaso com quatro repetições. Utilizaram-se as variáveis: danos foliares, obtidos através da escala visual de notas, sobrevivência, peso e comprimento das lagartas, 10 dias após a infestação artificial das plantas com lagartas de 1º ínstar. As cultivares diferiram significativamente (P=0,05) apenas com relação aos danos, destacando-se AG-510 como a mais resistente, com dano médio de 5,41 em comparação com CMS-35 e AG-106, as mais suscetíveis, com danos médios de 8,38 e 7,85 respectivamente. Foram determinadas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Fall armyworm; Plant resistance; Foliar damage; Larvae survival. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000300015 |
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| Polanczyk,Ricardo Antonio; Silva,Rogério Fernando Pires da; Fiuza,Lidia Mariana. |
| The fall armyworm (Spodoptera frugiperda) is one of the most important pests of maize, causing up to 20% production losses when defoliation occurs near to flowering, or even complete destruction of plants. Among the alternatives to control this pest, the use of Bacillus thuringiensis (Bt) has gained attention due to its efficiency and low impact on natural enemies. Strains Bt dendrolimus HD 37, Bt aizawai HD 68, Bt kurstaki HD 73, Bt darmstadiensis HD 146, and Bt thuringiensis 4412 were tested against second instar larvae in in vivo assays. Suspensions of Bt aizawai HD 68 and Bt thuringiensis 4412, containing 3 x 10(8) cells/ml, induced mortality of 100% and 80.4%, respectively. To test virulence, cell concentrations of 8 x 10(5) to 3 x 10(8) cells/ml of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacillus thuringiensis; Spodoptera frugiperda; Biological control; Bioassays; Fall armyworm. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822000000300003 |
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| Polanczyk,Ricardo Antonio; Alves,Sérgio Batista. |
| The bacterium Bacillus thuringiensis (Bt) is a promising control agent of Spodoptera frugiperda (J.E. Smith). Besides the lethal effect on hosts, the entomopathogen may cause physiological alterations that hinder insects' feeding intake and reproduction. Larval and female pupa weight, oviposition and egg fecundity were determined in second instar S. frugiperda larvae infected with 39 Bt isolates in four bioassays. Sublethal effects were observed in the follow isolates: ESALQ 1.1, ESALQ 1.4, ESALQ 1.6, ESALQ 3.7, ESALQ 4.2 and ESALQ 5.2 (larval and female pupae weight); ESALQ 5.1 (larval weight); ESALQ 1.2 and ESALQ 3.7 (egg fecundity); ESALQ 3.7 (oviposition and egg fecundity); ESALQ 3.7 and ESALQ 5.2 (oviposition). Significant correlations were observed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Entomopathogen; Fall armyworm; Sublethal effects. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500009 |
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| Zenner,Ingeborg; Álvarez,Alonso; Barreto,Sandra. |
| The egg-larval parasitoid Chelonus insularis Cresson is a key parasitoid of the fall armyworm Spodoptera frugiperda (J. E. Smith) during the second field generation in the upper Magdalena River Basin, Colombia. In spite of selection pressure, the higher susceptibility of the second generation fall armyworm larvae to insecticides, compared with that of the first generation, suggests that the parasitism may be responsible for the apparent difference in susceptibility. Parasitized and non-parasitized 2nd-instar larvae of the fall armyworm were tested for susceptibility to chlorpyriphos, methomyl, cypermethrin, and Bacillus thuringiensis in the laboratory, using the leaf dip test. Parasitized larvae were up to 3.93 times more susceptible to chlorpyriphos, 3.71... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fall armyworm; Egg-larval parasitoid; Insecticide resistance; Integrated pest management. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2006000600015 |
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| Farias,Paulo R.S.; Barbosa,José C.; Busoli,Antonio C.; Overal,William L.; Miranda,Vicente S.; Ribeiro,Susane M.. |
| The fall armyworm, Spodoptera frugiperda (J.E. Smith), is one of the chief pests of maize in the Americas. The study of its spatial distribution is fundamental for designing correct control strategies, improving sampling methods, determining actual and potential crop losses, and adopting precise agricultural techniques. In São Paulo state, Brazil, a maize field was sampled at weekly intervals, from germination through harvest, for caterpillar densities, using quadrates. In each of 200 quadrates, 10 plants were sampled per week. Harvest weights were obtained in the field for each quadrate, and ear diameters and lengths were also sampled (15 ears per quadrate) and used to estimate potential productivity of the quadrate. Geostatistical analyses of caterpillar... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Fall armyworm; Semivariogram; Kriging. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2008000300012 |
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| Barros,Eduardo M; Torres,Jorge B; Bueno,Adeney F. |
| The host selection for oviposition by Spodoptera frugiperda (J.E. Smith) among corn, millet, cotton and soybean, and its relationship with the biological characteristics were investigated. Free and non-choice tests for oviposition using plots containing five plants each, from each host in plastic greenhouse, resulted in similar oviposition preference among the host plants. In addition, selected biological characteristics of S. frugiperda were determined in the laboratory with larvae feeding on host leaves, and the combination of leaf and cotton boll. Neonate larvae exhibited low success of colonization on cotton boll compared to the leaves of all other hosts. Spodoptera frugiperda fed only on cotton bolls exhibited longer larval and pupal development, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fall armyworm; Oviposition behavior; Host selection; Fertility life table. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000600023 |
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| Santos-Neto,Joaquim R; Mezencio,Jose M S; Chagas,Aline T A; Michereff-Filho,Miguel; Serrão,José E. |
| Spodoptera frugiperda (J E Smith) is an important pest of several crops, but especially on maize in Brazil. The implementation of biological control measures hinges on the identification of its predators and other natural enemies. As a means of identifying predators, antibodies against S. frugiperda eggs were generated by inoculating rabbits with macerated S. frugiperda eggs, and the production of antibodies against S. frugiperda egg proteins was verifi ed by double immunodiffusion (DID). These antibodies were then utilized in another serological technique, counterimmunoeletrophoresis (CIE), to identify insects that could have ingested S. frugiperda eggs. Macerates of entire insects collected in maize plantations and of individual parts of their digestive... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fall armyworm; Natural enemy; Double immunodiffusion; Counterimmunoelectrophoresis. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000300016 |
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| Roel,Antonia Railda; Dourado,Doroty M.; Matias,Rosemary; Porto,Karla R. A.; Bednaski,Aline V.; Costa,Reginaldo B. da. |
| The fall armyworm, Spodoptera frugiperda, is one of the major field pests for maize production. It is mainly controlled by means of synthetic, and more recently by resistant cultivar of maize expressing Bt toxins. The neem tree, Azadirachta indica, is a plant that can potentially control insects with the advantage of being food and environmental safe. The aim of this study was to assess the effect of neem oil on the development and survival of S. frugiperda caterpillars by assessing histological alterations caused on their midgut. Newly hatched caterpillars were submitted to three neem oil concentrations: 0.006; 0.05; 0.4%, which were added to their artificial diet. Ten 3rd instar caterpillars, taken from each treatment, were submitted to histological... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fall armyworm; Histological analysis; Insecticidal plants; Neem. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262010000300024 |
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| Carneiro,Tatiana R.; Fernandes,Odair A.; Cruz,Ivan; Bueno,Regiane C. O. F.. |
| Functional response of Telenomus remus Nixon (Hymenoptera, Scelionidae) to Spodoptera frugiperda (J. E. Smith) (Lepidoptera, Noctuidae) eggs: effect of female age. Functional response of 24-h and 48-h-old Telenomus remus adults was studied on Spodoptera frugiperda eggs. The study was carried out in climatic chamber regulated at 25 ± 1°C, 70 ± 10% RH and 12:12h (L: D). Females of T. remus were honey fed and individualized in glass vials along with 25, 50, 75, 100, 150, 200, 250 or 300 eggs of S. frugiperda for 24 h. Complete randomized design with ten replications was adopted. The parameters evaluated to construct the functional response curve were daily average parasitism, searching rate and oviposition time. It was observed that the higher the egg... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biological control; Fall armyworm; Oviposition time; Parasitoid; Search rate. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262010000400023 |
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| Bueno,Regiane Cristina Oliveira de Freitas; Bueno,Adeney de Freitas; Parra,José Roberto Postalli; Vieira,Simone Silva; Oliveira,Luciele Januário de. |
| This study aimed at evaluating the biological characteristics and the capacity of parasitism of a Trichogramma pretiosum Riley, 1869 (Hymenoptera, Trichogrammatidae) strain (T. pretiosum RV) collected in Rio Verde County, State of Goiás, Brazil. The study was carried out on eggs of Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera, Noctuidae) and conducted under controlled environmental conditions at different constant temperatures. The biological parameters determined were: developmental time (egg-adult; days); emergence (%); sex ratio; number of progeny/egg; number of generation/year; thermal constant (K); temperature threshold (Tb); daily number of parasitized eggs; cumulative parasitism (%); total number of eggs parasitized by T. pretiosum; and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biological control; Egg parasitoids; Fall armyworm; Temperature. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262010000200016 |
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| Registros recuperados: 40 | |
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