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| Registros recuperados: 243 | |
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| JUNQUEIRA, N. T. V.; BEZERRA, J. L.. |
| Foi constatado, no Campo Experimental do CNPSD, um fungo Ascomiceto, Dothideaceae, identificado como Rosenscheldiella sp., formando estromas escuros na face abaxial de foliolos de seringueira no estagio D. A doenca tem sido denominada de "falsa crosta negra", quando isolada em folhas, ou "complexo crosta negra", quando associada a crostas de Phyllachora huberi. Ate o momento, tem sido verificado que Rosenscheldiella sp. so coloniza tecidos previamente infectados ou inicialmente colonizados por P. huberi. O controle dessa doenca pode ser feito com apenas duas pulverizacoes, a intervalos de dez dias, com a mistura de alguns fungicias. |
| Tipo: Comunicado Técnico (INFOTECA-E) |
Palavras-chave: Rosenscheldiella; Complexo crosta negra; Brasil; Amazonas; Rubber tree; Fungal diseases.; Controle Químico; Doença; Espécie; Falsa Crosta Negra; Fungo; Folha; Hevea; Seringueira.; Chemical control; Leaves.. |
| Ano: 1986 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/665249 |
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| Rondelaud, D. |
| The treated habitats have not been recolonized by Lymnaea truncatula . Four aquatic snail species showed an increase in their numbers: L. glabra in the stations of Haute-Vienne, L. glabra, Physa acuta, P. hypnorum and Planorbis rotundatus in the habitats of Indre. The numbers of L. glabra and P. acuta reached their maximum on the third year and decreased thereafter; those of P. hypnorum and P. rotundatus slightly increased from the fourth or the fifth years treatment. The colonization of L. truncatula habitats was incomplete and did not reach over 50% of the surface for L. glabra and P. acuta , 20% for P. hypnorum and P. rotundatus . The bivalve Pisidium casertanum did not recolonize treated habitats. There were no modifications in the numbers of... |
| Tipo: Text |
Palavras-chave: Physa; Lymnaea; Mollusca; Biological control; Chemical control; Population density; Population dynamics; Freshwater molluscs. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/1991/acte-1715.pdf |
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| Santos,VC; Siqueira,HAA de; Silva,JE da; Farias,MJDC de. |
| The diamondback moth Plutella xylostella (L.) has a great economic importance in Brassicaceae crops in many parts of the world. Recurrent infestations of this pest in growing areas of Pernambuco state, Brazil, have led farmers to frequently spray their crops with insecticides. However, control failures by several insecticides have been alleged by farmers. The objective of this study was to check whether resistance to insecticides could explain these control failures in P. xylostella. Populations of P. xylostella from Pernambuco were collected between January and April 2009. The resistance ratios of P. xylostella populations were compared among five different active ingredients: abamectin, methomyl, lufenuron, indoxacarb, and diafenthiuron by leaf dipping... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Insect; Chemical control; Survey; Leaf-dipping bioassay; Lethal ratio. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000200017 |
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| Madaleno,Leonardo L.; Ravaneli,Gisele C.; Presotti,Leandro E.; Mutton,Miguel A.; Fernandes,Odair A.; Mutton,Márcia J.R.. |
| Mahanarva fimbriolata (Stål) is an important pest in Latin America and causes significant reduction in sugarcane productivity. There is no information regarding the effect of this pest on the quality of cane juice used for sugar and alcohol production. This work aimed at evaluating the quality of sugarcane juice from plants attacked by spittlebugs. The experiment was arranged in a completely randomized design with 15 replications, and comprised two treatments: control and chemical treatment with thiamethoxam. An average of 9.2 ± 4.44 spittlebug nymphs m-1 were found in the plots prior to insecticide application. Nymphs were counted 18, 35, 55, and 82 days after the initial sampling (december/2003). During the mid growing season (July 2004), the juice was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spittlebug; Insect-day; Chemical control. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2008000100010 |
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| Sato,Mário E.; Silva,Marcos Z. da; Raga,Adalton; Souza Filho,Miguel F. de. |
| Studies on artificial laboratory selections with abamectin, cross-resistance relationships, and stability of resistance were carried out with Tetranychus urticae Koch to provide basic information for an abamectin resistance management program. Selections for resistance and susceptibility to abamectin were performed in a population of T. urticae, collected from a commercial strawberry field in the State of São Paulo, Brazil. After five selections for resistance and five selections for susceptibility, susceptible (S) and resistant (R) strains of T. urticae to abamectin were obtained. The resistance ratio (R/S) at the LC50 reached 342-fold values. The toxicity of eight acaricides was evaluated in the R and S strains, observing significant differences (at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Two-spotted spider mite; Resistance management; Chemical control. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2005000600016 |
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| Bizi, Rafaela Mazur; Grigoletti Júnior, Albino Garcia; Auer, Celso Garcia. |
| The objective of this study was to find effective fungicides against eucalypt powdery mildew. Fungicides tested were chlorothalonil, fenarimol, sulfur, tebuconazole, propiconazole, benzothiazole, pyraclostrobin + epoxiconazole and triadimenol. These fungicides were sprayed on Eucalyptus benthamii seedlings in a greenhouse infested with powdery mildew. Severity was evaluated at 9, 16, 23, 30 and 37 days after spraying, classifying symptoms observed with a scale 0 (symptoms absent) to 4 (strong symptoms). Best treatments were obtained with pyraclostrobin + epoxiconazole, propiconazole + trifloxystrobin and triadimenol, with an infection index average of 0.39, 0.63 and 1.01, respectively. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chemical control; Disease; Eucalyptus benthamii controle químico; Doença; Eucalyptus benthamii. 1. |
| Ano: 2011 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/234 |
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| Garlet, Juliana; Costa, Ervandil Corrêa; Boscardin, Jardel; Machado, Dayanna Nascimento; Pedron, Leandra; Machado, Leonardo Mortari. |
| The aim of this study was to investigate the effect of different chemical control of alternative weed in soil fauna in initial planting of Eucalyptus grandis. The treatments consisted of partial and full control of the weed vegetation. Collections were conducted through soil trap (pitfall). We collected 26,136 specimens, distributed in 13 taxonomic groups (Araneae, Blattodea, Chilopoda, Collembola, Coleoptera, Diplopoda, Diptera, Hemiptera, Hymenoptera, Termitoidea, Orthoptera, Opilione and young forms). The treatments with remaining weed vegetation presented higher values of evaluated indices. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chemical control; Forest plantations; Edaphic arthropods Recursos Florestais Engenharia Florestal Silvicultura Proteção Florestal Controle químico; Plantação florestal; Artrópodos edáficos. |
| Ano: 2017 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/970 |
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| Sosa-Gómez,Daniel Ricardo; Silva,Jovenil José da. |
| The objective of this work was to evaluate the soybean neotropical brown stink bug (Euschistus heros) resistance to methamidophos through laboratory bioassays. Bioassays were carried out using populations of adults and nymphs of Euschistus heros in the last instar collected in soybean crops in Paraná State. Highest frequencies of genotypes resistant to methamidophos were observed in Alvorada do Sul, Toledo and Nova Santa Rosa, PR. Populations from Bela Vista do Paraíso, Araruna, Campo Mourão, Mariluz, Cascavel, São João do Ivaí, and Mamboré were more susceptible to methamidophos. However, an increase on resistant genotypes in this locations cannot be discarded. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Chemical control; Insecticide resistance; Susceptibility. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000700019 |
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| Godoy,Cláudia Vieira; Seixas,Claudine Dinali Santos; Soares,Rafael Moreira; Marcelino-Guimarães,Franscismar Correa; Meyer,Maurício Conrado; Costamilan,Leila Maria. |
| Abstract: Asian soybean rust, caused by the fungus Phakopsora pachyrhizi, is the most severe disease of the crop and can cause yield losses of up to 90%. The disease was first reported in Brazil in 2001. Epidemics of the disease are common in the country, where the fungus can survive year-round. Regulatory measures to reduce the inoculum between seasons and avoid late-season soybean have been adopted to manage the disease. Disease control has relied mainly on chemical control, but a lower sensibility of the fungus to fungicides has been reported in Brazil. Major-resistance genes have been mapped and incorporated into the cultivars. With the reduced efficacy of the fungicides, the adoption of integrated measures to control the disease will be important for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Phakopsora pachyrhizi; Biotechnology; Chemical control; Genetic resistance; Losses; Management.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000500407 |
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| Prabhu,Anne Sitarama; Filippi,Marta Cristina; Zimmermann,Francisco José Pfeilsticker. |
| Four field trials were conducted, from 1995 to 1997, with the objective of studying the response of four upland cultivars to foliar fungicide application in relation to panicle blast control, grain yield and sustainability. Differential disease control and yield response of cultivars to fungicide treatment were obtained. Losses in grain yield of cultivars IAC 202, Caiapó, Rio Paranaíba and Araguaia due to panicle blast were 44.8%, 27.4%, 24.4% and 18.2%, respectively. Two applications of tricyclazole or benomyl controlled panicle blast, as indicated by lower values of disease progress curve and relative panicle blast severity, and increased grain yield of the cultivar IAC 202. The losses in 100 panicle grain weight and grain yield were significantly... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Yield factors; Pest control; Chemical control. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003000100002 |
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| CORREIA,N.M.; RESENDE,Í.. |
| ABSTRACT: In agricultural areas of Brazil, where there is no establishment of cover crops in the off-season and in fruit orchards, an increase in Chloris elata infestations, syn. Chloris polydactyla, has been observed. With the purpose to evaluate the response of three populations (Itaberaí - GO, Matão - SP e Jaboticabal - SP) of C. elata to herbicides sprayed before and after emergence, four experiments were conducted. In the first one, the differential tolerance of three C. elata populations to the herbicide glyphosate (0, 0.18, 0.36, 0.72, 0.96, 1.44, 2.88, 5.76 and 11.52 kg a.e. ha-1) was studied. In the other experiments, the control of the three populations by herbicides applied in pre-emergence (clomazone, diclosulam, flumioxazin, isoxaflutole,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biotype; Tall windmill grass; Chemical control; Weed. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100277 |
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| Registros recuperados: 243 | |
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