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| Registros recuperados: 26 | |
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| Henz,Gilmar P.; Lopes,Carlos A.; Reis,Ailton. |
| Okra pods with unusual brown lesions and rot were collected in a local supermarket in Brasília DF. The objective of this paper was to characterize the causal agent, to fulfill Koch's postulates and to determine some conditions conducive to disease. The pathogen was identified as Rhizoctonia solani based on morphological characteristics which fitted the fungus description, such as pale to brown hyphae, with nearly right-angled side branches constricted at the base, hyphal cells 6-10 µm wide with a septum near the base. Five isolates were obtained from infected pods and identified as AG 1-IB anastomosis group. Wounded or unwounded okra pods cv. Santa Cruz 47 were inoculated with mycelium disks of R. solani and kept in humid chambers at 12 ºC or 25 ºC. After... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Abelmoschus esculentus; Immature fruit; Disease. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582007000300008 |
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| Santos,Gil R.; Café-Filho,Adalberto C.; Reis,Ailton. |
| O crestamento gomoso do caule (Didymella bryoniae) é uma das mais importantes doenças da melancia (Citrullus lanatus) no mundo. O controle químico, embora amplamente adotado, nem sempre pode impedir o progresso da doença no campo. A resistência do agente causal a alguns ingredientes ativos foi relatada na Europa, Japão e nos Estados Unidos, porém nenhum estudo foi feito no Brasil. Este trabalho descreve os resultados de três ensaios in vitro para resistência a fungicidas, medida pela taxa de crescimento micelial. No primeiro ensaio, sete isolados foram submetidos a nove fungicidas na metade da dose comercial recomendada. Evidência de resistência a Tiofanato metílico (TM), Carbendazim (CARB) (benzimidazóis) bem como a mistura Tiofanato metílico +... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Benzimidazóis; Sensibilidade a fungicidas; Ascochyta cucumis. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582006000500007 |
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| Reis,Ailton; Boiteux,Leonardo S.; Paz-Lima,Milton L.; Silva,Patrícia P.; Lopes,Carlos A.. |
| A powdery mildew disease was observed on leaves of Solanum gilo, S. melongena, S. tuberosum S. chacoense, Nicotiana rustica and N. tabacum in Brasília (Federal District), Brazil. Symptoms were mainly characterized by adaxial yellow areas in the leaves corresponding to white fungal colonies on the abaxial surface. Profuse sporulation was often observed. Light microscopy of the fungal colonies revealed the presence of conidiophores emerging through stomata with some having two or three branches. Ellipsoidal, subhyaline conidia were predominantly born singly and terminally on the conidiophore. All morphometrical characteristics agreed with those of Oidiopsis haplophylli (Syn. O. sicula). The teleomorph (Leveillula taurica) was not observed. Inoculation tests... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Etiology; Solanum gilo; S. melongena; S. tuberosum; S. chacoense; Nicotiana tabacum; N. rustica; Powdery mildew; Leveillula taurica. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000200017 |
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| Reis,Ailton; Costa,Hélcio; Boiteux,Leonardo S.; Lopes,Carlos A.. |
| Fusarium wilt, caused by three races of Fusarium oxysporum f. sp. lycopersici, is one of the most important diseases of tomato (Lycopersicon esculentum). Races 1 and 2 are distributed worldwide whereas race 3 has a more limited geographic distribution with no report thus far in Brazil. Seven F. oxysporum isolates were obtained from wilted tomato plants of race 1 and 2-resistant hybrids 'Carmen' and 'Alambra' in Venda Nova do Imigrante (State of Espírito Santo), Brazil. Virulence assays were performed using a set of the race differential cultivars: 'Ponderosa' (susceptible to all races), 'IPA-5' (resistant to race 1), 'Floradade' (resistant to races 1 and 2) and 'BHRS-2,3' (resistant to race 3). All isolates were highly virulent to 'Ponderosa', 'IPA-5' and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fusarium wilt; Lycopersicon; Pathogen variability. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000400017 |
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| Registros recuperados: 26 | |
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