Consulta: creatorFacets:"Luz,Christian"
Registros recuperados: 4
Data/hora: 13/06/2024 14:30:37

Detection of entomopathogenic fungi in peridomestic triatomine-infested areas in central Brazil and fungal activity against Triatoma infestans (Klug) (Hemiptera: Reduviidae)
Provedor de dados: 82
Autores: Luz,Christian; Rocha,Luiz F.N.; Nery,Gustavo V.
From 148 substrate samples collected in peridomestic triatomine-infested habitats of 24 farms in Central Brazil, 31 isolates of Metarhizium anisopliae (Metsch.) Sorok. and 15 isolates of Beauveria bassiana (Bals.) Vuill. were obtained. Most of the isolates were found in substrates that consisted of soil mixed with animal feces or soil only in areas of trees where poultry roost and pig houses. Fungi were detected with an insect bait method using Triatoma infestans (Klug), and combined in vitro and in vivo techniques with modified Chase medium and T. infestans. All isolates were highly virulent to T. infestans third instar nymphs at a relative humidity &gt; 98% and temperature of 25 ± 0.5°C. However, activity against nymphs was reduced at 75% relative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triatominae; Beauveria bassiana; Metarhizium anisopliae; Peridomestic; Occurrence.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2004000600017

Control of Triatoma infestans (Klug) (Reduviidae: Triatominae) with Beauveria bassiana (Bals.) Vuill.: preliminary assays on formulation and application in the field
Provedor de dados: 44
Autores: Luz,Christian; Silva,Ionizete G.; Magalhães,Bonifácio P.; Cordeiro,Celia M. T.; Tigano,Myrian S.
Beauveria bassiana (Bals.) Vuill., isolate CG 306, was assayed against Triatoma infestans (Klug) using indirect application by contact with a treated filter paper. The fungus was deposited on filter paper by vacuum-filtration of a conidial suspension. Estimates of 50% survival time of insects were between 15 and 21 days at 3x10(6) and 10(7) conidia/cm² of treated support, respectively, without significant difference between concentrations. A concentration of 2.4x10(6) conidia/cm² of CG 306 was necessary to kill 50% of T. infestans third instar nymphs 25 days after inoculation at 25°C and 50% relative humidity, when insects were continuously exposed to conidia. The LC50 was significantly higher (2.0x10(7) conidia/cm²) when insects were exposed for 1 h to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Chagas disease; Biological control; Hyphomycetes.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80591999000100011

Effect of deltamethrin on germination and virulence of Beauveria bassiana (Bals.) Vuill. on Triatoma infestans (Klug)
Provedor de dados: 44
Autores: Alzogaray,Raul; Luz,Christian; Silva,Ionizete G.; Lecuona,Roberto E.; Tigano,Myrian S.
Foi avaliada a ação do inseticida deltametrina sobre a capacidade de germinação e virulência do fungo entomopatogênico Beauveria bassiana (Bals.) Vuill. contra ninfas de 3° estádio de Triatoma infestans (Klug) (Hemiptera: Reduviidae). Após 12 horas em cultura submersa, observou-se uma diminuição significativa da germinação de conídios de B. bassiana em proporção ao aumento da concentração do inseticida. Na mais alta dose aplicada, 550 mmg/ml, foi observado retardamento da germinação com 24 e 36 horas e interrupção do desenvolvimento do fungo após esse tempo. A exposição de ninfas de 3° estádio a concentrações subletais de deltametrina não alterou de forma significativa a virulência de B. bassiana.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Fungo entomopatogênico; Piretróide; Manejo integrado de pragas.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80591998000400022

Beauveria bassiana: quercetinase production and genetic diversity
Provedor de dados: 58
Autores: Costa,Eula Maria de M. B; Pimenta,Fabiana Cristina; Luz,Christian; Oliveira,Valéria de; Oliveira,Marília; Bueno,Elda; Petrofeza,Silvana.
Beauveria bassiana genetic diversity and ability to synthesize quercetin 2,3-dioxygenase (quercetinase) were analyzed. B. bassiana isolates, obtained from Brazilian soil samples, produced quercetinase after induction using 0.5 g/L quercetin. B. bassiana ATCC 7159 (29.6 nmol/mL/min) and isolate IP 11 (27.5 nmol/ml/min) showed the best performances and IP 3a (9.5 nmol/mL/min) presented the lowest level of quercetinase activity in the culture supernatant. A high level of polymorphism was detected by random amplified polymorphic DNA (RAPD) analysis. The use of internal-transcribed-spacer ribosomal region restriction fragment length polymorphism (ITS-RFLP) did not reveal characteristic markers to differentiate isolates. However, the ITS1-5.8S-ITS2 region...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beauveria bassiana quercetinase quercetin-2; 3-dioxygenase genetic diversity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000100002