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| Registros recuperados: 15 | |
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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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| Alves,Luis Francisco Angeli; Alves,Sérgio Batista; Lopes,Rogério Biaggioni; Augusto,Nílson Toschi. |
| O objetivo deste trabalho foi avaliar a estabilidade de uma formulação granulada de Bacillus sphaericus à base de sabugo de milho, armazenada em condições ambientais e a 50°C, tendo como comparação, uma suspensão concentrada de esporos e cristais da bactéria. A análise periódica dos materiais armazenados revelaram o efeito protetor da formulação sobre o microrganismo, de forma que ao longo de 12 meses de armazenamento, em condições ambiente, a viabilidade dos esporos foi maior que na suspensão concentrada. Além disso, a atividade inseticida para larvas de Culex quinquefasciatus, avaliada nos criadouros artificiais foi comparável ao patógeno não formulado. Quando mantidos a 50°C, a ação protetora da formulação mostrou-se mais eficiente, sendo que ao final... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Culex quinquefasciatus; Entomopatógeno; Controle microbiano; Culex quinquefasciatus; Entomopathogen; Microbial control. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100004 |
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| Haddad,Marinéia de Lara; Polanczyk,Ricardo Antonio; Alves,Sergio Batista; Garcia,Marcelo de Oliveira. |
| The persistence slope of Bacillus thuringiensis (Bt) based products in the field is an important parameter to evaluate their efficacy. The half-life, estimated based on persistence slope parameters, is one of the most effective tools to select microbial pesticides. The aim of this research was to study the relationship between viability loss of Bt spores on maize leaves and their concentration, comparing it with field persistence. The experimental design was split-plot on time, composed by maize plants, in which three concentrations (half, normal and double doses) of a Dipel commercial formulation were applied. In each plot three leaves in the upper part of three plants where randomly selected. Samples of these leaves were collected 3 to 72 hours after... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Entomopathogen; Dipel; Maize leaves; Bacillus thuringiensis; Field persistence. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000400001 |
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| Polanczyk,Ricardo Antonio; Zanúncio,José Cola; Alves,Sérgio Batista. |
| The soil and other substrates such as mushroom compounds are the main sources of new Bacillus thuringiensis (Bt) isolates for Integrated Pest Management programs. This study describes the relationship between chemical properties of the soil (pH, OM, P3+, K1+, Ca2+, Mg2+, H1++Al3+, B3+, Cu2+, Fe2+, Mn2+ and Zn2+) and the occurrence of Bt in Brazil. A total of 1,197 bacterial colonies were obtained, being 512 of them identified as Bt. The Bt index (iBt), which is the relation between Bt colonies and bacterial counts ranged from 0.18 to 0.86. The iBt may be expressed with the formula: iBt= -0.4 + 0.6Ca2+ + 0.07Cu2+ + 0.009Fe2+ - 0.53Mg2+ -0.12Mn2+ + 1.26Zn2+. A cluster of samples with fewer colonies and a high negative correlation (antagonism) between Mn2+... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bt; Chemical elements; Entomopathogen; Soil; Biological control. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782009000100001 |
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| GUIMARÃES,JENNIFER; MARQUES,EDMILSON J.; WANDERLEY-TEIXEIRA,VALÉRIA; ALBUQUERQUE,AURISTELA C. DE; PASSOS,ELIANA M. DOS; SILVA,CÍNTHIA C.M.; TEIXEIRA,ÁLVARO A.C.. |
| This work aimed to evaluate the effects of Metarhizium anisopliae on Diatraea flavipennella and investigate their immune response. Was observed the effect of M. anisopliae against larvae of D. flavipennella sprayed at concentrations of 103, 104, 105 conidia / mL, in which showed differences relative the larval period, extending up to 72.0 days in treatment and 25.0 days in the control. The results for hemocytes revealed that the most frequent cells when sprayed at the concentrations of 103, 105, 107 conidia / mL were the prohemocytes, spherulocytes, plasmatocytes and granulocytes in relation to adipohemocytes and oenocytoids. The level of nitric oxide was different between the control and the concentration 107 spores / mL (24), while the activity of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Entomopathogen; Hemocytes; Histochemistry; Nitric oxide; Phenoloxidases; Sugarcane borer. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401973 |
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| Registros recuperados: 15 | |
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