Data/hora: 06/06/2024 10:05:08

Biblioteca(s): | Embrapa Meio Ambiente.
Data corrente: | 26/11/2019
Data da última atualização: | 29/11/2019
Autoria: | SILVA, J. do N.; MASCARIN, G. M.; CASTRO, R. de P. V. de; CASTILHO, L dos R.
Afiliação: | JAQUELILNE DO NASCIMENTO SILVA, UFRJ; GABRIEL MOURA MASCARIN, CNPMA; RUI DE PAULA VIEIRA DE CASTRO, UFRJ; LEDA DOS REIS CASTILHO, UFRJ.
Título: | Novel combination of a biosurfactant with entomopathogenic fungi enhances efficacy against Bemisia whitefly.
Ano de publicação: | 2019
Fonte/Imprenta: | Pest Management Science, v. 75, n. 11, p. 2882-2891, 2019.
DOI: | https://doi.org/10.1002/ps.5458
Idioma: | Inglês
Conteúdo: | Abstract: Microbial surfactants are multifunctional surface&#8208;active molecules that have been overlooked in formulating microbial biopesticides. We report a novel approach using the biosurfactant rhamnolipid (RML) against the destructive cosmopolitan insect pest Bemisia tabaci, as well as the combined action of RML with aerial conidia of two entomopathogenic fungi, Cordyceps javanica and Beauveria bassiana. RML was also tested as a suspension agent to improve the recovery rate of conidia from solid substrate for fungal preparations. The recovery rate of conidia increased dramatically (two to five times) with RML compared with a standard surfactant (Tween 80). Spraying solutions of 0.075% and 0.1% (w/v) RML on B. tabaci third instar nymphs induced 100% mortality within 4 days. Conidial suspensions at 5&#8201;×&#8201;106 conidia/mL amended with RML at 0.01% or 0.05% markedly increased nymphal mortalities and considerably reduced LC50. Conidial suspensions of B. bassiana with 0.05% RML added were more effective against whitefly nymphs (87.3% mortality) than C. javanica&#8201;+&#8201;RML (51.4% mortality). Our results show that this bacterium&#8208;based RML improved the recovery rate of hydrophobic conidia, and that mixtures of RML with fungal spore suspensions increased their insecticidal activity. © 2019 Society of Chemical Industry.
Palavras-Chave: | Rhamnolipid.
Thesagro: | Bemisia Tabaci; Controle Biológico; Fungo Entomógeno; Mosca Branca.
Thesaurus Nal: | Biological control; Biosurfactants; Cordycipitaceae; Entomopathogenic fungi.
Categoria do assunto: | H Saúde e Patologia
Registro original: | Embrapa Meio Ambiente (CNPMA)
Exemplares: | CNPMA - (16529-1) - UPC - AP - DD -  -  -  - DIS