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- Title
Novel combination of a biosurfactant with entomopathogenic fungi enhances efficacy against Bemisia whitefly.
- Authors
Nascimento Silva, Jaqueline; Mascarin, Gabriel M; Paula Vieira de Castro, Rui; Castilho, Leda R; Freire, Denise MG
- Abstract
BACKGROUND: Microbial surfactants are multifunctional surface‐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. RESULTS: 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 × 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 + RML (51.4% mortality). CONCLUSION: Our results show that this bacterium‐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
- Subjects
ENTOMOPATHOGENIC fungi; BEAUVERIA bassiana; SOCIETY of Chemical Industry (Great Britain); FUNGAL spores; SWEETPOTATO whitefly; INSECT pests; ALEYRODIDAE; INSECT nematodes; CONIDIA
- Publication
Pest Management Science, 2019, Vol 75, Issue 11, p2882
- ISSN
1526-498X
- Publication type
Article
- DOI
10.1002/ps.5458