Frequency of resistance alleles to Lysinibacillus sphaericus in a Culex quinquefasciatus population treated with a L. sphaericus/Bti biolarvicide

Santos, Eloína Maria de Mendonça; Chalegre, Karlos Diogo de Melo; Albuquerque, Alessandra Lima de; Regis, Lêda; Oliveira, Cláudia Maria Fontes de; Silva-Filha, Maria Helena Neves Lobo

doi:10.1016/j.biocontrol.2019.02.006

Cited by 5 publications

(1 citation statement)

References 49 publications

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“…Bti (i) is scarcely persistent, especially in polluted and organically enriched water, and requires multiple applications 11 , 29 however (ii) produces a blend of toxins (several Cry and Cyt toxins) and resistance outbreaks have never been registered, although a mild decrease in susceptibility and resistance to single toxins have been described 28 , 29 . Conversely, Ls (i) persists longer and recycle in the environment through infected larvae but (ii) insects are more prone to develop resistance to the binary toxin (Bin) responsible for its acute toxicity 26 , 30 . To avoid resistance spread no formulates with Ls alone are available on the market, whereas bioinsecticides based on both Bti and Ls have been developed to synergize the toxic effects of both and to partially compensate the lack of persistence of Bti .…”

Section: Introductionmentioning

confidence: 99%

MosChito rafts as effective and eco-friendly tool for the delivery of a Bacillus thuringiensis-based insecticide to Aedes albopictus larvae

Pitton

Negri

Pezzali

et al. 2023

Sci Rep

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Adult mosquito females, through their bites, are responsible for the transmission of different zoonotic pathogens. Although adult control represents a pillar for the prevention of disease spread, larval control is also crucial. Herein we characterized the effectiveness of a suitable tool, named “MosChito raft”, for the aquatic delivery of a Bacillus thuringiensis var. israelensis (Bti) formulate, a bioinsecticide active by ingestion against mosquito larvae. MosChito raft is a floating tool composed by chitosan cross-linked with genipin in which a Bti-based formulate and an attractant have been included. MosChito rafts (i) resulted attractive for the larvae of the Asian tiger mosquito Aedes albopictus, (ii) induced larval mortality within a few hours of exposure and, more importantly, (iii) protected the Bti-based formulate, whose insecticidal activity was maintained for more than one month in comparison to the few days residual activity of the commercial product. The delivery method was effective in both laboratory and semi-field conditions, demonstrating that MosChito rafts may represent an original, eco-based and user-friendly solution for larval control in domestic and peri-domestic aquatic habitats such as saucers and artificial containers in residential or urban environments.

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