Entomopathogenic nematodes (Heterorhabditidae and Steinernematidae), to control Triatoma infestans populations (Hemiptera: Reduviidae), Chagas disease vector

[Display omitted] •Triatoma infestans was susceptible to Steinernematidae and Heterorhabditidae strains.•Both resistant and non-resistant kissing bugs were susceptible to EPNs.•The EPN strains were able to multiply and emerge as IJ from T. infestans cadavers.•Median survival time ranged from 1.5 and...

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Bibliographic Details
Published in:	Biological control Vol. 165; p. 104814
Main Authors:	Eliceche, Daiana Pamela, Achinelly, María Fernanda, Silvestre, Carlos, Micieli, María Victoria, Marti, Gerardo Aníbal
Format:	Journal Article
Language:	English
Published:	Elsevier Inc 01-02-2022
Subjects:	Biological control Chagas disease Entomopathogenic nematodes Pyrethroid resistant and non-resistant Triatoma infestans populations Chagas disease Pyrethroid resistant and non-resistant Triatoma infestans populations Entomopathogenic nematodes Biological control
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Summary:	[Display omitted] •Triatoma infestans was susceptible to Steinernematidae and Heterorhabditidae strains.•Both resistant and non-resistant kissing bugs were susceptible to EPNs.•The EPN strains were able to multiply and emerge as IJ from T. infestans cadavers.•Median survival time ranged from 1.5 and 3 days.•Nymph survival decreased with all EPN strains evaluated. Pyrethroid insecticides are the only strategy to control Triatoma infestans populations (Hemiptera: Reduviidae), the main vector of Chagas disease in Argentina. However, toxicity effects and resistance have resulted from repeated applications of these insecticides over long periods. The aim of this study was to evaluate the efficacy of three isolates of entomopathogenic nematodes (EPN): Heterorhabditis bacteriophora (RN and SUP strains) and Steinernema feltiae (NEMAPOM), against pyrethroid-resistant and non-resistant T. infestans populations. Survival of pyrethroid-resistant and non-resistant T. infestans nymphs was significantly reduced in those parasitized by EPN strains compared to the controls, reaching values close to 10%, three and six days after exposure to Heterorhabditis and Steinernema, respectively. The lowest survival of T. infestans nymphs resulted from application of H. bacteriophora strains. No significant differences were observed between pyrethroid-resistant and non-resistant T. infestans populations for any of the parameters evaluated. The three strains were able to multiply and emerge as infective juveniles (IJs) from T. infestans cadavers, completing their lifecycle in both pyrethroid-resistant and non-resistant populations, but highest IJ production was observed in H. bacteriophora strains. Future studies should consider the incorporation of drought-tolerant EPN strains, as well as evaluating an adequate release strategy before field implementation of EPNs as biological control agents of T. infestans.
ISSN:	1049-9644 1090-2112
DOI:	10.1016/j.biocontrol.2021.104814