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Activity of flonicamid on the sweet potato whitely Bemisia tabaci (Homoptera: Aleyrodidae) and its natural enemies

Authors

  • Emmanouil Roditakis,

    Corresponding author
    1. Hellenic Agricultural Organisation ‘Demeter’, NAGREF, Plant Protection Institute of Heraklion, Laboratory of Entomology, Heraklion, Greece
    • Correspondence to: Emmanouil Roditakis, Hellenic Agricultural Organisation ‘Demeter’, NAGREF, Plant Protection Institute of Heraklion, PO Box 2228, 71003 Heraklion, Greece. E-mail: eroditakis@nagref.gr

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  • Natasa Fytrou,

    1. Hellenic Agricultural Organisation ‘Demeter’, NAGREF, Plant Protection Institute of Heraklion, Laboratory of Entomology, Heraklion, Greece
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  • Marianna Staurakaki,

    1. Hellenic Agricultural Organisation ‘Demeter’, NAGREF, Plant Protection Institute of Heraklion, Laboratory of Entomology, Heraklion, Greece
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  • John Vontas,

    1. Faculty of Biotechnology and Applied Biology, Department of Biology, University of Crete, Heraklion, Greece
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  • Anastasia Tsagkarakou

    1. Hellenic Agricultural Organisation ‘Demeter’, NAGREF, Plant Protection Institute of Heraklion, Laboratory of Entomology, Heraklion, Greece
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Abstract

BACKGROUND

Flonicamid is a novel systemic insecticide that acts as a feeding blocker with potential use against whiteflies within IPM control tactics. Flonicamid efficacy against Bemisia tabaci Mediterranean populations from Crete was examined, as well as side effects on selected beneficials used extensively in current IPM schemes.

RESULTS

Low variability in adulticide activity was detected (<tenfold), while there was no resistance compared with a reference susceptible population. Flonicamid exhibited low to no insecticidal activity on eggs, emerging crawlers and second-instar nymphs at the maximum registered label rate (RLRmax). In long-term cage experiments, flonicamid at the RLRmax (125 mg L−1) caused 95% mortality to whiteflies 10 days after treatment and delayed population growth by one generation (32 days). Flonicamid significantly delayed nymphal development by increasing the development time (DT50) of treated insects by 7.2 days. Flonicamid did not affect the survival of Eretmocerus eremicus adults, while lethal effects of an intermediate level were observed on Nesidiocoris tenuis adults and nymphs, Amblyseius swirskii adults and preimaginal stages of E. eremicus. Flonicamid reduced the feeding activity (consumption of B. tabaci eggs) of N. tenuis and A. swirskii by 28 and 37% respectively. Moreover, the fecundity of A. swirskii was reduced by 36% after exposure to flonicamid.

CONCLUSIONS

Flonicamid is an effective tool for the management of B. tabaci populations from Crete, and initial studies indicate that it could be combined with B. tabaci natural enemies. © 2014 Society of Chemical Industry

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