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1 October 2011 Lethal and Sublethal Toxicity of Fipronil and Imidacloprid on Psyttalia concolor (Hymenoptera: Braconidae)
Ángeles Adán, Elisa Viñuela, Paloma Bengochea, Flor Budia, Pedro Del Estal, Pedro Aguado, Pilar Medina
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Abstract

Psyttalia concolor (Szèpligeti) (Hymenoptera: Braconidae) is a koinobiont endoparasitoid of several species of tephritid (Diptera) larvae, such as Bactrocera oleae (Gmelin) and Ceratitis capitata (Wiedemann). Here, we report on the effects of imidacloprid and fipronil on P. concolor females, when different routes of exposure were evaluated: residual contact (cover and bait sprays) and via treatment of host species. Moreover, the persistence of the bait formulated compound also was studied. For each experiment, lethal (mortality) and sublethal effects (parasitization rate or longevity) were studied. Fipronil produced 100% mortality irrespective of exposure route, and it was very persistent, because 34-d-old residues still produced this high mortality rate, being as toxic or even more toxic than the reference product dimethoate. Toxicity of imidacloprid depends on the mode of exposure, although always remained less toxic than dimethoate. Imidacloprid caused high mortality or sublethal effect to the progeny in cover sprays and when applied via treated host, being harmless in bait sprays application. In conclusion, our results suggest that fipronil should not be used in the field when the parasitoid is present. On the contrary, although imidacloprid is physiologically active against females of P. concolor, ecological selectivity may result through the use of bait treatment.

© 2011 Entomological Society of America
Ángeles Adán, Elisa Viñuela, Paloma Bengochea, Flor Budia, Pedro Del Estal, Pedro Aguado, and Pilar Medina "Lethal and Sublethal Toxicity of Fipronil and Imidacloprid on Psyttalia concolor (Hymenoptera: Braconidae)," Journal of Economic Entomology 104(5), 1541-1549, (1 October 2011). https://doi.org/10.1603/EC11019
Received: 20 January 2011; Accepted: 1 June 2011; Published: 1 October 2011
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KEYWORDS
fipronil
imidacloprid
Psyttalia concolor
side effects
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