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Pesquisa Agropecuária Brasileira

Print version ISSN 0100-204XOn-line version ISSN 1678-3921

Abstract

MOURA, MARCELO FIALHO DE; PICANCO, MARCELO; GONRING, ALFREDO HENRIQUE ROCHA  and  BRUCKNER, CLÁUDIO HORST. Selectivity of insecticides to three Vespidae predators of Dione juno juno (Lepidoptera: Heliconidae). Pesq. agropec. bras. [online]. 2000, vol.35, n.2, pp.251-257. ISSN 0100-204X.  http://dx.doi.org/10.1590/S0100-204X2000000200003.

Among insects that attack passion fruit, Dione juno juno (Lepidoptera: Heliconidae) is considered the most dangerous plague. The selectivity of the insecticides fenthion, cartap, malathion and deltamethrin to the predatory wasps Polybia fastidiosuscula, Polybia scutellaris and Protonectarina sylveirae (Hymenoptera: Vespidae) was studied based on these insecticide toxicities to their prey Dione juno juno. Concentration-mortality regression lines were obtained and the estimated lethal concentration of insecticide to 90% (LC90) of the individuals were used for the calculation of the differential selectivity index and tolerance index. Deltamethrin was selective in favor of P. scutellaris and P. fastidiosuscula and showed intermediate selectivity to P. sylveirae, while cartap showed intermediate selectivity to all three species of predatory wasps. Malathion was selectivite to P. sylveirae and showed intermediate selectivity to P. fastidiosuscula. The predatory wasps P. sylveirae and P. fastidiosuscula were more tolerant to cartap than P. scutellaris and P. sylveirae was more tolerant to malathion than P. fastidiosuscula and P. scutellaris.

Keywords : Passion fruit; Passiflora edulis f. flavicarpa; passion fruit caterpillar; Polybia fastidiosuscula; Polybia scutellaris; Protonectarina sylveirae.

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