Impacts of two conventional insecticides on different stages of Encarsia inaron Walker parasitizing the whitefly, Trialeurodes vaporariorum Westwood under greenhouse condition

• Published in: Archiv für Phytopathologie und Pflanzenschutz 2012-02, Vol.45 (3), p.268-275
• Main Authors: Hoseini, S. A, Pourmirza, A. A, Ebadollahi, A, Jahromi, M. Ghane
• Format: Article
• Language: English
• Subjects: adults; beans; bioassay; Encarsia; Encarsia inaron; greenhouses; imidacloprid; integrated pest management; mortality; parasitism; parasitoids; pupae; pyriproxyfen; Trialeurodes vaporariorum
• ISSN: 1477-2906; 0323-5408; 1477-2906
• DOI: 10.1080/03235408.2011.559043

In this research, for the first time, compatibility of imidacloprid and pyriproxyfen was assayed with both pupa and adult stages of Encarsia inaron Walker parasitizing Trialeurodes vaporariorum Westwood. First, the insecticides were sprayed on bean plants containing the parasitoid pupae, thenceforth, survival of the adult parasitoid was evaluated 24 h post-exposure to fresh, 1-, 4-, 7-, 14-, and 21-day-old residues of them on bean leaflets in Petri dishes. Both insecticides significantly reduce E. inaron adult emergence. Mortality of the parasitoid pupa in treatment with imidacloprid (69.7%) was significantly higher than mortality with pyriproxyfen (28.6%). Pyriproxyfen was non-toxic to the adult parasitoid when residues were dried in fresh and aged through the experiment, while in the same condition, imidacloprid significantly killed the adult parasitoids up to 7 days after application. Results have been discussed on the potential compatibility of the insecticides with E. inaron in an integrated pest management (IPM) approach.