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Medientyp: E-Artikel Titel: Susceptibility to insecticides in the Q biotype of Bemisia tabaci is correlated with bacterial symbiont densities Beteiligte: Ghanim, Murad; Kontsedalov, Svetlana Erschienen: Wiley, 2009 Erschienen in: Pest Management Science Sprache: Englisch DOI: 10.1002/ps.1795 ISSN: 1526-498X; 1526-4998 Entstehung: Anmerkungen: Beschreibung: <jats:title>Abstract</jats:title><jats:p><jats:bold>BACKGROUND:</jats:bold> The presence of symbiotic microorganisms may influence an insect's ability to tolerate natural and artificial stress agents such as insecticides. The authors have previously shown that <jats:italic>Rickettsia</jats:italic> in the B biotype of the whitefly <jats:italic>Bemisia tabaci</jats:italic> (Gennadius) (Homoptera: Aleyrodidae) increases this insect's susceptibility to several insecticidal compounds. This communication reports a comparison of the susceptibilities of three isofemale strains of the Q biotype of <jats:italic>B. tabaci</jats:italic> harbouring different bacterial complements to major insecticides from different chemical groups: one strain harboured only <jats:italic>Arsenophonus</jats:italic>, one harboured <jats:italic>Rickettsia</jats:italic> and <jats:italic>Arsenophonus</jats:italic> and one harboured <jats:italic>Arsenophonus</jats:italic> and <jats:italic>Wolbachia</jats:italic>.</jats:p><jats:p><jats:bold>RESULTS:</jats:bold> The presence of different symbiont combinations in the three strains had a significant influence on their susceptibility to most of the insecticides tested. Thiamethoxam, imidacloprid, pyriproxyfen and spiromesifen had a significant influence on strains that had the double infections <jats:italic>Rickettsia</jats:italic>–<jats:italic>Arsenophonus</jats:italic> and <jats:italic>Wolbachia–Arsenophonus</jats:italic>, which also carried higher amounts of symbionts as assessed by quantitative real‐time PCR. No significant differences in mortality rates were observed when the tested strains were treated with diafenthiuron.</jats:p><jats:p><jats:bold>CONCLUSION:</jats:bold> The results suggest a correlation between the presence of high bacterial densities in <jats:italic>B. tabaci</jats:italic> and the insect's ability to detoxify toxic compounds such as insecticides. Copyright © 2009 Society of Chemical Industry</jats:p>