Systemic toxicity of spinosad to the greenhouse whiteflyTrialeurodes vaporariorum and to the cotton leaf wormSpodoptera littoralis |
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| Authors: | Thomas Van Leeuwen Marc Van de Veire Wannes Dermauw Luc Tirry |
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| Institution: | (1) Laboratory of Agrozoology, Faculty of Bio-Science Engineering, Ghent University, Coupure links 653, 9000 Ghent, Belgium |
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| Abstract: | When spinosad was administered at the stem base of tomato plants grown in rockwool, the main substrate used in greenhouses
in northern Europe, it was taken up by the roots and transported to the leaves. Laboratory toxicity experiments showed that
systemically applied spinosad, at doses as low as 2 mg active ingredient per plant, gave excellent control of nymphs of the
greenhouse whiteflyTrialeurodes vaporariorum, but was less toxic to adults. The toxicity of spinosad on Homoptera has not been documented yet and a dose-response relationship
was established. The persistence of toxicity was at least 22 days for whitefly nymphs. A dose-response relationship of systemically
applied spinosad was also determined on third-instar larvae of the cotton leaf wormSpodoptera littoralis; a dose of 5 mg per plant consistently killed all larvae. The persistence of systemically applied spinosad reached up to
45 days after treatment. Systemically applied spinosad was harmless to the parasitic waspEncarsia formosa.
http://www.phytoparasitica.org posting Nov. 29, 2005. |
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| Keywords: | Spinosad systemic toxicity Trialeurodes Spodoptera Encarsia |
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