> A LD50 of 0.00368 ug/bee is determined in tests in
> which bees are given
> sugar
> water spiked with test compound.  Each bee ingests
> approximately 20 uL of
> sugar
> water.

As far as I could understand, this kind of study
failed to protect non-targeted insects in Europe for
(at least) the following reasons:
1. This experience does not take into account
by-products of the initial molecule in nectar and
pollen. Those by-products are sometimes (often) more
toxic than the initial molecule.
2. This experiment only check acute toxicity. Hives
weakness or death occur even if foraging bees are not
exposed to the LD50 (acute toxicity) since larvae are
exposed to chronic toxicity via pollen at far higher
levels since they are in devlopment and have a far
lower mass than workers (like toxicity measured for
adult is different from toxicity for foetus). Thus
hives are more sensitive to disease and more often
fail in winter, if I understood well.

By the way, CDC realesed a study about pesticide in
Americans. See:
http://www.panna.org/campaigns/docsTrespass/chemicalTrespass2004.dv.html

Hervé






Yahoo! Mail : votre e-mail personnel et gratuit qui vous suit partout !
Créez votre Yahoo! Mail sur http://fr.benefits.yahoo.com/

Dialoguez en direct avec vos amis grâce à Yahoo! Messenger !Téléchargez Yahoo! Messenger sur http://fr.messenger.yahoo.com

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
-- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and  other info ---
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::