Re 2,4-D:  No experience myself, Bob.  Here's what Cornell has to say:

Brood production was severely impaired when honeybees were fed moderate
doses, but, at lower levels of exposure they lived significantly longer than
the controls. The honeybee LD50 is 11.5 micrograms/bee.

Although recently manufactured 2,4-D technical acids have consistently been
free of dioxin contamination, the amine and ester products may have
measurable levels of some forms of dioxin. According to a study of 2,4-D
manufactured in Canada
(9<http://pmep.cce.cornell.edu/profiles/extoxnet/24d-captan/24d-ext.html#9>),
of 26 amine samples tested, 8 were positive. The levels ranged from 5 ppb to
nearly 500 ppb. Several different forms of dioxin were present in the
different products. All but one of 21 ester samples were positive.
http://pmep.cce.cornell.edu/profiles/extoxnet/24d-captan/24d-ext.html

Randy Oliver

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