> Abnormal colony decline at the end of the season...

In a word, "Imidacloprid".

"Not Wanted" in multiple countries.

Often known to use one or more of
the following aliases:

        Admire
        Condifor
        Gaucho
        Impower
        Premier
        Premise
        Provado
        Marathon
        Merit
      (Also known by a wide variety of French curses
       untranslatable into English and unfit for a mixed crowd)

Armed and dangerous.
Approach with extreme caution.

Starring soon in a major class-action lawsuit at
a US courthouse at a yet-to-be disclosed location
in the Midwest.

But you already KNOW this, since the URL you
offered:
http://www.fundp.ac.be/~jvandyck/divbee/imida/beedecline.html

...clearly has "imida" in the URL.

So why are you asking us?  Are you trying to make sure that
nothing else could cause the symptoms you describe?

                jim

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