Robert Rice asked a few days ago if anyone had more info on gregarines causing
bee disease. Since no one responded, I'll try to recall a report of a couple of
years ago, from Bill Wilson at Weslaco Texas, USDA, of gregarines associated
with unusually high colony mortality in the south U.S. I think there was no
definite causal link, but it might be interesting for you to compare
observations.
Morse and Nowogrodski have a 2 page discussion indicating gregarines in bees are
widespread (except where it freezes) but rarely identified, usually considered
commensals but sometimes considered pathogenic, and have been controlled with
fumagillin.
 
Kerry Clark, Apiculture Specialist
B.C. Ministry of Agriculture
1201 103 Ave
Dawson Creek B.C.
        V1G 4J2  CANADA          Tel (604) 784-2225     fax (604) 784-2299
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