> Then why didn't we see them in the 70's. We were in Maine with a huge Goldenrod flow several years. 

This is from 1977:

> A six-year study of natural swarming in Ithaca, NY, USA, showed a bimodal distribution for date of swarm emergence, with a peak during the first two weeks in June and a lesser peak during the last week in August and the first week in September. 

> As first noted by Burgett and Morse (1974), a well defined non-swarming period existed between mid-July and mid- August. The one swarm collected during this period was from a feral colony.

The Seasonal Cycle of Swarming in Honeybees
Richard D. Fell, John T. Ambrose, D. Michael Burgett, David De Jong, Roger A. Morse & Thomas D. Seeley
Journal of Apicultural Research Vol. 16 , Iss. 4, 1977

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