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Date: | Sun, 2 May 2021 15:39:09 -0600 |
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One location, more or less one approach over five winters, in a fairly
harsh climate, high desert, 7566 feet above sea level, almost at the
38th parallel, lows for the years recorded at the nearest official
station between 0 and -11 Fahrenheit. The lows at the apiary are
likely 10 to 15 degrees lower because of the thermal inversion
affecting the lower area of the valley (200 feet lower than the weather
station).
A total of 30 overwintering attempts over the five years, with mites
washed and bees counted in samples taken from brood areas in the late
summer or fall from most of the colonies. Colonies that survived: 25,
with mites per hundred bees ranging from 0 to 3.1. Colonies that died:
5, with mite numbers unknown or ranging from 0 to 38 (yes, as in 38
mites to 100 bees). We tried to bring mite numbers down in that colony
and its sister (at 19 mites per 100 bees). They went down but not
early or well enough.
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