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Wed, 17 May 2023 14:24:06 -0500 |
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>The problem is, at least in my experience, winter one tells me nothing about untreated wild swarms.
On balance I concur. From the referenced paper we read that the results are a summary of three years of evaluation with the following to report (referenced tables attached):
‘I have little doubt that the ca. 30% mortality of colonies shown in Table 1 is a result of high populations of Varroa (and ensuing damage from viruses) in some of the colonies. I say this because I have found that in these untreated colonies, the mite level in a colony in September is a very good predictor of whether this colony will be dead (or alive) the following April.
For example, on 18 Sept 2018, I measured the mite loads (mites/300 bees, powdered sugar test) of the 17 colonies in the Ellis Hollow apiary, and on 25 April 2019, I inspected these colonies to see which had died. The results, shown in Table 2, show that there was great variation among the colonies in their mite loads in September 2018, and that this variation was tightly associated with which colonies were dead or alive in April 2019.’
While anecdotal, there seems to be correlation around +/- 70% survival of resistant stock in more Northern latitudes (This is Kirk Webster’s 20+ year average) with increased survival the further South one goes.
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