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Subject:	Re: Nosema is widespread and often detected in healthy colonies
From:	Peter Loring Borst <[log in to unmask]>
Reply To:	Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
Date:	Wed, 22 Jul 2015 19:56:44 -0400
Content-Type:	text/plain
Parts/Attachments:	text/plain (21 lines)

>  What do nosema counts of .05 million, 1.7 million. and .2 million mean?  Are these serious infections?

According to Traver and Fell:

> While N. ceranae is a less prolific spore producer than N. apis, estimating 1 million spores per bee sample is a good threshold value to use when considering the need for colony treatment.

At the same time they say:

> Reliable threshold levels for N. ceranae treatment are still unknown.

Finally:

> Colony mortality due to N. ceranae infections does not appear to be a major factor in colony losses throughout the mid-Atlantic region. We do not feel that N. ceranae is a major factor associated with colony decline.

http://pubs.ext.vt.edu/ENTO/ENTO-66/ENTO-66-pdf.pdf

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