I use those danged green frames for drone production and varroa management.
Instead of freezing the frames and returning them to the hive later, I use a
hand tool to scrape the drone larvae out so the frame can be rinsed and
immediately returned to the hive.   Finding "hot spots" of varroa
infestation is very common within the scraped down brood.  These spots are
generally 2-4 inches (5-10 cm) in diameter.

On Sat, Jun 5, 2010 at 10:05 AM, randy oliver <[log in to unmask]> wrote:

> >Let me add that I am surprisewd to find that the drone brood in on part of
> the hive can be loaded with multiple varroa and drone brood in another part
> can be quite free of varroa.
>

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