This is what Ellis, Hayes, and Ellis had to say:

> Despite the anecdotal support given for small cell foundation and some positive data suggesting that cell size might play a role in varroa choice (Message and Goncalves 1995; Piccirillo and De Jong 2003), we found no evidence that it was an efficacious 
control under the tested conditions in Florida ... we cannot recommend its use as a tool in an integrated pest management program aimed at controlling varroa.

Exp Appl Acarol (2009) 47:311–316

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