’One suggestion that seems plausible to me is that screens may help

eliminate mites which show some resistance to acaricides and are only

stunned by the chemicals by getting them out of the hive.’



Although a bit dated (2001) this study supports that suggestion.

http://www.ent.uga.edu/bees/publications/ABJ.pdf



‘Apistan provided 100% control in South Carolina whereas in Georgia it
provided 0% control in colonies treated exclusively with Apistan. In the
presence of a bottom screen Apistan-treated colonies in Georgia experienced
an average mite control of 44.3%.’



‘Additionally, our data suggests that screened bottoms can enhance varroa
mite control in colonies with chemical resistant mites’

-- 
*Dan Harris*

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