>So far as I know, phosphine is a legal way of controlling pests in stored combs.

According to the applicators manual, it's legal with this restriction "Honey from treated hives or supers may only be used for bee food"  I'm not sure what that actually means but one interpretation could be that once supers are treated they can no longer be used to produce honey for human consumption. 


"Beehives, Supers and Other Bee Keeping Equipment
Develop an appropriate Fumigation Management Plan. Tablets and pellets of this product may be used for the control of the Greater Wax Moth in stored beehives, supers, and other bee keeping equipment and for the destruction of bees, Africanized bees, and diseased bees including those infested with tracheal mites and foulbrood. The dosage for this use is 30 to 45 tablets or 150 to 225 pellets per 1000 cubic feet. Fumigations may be performed in chambers at atmospheric pressure, under tarpaulins, etc., by placing the tablets or pellets on trays or in moisture permeable envelopes. Do not add more than 2 tablets or 10 pellets to each envelope. Honey from treated hives or supers may only be used for bee food."

Page 24, Applicators manual 

www.greatplainschemicals.com/_literature_157559/PH3_Booklet_-_Label

Bill Hesbach
Cheshire CT

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