The suggestion not to feed during treatment is based on trending and observation, not research.  Hives struggling when treated under conditions of nutritional stress is a phenomenon we observed in France after the lavender flow and we don't want the treatment to be blamed for what are nutritional issues.  So we advise, as a general best management practice, to ensure the nutritional element of animal husbandry is addressed before treatment.  It makes sense if you think of the 'feed before treatment' direction with any other livestock or pets: starving animals subjected to any additional stress will have more trouble handling it than well fed animals.  
Regarding feeding syrup during treatment, open source feeding (barrel feeding) is ok as it's just like a honey flow.  However, in-hive feeding has led to observed queen issues in our bees so we know to advise against it.  This was true with hive top feeders.  The entrance reduction issues are well understood and dealt with elsewhere on the label.  To keep things simple on the label, rather than discuss various feeding methods, we just went with the blanket statement.  Hope this helps.  Great question!

 
Wendy Mather 
Bee Health Advisor 
NOD Apiary Products Ltd. 
U.S.A. Office 
t.  1 916-850-9871 
w. www.nodglobal.com

Healthy Bees. Healthy Planet. 
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--------- Original Message --------- Subject: Re: [BEE-L] MAQS and feeding
From: "Adam Ritchie" <[log in to unmask]>
Date: 9/19/15 3:48 am
To: [log in to unmask]

I treated with MAQS and fed a yard of singles at the same last year due to time constraints. I found that only the very strongest singles will go up past the strips to a top feeder. I then found that even after the treatment pads were removed they didn't want to go up into the feeders. It seemed like they had created a lasting association between the feed/feeders and the MAQS.
 
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