Terry, nectar is sucrose just like sugar syrup and the bees do the same to both: Convert them to honey. Here in western WA, I provide most of my bees' overwintering honey by feeding them syrup. They start out taking it at a great rate but quickly slow way down and will take none after the frist week of October. Keep track of how much honey/syrup they store and when they have enough to overwinter on, stop feeding.
Of course, you don't want to extract the syrup/honey and treat it as if it was nectar/honey.
Incidentally, you can force swarms to self-retrieve by keeping a queen excluder under the hive bodies. See http://pub5.bravenet.com/forum/fetch.php?id=10022528&dir=1&usernum=411580919 Dan
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