> My question is, are the earlier stages more resistant to chilling ? As I
> have never seen early brood being carried out.
 
I believe Steve Taber claims that young larvae and eggs are not very
temperature sensitive.
 
As I recall, he said that if wrapped in damp towel, a frame containing
both can be placed in a refrigerator overnight and still be viable in the
morning.
 
His contention was that only a few moments of UV exposure (direct
sunlight), or dehydration (wind) will kill them, and we call it
'chilling'.
 
FWIW.
 
 
Allen Dick                                  VE6CFK
Rural Route One, Swalwell, Alberta  Canada T0M 1Y0
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